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Dr. Didier Orange
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Preprint content
Published: 04 March 2021
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Vegetation strongly affects the water cycle, and the interactions between vegetation and soil moisture are fundamental for ecological processes in semiarid regions. Therefore, characterizing the variation in soil moisture is important to understand the ecological sustainability of cropping systems towards food security. The present study aims at exploring factors and mechanisms influencing soil moisture variability in the Faidherbia albida (FA) parkland at Sob basin located in the center of Senegal [1]. Volumetric soil moisture content at multiple depths was monitored at 15 locations distributed along a transect (upper slope, mid-slope and lower slope) and different FA tree position (under, at the limit and outside canopy) from August to October 2020. A portable TRIME Time Domain Reflectometry (TDR) Tube Probe (IMKO, Germany) was used to determine soil volumetric moisture content while being placed at specific depth intervals inside a PVC access tube set up at each location. Soil moisture was monitored at 10 cm interval from 20 to 420 cm during the rainy season from July to October 2020. Results of soil moisture profiles along the transects exhibit two main zones based on the standard deviation (SD) and the inflection of the coefficient of variation (CV): shallow soil moisture (SSM) and deep soil moisture (DSM). For SSM observed at 20-60 cm of the soil layer, both mean soil moisture and SD increase with depth, the lowest mean value (8%) being observed at the top surface. This soil layer is influenced by rainfall infiltration and daily evaporation. For DSM observed at 70-420 cm, the moisture pattern can be further divided into 4 soil sublayers taking the mean soil moisture vertical distribution as reference: (i) a rainfall infiltration layer (70-160 cm) which appears mainly influenced by cumulative rainfall infiltration in addition to transpiration of grassland and crops (shallow root system); (ii) a rainfall-transpiration layer (170-250 cm) which is still an infiltration layer but more influenced by crops transpiration; (iii) a transpiration layer (260-350 cm) which can be recharged by rainfall infiltration during heavy rainfall and supply deep root system; and (iv) deep transpiration layer (360-400 cm) which has DSM that can be influenced by extremely deep root vegetation such as FA. The factors influencing the soil water content varied with the topography. The soil water content SWC (mean and median value of 27.2 and 29.6% respectively) in the lower slope was significantly higher than that at middle (mean and median value of 14.4 and 13.2 % respectively) and upper slope (mean and median value of 16.8 and 18.4 % respectively). At last, soil water content was positively correlated with the distance from the FA, regardless the slope. The higher water content for both SSM and DSM was observed outside the FA canopy. This result refutes the initial hypothesis of higher SWC under trees and support a more detailed analysis of the infiltration capacity in relationship with the FA position.

[1] Faidherbia-Flux : https://lped.info/wikiObsSN/?Faidherbia-Flux

ACS Style

Djim Diongue; Didier Orange; Waly Faye; Olivier Roupsard; Frederic Do; Christophe Jourdan; Christine Stumpp; Awa Niang Fall; Serigne Faye. Influence of trees and topography on soil water content in semi-arid region, the case of an agro-silvo-pastoral ecosystem dominated by Faidherbia albida (Senegal). 2021, 1 .

AMA Style

Djim Diongue, Didier Orange, Waly Faye, Olivier Roupsard, Frederic Do, Christophe Jourdan, Christine Stumpp, Awa Niang Fall, Serigne Faye. Influence of trees and topography on soil water content in semi-arid region, the case of an agro-silvo-pastoral ecosystem dominated by Faidherbia albida (Senegal). . 2021; ():1.

Chicago/Turabian Style

Djim Diongue; Didier Orange; Waly Faye; Olivier Roupsard; Frederic Do; Christophe Jourdan; Christine Stumpp; Awa Niang Fall; Serigne Faye. 2021. "Influence of trees and topography on soil water content in semi-arid region, the case of an agro-silvo-pastoral ecosystem dominated by Faidherbia albida (Senegal)." , no. : 1.

Preprint content
Published: 04 March 2021
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The soil hydraulic properties controlling infiltration are dynamic depending on interrelated factors such as soil texture and structure, climate (rainfall intensity), land use, vegetation cover and plant root systems. These physical and biological factors directly influence the size and geometry of the conductive pores, and therefore the bulk density, soil structure and finally water infiltration at surface. In the Sahelian zone, the slightest modification of the physical properties of the soil has severe consequences on the soil properties and thus on hydrological processes. It is therefore essential to improve knowledge on the spatial distribution of the hydraulic behavior of soils for optimization of agricultural uses.

We used the BEST method (Beerkan Estimation of Soil Transfer parameters) on a toposequence of the Senegalese groundnut basin (Fatick region) in the Faidherbia-Flux observatory[1] where the average rainfall is 590 mm/yr. The studied toposequence (400 m long) is representative of a common agroforestry zone with annual cultivation of millet and peanuts and a sparse density of Faidherbia albida. The slope is low (1%) with small lowland areas made up of sandy soil with more clay (clay soil), while the glacis is represented by more or less compacted sand. The infiltrometry measurements were made with the automatic single-ring infiltrometer developed by Di Prima et al. (2016), used here for the first time in West Africa. The explicative variables tested are the type of soils, including: clay soils under tree (CLUT) and outside tree (CLOT), sandy soils under tree (SSUT) and outside trees (SSOT), and cattle trampled soils outside trees (TSOT) particularly compacted and largely present in the study area. BEST algorithms were applied to the experimental data to determine the hydraulic properties of the soils of the different variables and to draw water retention and hydraulic conductivity curves.

There are significant differences in infiltration rates between the sampled zones and in relation with the studied factors. The highest infiltration rate is found on sandy soils under tree (SSUT) with an average infiltration rate of 14.0 mm/min, followed by SSOT with 11.6 mm/min. Then the clay soils CLUT and CLOT are characterized by similar lower hydraulic responses with average infiltration rates of 6.9 mm/min and 6.2 mm/min, respectively. The average infiltration rate is the lowest on the compacted sandy soils TSOT, with only 5.4 mm/min. The study of the variability of the infiltration rates measured by class of variable shows a large variability for CLOT, CLUT and SSUT (decreasing order of variability). These results are in agreement with the measured values of dry soil bulk density. The high infiltration rates in the clay soils outside and under trees can be explained by the higher content of organic matter observed on the sampling, and probably by the existence of preferential flow activated by the macropores particularly present on clay soils (CLOT and CLUT) and on sandy soils under tree (SSUT).

Di Prima, S., et al., 2016. Testing a new automated single ring infiltrometer for Beerkan infiltration experiments. Geoderma, 262, 20–34. doi:10.1016/j.geoderma.2015.08.006

[1] Faidherbia-Flux : https://lped.info/wikiObsSN/?Faidherbia-Flux

 

ACS Style

Waly Faye; Didier Orange; Djim Mouhamadou Lamine Diongue; Frederic Do; Christophe Jourdan; Olivier Roupsard; Awa Niang Fall; Alioune Kane; Sérigne Faye; Simone Di Prima; Rafaele Angulo-Jaramillo; Laurent Lassabatère. Potential impact of Faidherbia albida tree on soil infiltration in a semi-arid agroforestry system of the Senegalese groundnut basin: role of preferential flows? . 2021, 1 .

AMA Style

Waly Faye, Didier Orange, Djim Mouhamadou Lamine Diongue, Frederic Do, Christophe Jourdan, Olivier Roupsard, Awa Niang Fall, Alioune Kane, Sérigne Faye, Simone Di Prima, Rafaele Angulo-Jaramillo, Laurent Lassabatère. Potential impact of Faidherbia albida tree on soil infiltration in a semi-arid agroforestry system of the Senegalese groundnut basin: role of preferential flows? . . 2021; ():1.

Chicago/Turabian Style

Waly Faye; Didier Orange; Djim Mouhamadou Lamine Diongue; Frederic Do; Christophe Jourdan; Olivier Roupsard; Awa Niang Fall; Alioune Kane; Sérigne Faye; Simone Di Prima; Rafaele Angulo-Jaramillo; Laurent Lassabatère. 2021. "Potential impact of Faidherbia albida tree on soil infiltration in a semi-arid agroforestry system of the Senegalese groundnut basin: role of preferential flows? ." , no. : 1.

Article
Published: 04 January 2021
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The rainfall reduction in the 1970s, less marked in Central Africa than in West Africa, still had a major impact on the hydrological regimes of the region's large rivers. The study of the hydropluviometric behavior of the Ubangi at Mobaye has the advantage of studying a basin excluding anthropogenic impact. Forest cover and population density have not changed since at least 1970. Statistical analysis of the breaks in the long rainfall time series from Ubangi at Mobaye (1935-2015) confirms a long period of drought from 1969 to 2006 corresponding to a reduction of -8% in rainfall. And the study of the corresponding hydrological series indicates a second downward break in 1981, few years after the rainfall increase. This period points an exceptional hydrological drought period until 2013, which is the first year with an increase of flows. The statistical study of the annual rainfall/flow series of the upstream basins over the period 1951-1995 (the Kotto at Kembé and Bria, the Mbomu at Bangassou and Zémio, the Uélé + Bili hydrographic system) highlights different hydrological behaviors related to the vegetation cover. The savanna basins show a continuous hydrological deficit marked by a runoff coefficient (CE) that fell to 5% only from the 1990s. On the other hand, the basins under forest show a runoff increase since 1990 marked by CE above 10%. Under savannah, the part of the flow infiltrating to recharge the aquifer would have decreased faster than under forest, which results in a runoff coefficient CE very significantly negatively correlated with the savanna area present in the studied watershed.

ACS Style

Didier Orange. Dynamique hydroclimatique de l’Oubangui amont à Mobaye, République Centrafricaine : étude comparée du rôle de la savane et de la forêt équatoriale. 2021, 1 .

AMA Style

Didier Orange. Dynamique hydroclimatique de l’Oubangui amont à Mobaye, République Centrafricaine : étude comparée du rôle de la savane et de la forêt équatoriale. . 2021; ():1.

Chicago/Turabian Style

Didier Orange. 2021. "Dynamique hydroclimatique de l’Oubangui amont à Mobaye, République Centrafricaine : étude comparée du rôle de la savane et de la forêt équatoriale." , no. : 1.

Journal article
Published: 25 November 2020 in Significances of Bioengineering & Biosciences
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Orange Didier* IRD, Research Unit “Functional Ecology and Biochemistry of Soils”, University of Montpellier, IRD, INRAe, Cirad, SupAgro-Montpellier, France *Corresponding author: Orange Didier, IRD, Research Unit “Functional Ecology and Biochemistry of Soils”, University of Montpellier, IRD, INRAe, Cirad, SupAgro-Montpellier, France, Email: [email protected] Submission: November 17, 2020 Published: November 25, 2020 DOI: 10.31031/SBB.2020.04.000581 ISSN 2637-8078Volume4 Issue2 In a world in constant and rapid changes, it becomes urgent that research activities adopt new methodologies to develop technological innovations allowing rapid adaptations by the policy-makers and the smallholders in respect to the environment. Nature-based solutions (NBS) and problem-solving learning (PSL) ensure active participation from the actors. By this way ecohydrology within bioengineering, bioinspiration, ecological engineering offers new opportunities for scientific activities on organic matter (OM) management to pass achievements to policy makers and the public through more active developments in social media. Then better competencies on OM management will create opportunities for technological innovations and paradigm shifts to make possible and efficient an economic and ecological asset for green production, promoting food and health security for the populations and for a sustainable environment. As more and more well known, the stationarity is dead. The Earth is a non-linear complex system. Recent discoveries on the importance of living things and their environmental feedbacks, on the role of homeostatic processes and breakpoints confirm that global warming is only part of the current ecological crisis which is also manifested by the loss of biodiversity, the loss of soil fertility, the water pollution but also the drastic increase in diseases that affect the entire living world. The current COVID-19 pandemic is just one more dramatic example. In 2020, the management of domestic wastewater remains a major global challenge, as well as feeding the poorest populations, stopping the soil losses through the galloping urbanization and mitigating the environmental quality of our cities. 2/3 of the world's population still does not have access to sanitation, creating recurrent health and environmental disasters. The majority of them are in tropical regions, mainly in Sub-Saharan Africa, in countries whose economy does not allow the rapid development of wastewater treatment plants. It is therefore necessary to innovate and change the wastewater management model. Like international institutions (UNESCO, USAID, AFD, FFEM, etc.) and the pursuit of the SDGs for the Horizon 2030, the Research arena is highly challenged to develop technological innovations allowing changes in concepts regarding the perception of the usefulness of wastewater for green production. Domestic wastewater represents a volume of water loaded with organic matter useful for plant production (natural and agricultural), for the rational and amplified use of water and soil (maintenance of fertility, carbon storage) and for improvement of the living conditions of the populations while fully respecting their health, their environment, the soils, the waters and the biodiversity. The innovation opportunities are numerous, from process engineering to ecological engineering and bioengineering, from biogeochemist and microbiologist to creator of IoT and AI algorithm, from architect and urban planner to geographer. Then it is obvious than a better use of the residual organic matters in respect of soils, waters and local climate will help to improve the food production, the human and environmental health, the water and nutrient efficiency, the short cycles for resources consumption and local economy. The spatial analysis of human pressure on natural resources and of the required ecosystem services according to a systemic approach of the ecosystems makes possible to understand cause-and-effect relationships through the hydrological logic along the watershed. The understanding of the water flow pathways and the associated dissolved and suspended matter fluxes drives to optimize the position of nature-based eco-engineering solutions. Based on the management of all the liquid and solid fluxes inside the watershed, the ecohydrological approach promotes to restore and often to amplify the key ecosystem functions in regards of the human uses and needs. The purpose of this approach concerning the integrated management of ecosystem services at watershed scale is to organize and to optimize the use of ecosystem services along the surface flows according to their nature and in order the principle of dual regulation between biocenoses and fluxes. It could be by increasing the reactive surfaces of biocenoses and/or reducing biodegradable flows through upstream actions on water and matter fluxes in the streams, or by using their seasonal variability to put in action cascades of bioreactions. This approach involves to reserve some specific areas such as biogeochemical reactors and bioengineering actions, at key points to ensure the requested ecosystem services at the right times and in the right places matching with the people users. The scientific output is to perform some scenarios of structuring points of the studied landscapes and infrastructures to promote a sustainable water management regarding the environment, the economy and the social wellbeing. Special points should face to the specific properties of seasonal and intermittent flows (surface flows, groundwaters, lateral flows), of interannual flows, related to rainfall and evapotranspiration framework, crossing the human use and the natural demand. It is clear that urban and rural areas have the same importance, and it will be a great advantage to be able to consider both in a complementary vision. In this context, significant challenges of scientific fields appear to be...

ACS Style

Orange Didier. Towards a Sustainable Green World? A Better use of OM. Significances of Bioengineering & Biosciences 2020, 4, 1 -2.

AMA Style

Orange Didier. Towards a Sustainable Green World? A Better use of OM. Significances of Bioengineering & Biosciences. 2020; 4 (2):1-2.

Chicago/Turabian Style

Orange Didier. 2020. "Towards a Sustainable Green World? A Better use of OM." Significances of Bioengineering & Biosciences 4, no. 2: 1-2.

Journal article
Published: 22 October 2020 in Water
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A large share of surface water resources in Sahelian countries originates from Guinea’s Fouta Djallon highlands, earning the area the name of “the water tower of West Africa”. This paper aims to investigate the recent dynamics of the Fouta Djallon’s hydrological functioning. The evolution of the runoff and depletion coefficients are analyzed as well as their correlations with the rainfall and vegetation cover. The latter is described at three different space scales and with different methods. Twenty-five years after the end of the 1968–1993 major drought, annual discharges continue to slowly increase, nearly reaching a long-term average, as natural reservoirs which emptied to sustain streamflows during the drought have been replenishing since the 1990s, explaining the slow increase in discharges. However, another important trend has been detected since the beginning of the drought, i.e., the increase in the depletion coefficient of most of the Fouta Djallon upper basins, as a consequence of the reduction in the soil water-holding capacity. After confirming the pertinence and significance of this increase and subsequent decrease in the depletion coefficient, this paper identifies the factors possibly linked with the basins’ storage capacity trends. The densely populated areas of the summit plateau are also shown to be the ones where vegetation cover is not threatened and where ecological intensification of rural activities is ancient.

ACS Style

Luc Descroix; Bakary Faty; Sylvie Paméla Manga; Ange Bouramanding Diedhiou; Laurent A. Lambert; Safietou Soumaré; Julien Andrieu; Andrew Ogilvie; Ababacar Fall; Gil Mahé; Fatoumata Binta Sombily Diallo; Amirou Diallo; Kadiatou Diallo; Jean Albergel; Bachir Alkali Tanimoun; Ilia Amadou; Jean-Claude Bader; Aliou Barry; Ansoumana Bodian; Yves Boulvert; Nadine Braquet; Jean-Louis Couture; Honoré Dacosta; Gwenaelle Dejacquelot; Mahamadou Diakité; Kourahoye Diallo; Eugenia Gallese; Luc Ferry; Lamine Konaté; Bernadette Nka Nnomo; Jean-Claude Olivry; Didier Orange; Yaya Sakho; Saly Sambou; Jean-Pierre Vandervaere. Are the Fouta Djallon Highlands Still the Water Tower of West Africa? Water 2020, 12, 2968 .

AMA Style

Luc Descroix, Bakary Faty, Sylvie Paméla Manga, Ange Bouramanding Diedhiou, Laurent A. Lambert, Safietou Soumaré, Julien Andrieu, Andrew Ogilvie, Ababacar Fall, Gil Mahé, Fatoumata Binta Sombily Diallo, Amirou Diallo, Kadiatou Diallo, Jean Albergel, Bachir Alkali Tanimoun, Ilia Amadou, Jean-Claude Bader, Aliou Barry, Ansoumana Bodian, Yves Boulvert, Nadine Braquet, Jean-Louis Couture, Honoré Dacosta, Gwenaelle Dejacquelot, Mahamadou Diakité, Kourahoye Diallo, Eugenia Gallese, Luc Ferry, Lamine Konaté, Bernadette Nka Nnomo, Jean-Claude Olivry, Didier Orange, Yaya Sakho, Saly Sambou, Jean-Pierre Vandervaere. Are the Fouta Djallon Highlands Still the Water Tower of West Africa? Water. 2020; 12 (11):2968.

Chicago/Turabian Style

Luc Descroix; Bakary Faty; Sylvie Paméla Manga; Ange Bouramanding Diedhiou; Laurent A. Lambert; Safietou Soumaré; Julien Andrieu; Andrew Ogilvie; Ababacar Fall; Gil Mahé; Fatoumata Binta Sombily Diallo; Amirou Diallo; Kadiatou Diallo; Jean Albergel; Bachir Alkali Tanimoun; Ilia Amadou; Jean-Claude Bader; Aliou Barry; Ansoumana Bodian; Yves Boulvert; Nadine Braquet; Jean-Louis Couture; Honoré Dacosta; Gwenaelle Dejacquelot; Mahamadou Diakité; Kourahoye Diallo; Eugenia Gallese; Luc Ferry; Lamine Konaté; Bernadette Nka Nnomo; Jean-Claude Olivry; Didier Orange; Yaya Sakho; Saly Sambou; Jean-Pierre Vandervaere. 2020. "Are the Fouta Djallon Highlands Still the Water Tower of West Africa?" Water 12, no. 11: 2968.

Review
Published: 18 September 2020 in Water
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Although the Congo Basin is still one of the least studied river basins in the world, this paper attempts to provide a multidisciplinary but non-exhaustive synthesis on the general hydrology of the Congo River by highlighting some points of interest and some particular results obtained over a century of surveys and scientific studies. The Congo River is especially marked by its hydrological regularity only interrupted by the wet decade of 1960, which is its major anomaly over nearly 120 years of daily observations. Its interannual flow is 40,500 m3 s−1. This great flow regularity should not hide important spatial variations. As an example, we can cite the Ubangi basin, which is the most northern and the most affected by a reduction in flow, which has been a cause for concern since 1970 and constitutes a serious hindrance for river navigation. With regard to material fluxes, nearly 88 × 106 tonnes of material are exported annually from the Congo Basin to the Atlantic Ocean, composed of 33.6 × 106 tonnes of TSS, 38.1 × 106 tonnes of TDS and 16.2 × 106 tonnes of DOC. In this ancient flat basin, the absence of mountains chains and the extent of its coverage by dense rainforest explains that chemical weathering (10.6 t km−2 year−1 of TDS) slightly predominates physical erosion (9.3 t km−2 year−1 of TSS), followed by organic production (4.5 t km−2 year−1 of DOC). As the interannual mean discharges are similar, it can be assumed that these interannual averages of material fluxes, calculated over the longest period (2006–2017) of monthly monitoring of its sedimentology and bio-physical-chemistry, are therefore representative of the flow record available since 1902 (with the exception of the wet decade of 1960). Spatial heterogeneity within the Congo Basin has made it possible to establish an original hydrological classification of right bank tributaries, which takes into account vegetation cover and lithology to explain their hydrological regimes. Those of the Batéké plateau present a hydroclimatic paradox with hydrological regimes that are among the most stable on the planet, but also with some of the most pristine waters as a result of the intense drainage of an immense sandy-sandstone aquifer. This aquifer contributes to the regularity of the Congo River flows, as does the buffer role of the mysterious “Cuvette Centrale”. As the study of this last one sector can only be done indirectly, this paper presents its first hydrological regime calculated by inter-gauging station water balance. Without neglecting the indispensable in situ work, the contributions of remote sensing and numerical modelling should be increasingly used to try to circumvent the dramatic lack of field data that persists in this basin.

ACS Style

Alain Laraque; Guy D. Moukandi N’Kaya; Didier Orange; Raphael Tshimanga; Jean Marie Tshitenge; Gil Mahé; Cyriaque R. Nguimalet; Mark A. Trigg; Santiago Yepez; Georges Gulemvuga. Recent Budget of Hydroclimatology and Hydrosedimentology of the Congo River in Central Africa. Water 2020, 12, 2613 .

AMA Style

Alain Laraque, Guy D. Moukandi N’Kaya, Didier Orange, Raphael Tshimanga, Jean Marie Tshitenge, Gil Mahé, Cyriaque R. Nguimalet, Mark A. Trigg, Santiago Yepez, Georges Gulemvuga. Recent Budget of Hydroclimatology and Hydrosedimentology of the Congo River in Central Africa. Water. 2020; 12 (9):2613.

Chicago/Turabian Style

Alain Laraque; Guy D. Moukandi N’Kaya; Didier Orange; Raphael Tshimanga; Jean Marie Tshitenge; Gil Mahé; Cyriaque R. Nguimalet; Mark A. Trigg; Santiago Yepez; Georges Gulemvuga. 2020. "Recent Budget of Hydroclimatology and Hydrosedimentology of the Congo River in Central Africa." Water 12, no. 9: 2613.

Post conference publication
Published: 16 September 2020 in Proceedings of the International Association of Hydrological Sciences
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The research of ruptures on rainfall and discharge serial data from 1950 to 1995 of three small catchments (from 2000 to 6000 km2) of the Central African Republic, at the boundary between Chad and Congo basins, has shown a high spatial variability. The rupture observed in 1970 at the subcontinental scale, which started the drought period in West and Central Africa, is observed only on the Northward basin, the driest. Then it was difficult to compare the hydroclimatic periods from a basin to another one. However, all the studied basins have shown a degradation of the hydrological regime from the end of the 1980s onward, with a severe level since the end of 1980s. The depletion coefficients have the same range for the 3 studied basins than for the Ubangi River basin, widening the drought impact.

ACS Style

Cyriaque Rufin Nguimalet; Didier Orange. Hydroclimatic variability in Tomi at Sibut, Gribingui at Kaga-Bandoro and Fafa at Bouca basins, in the Central African Republic. Proceedings of the International Association of Hydrological Sciences 2020, 383, 79 -84.

AMA Style

Cyriaque Rufin Nguimalet, Didier Orange. Hydroclimatic variability in Tomi at Sibut, Gribingui at Kaga-Bandoro and Fafa at Bouca basins, in the Central African Republic. Proceedings of the International Association of Hydrological Sciences. 2020; 383 ():79-84.

Chicago/Turabian Style

Cyriaque Rufin Nguimalet; Didier Orange. 2020. "Hydroclimatic variability in Tomi at Sibut, Gribingui at Kaga-Bandoro and Fafa at Bouca basins, in the Central African Republic." Proceedings of the International Association of Hydrological Sciences 383, no. : 79-84.

Post conference publication
Published: 16 September 2020 in Proceedings of the International Association of Hydrological Sciences
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The Red River is a typical example of the Southeast Asian rivers, which has been strongly affected by human activities. This paper analyses the change of total suspended sediment (TSS) load of the Red River from 1960 to 2015 in which numerous new dams in both China and Vietnam have been constructed. A strong decrease of TSS load of the whole Red River (from 79±26×106 t yr−1 in 1960s to 6±1×106 t yr−1 in 2010s) allocated to the dam impoundments in spite of population and deforestation increase. Base on the experimental equation describing the relationship between TSS and total organic nitrogen (TON) concentrations, and on the available data of TSS concentration and river discharge, the longterm TON concentrations and fluxes were calculated for the three tributaries and the whole Red River. The annual average of TON concentrations spatially varied from 0.41 to 3.19 mg L−1, averaging 0.98 mg L−1 for the whole period; the lowest was found for the Da River where the new dams have been impounded. The highest TON concentrations and fluxes occurred in the wet season in relationship with the highest sediment loads and river discharges. The riverine TON fluxes transferred to estuary significantly decreased from 141×103±38×103 t yr−1 (equivalent to 902±247 kg km−2 yr−1) in 1960s to 32×103±5×103 t yr−1 (equivalent to 207±35 kg km−2 yr−1) in 2010s. The TSS flux decrease has driven a clear reduction of associated elements like nitrogen, which let to hypothesis a change in biogeochemical processes in the coastal zone.

ACS Style

Nhu Da Le; Thi Phuong Quynh Le; Thi Xuan Binh Phung; Thi Thuy Duong; Orange Didier. Impact of hydropower dam on total suspended sediment and total organic nitrogen fluxes of the Red River (Vietnam). Proceedings of the International Association of Hydrological Sciences 2020, 383, 367 -374.

AMA Style

Nhu Da Le, Thi Phuong Quynh Le, Thi Xuan Binh Phung, Thi Thuy Duong, Orange Didier. Impact of hydropower dam on total suspended sediment and total organic nitrogen fluxes of the Red River (Vietnam). Proceedings of the International Association of Hydrological Sciences. 2020; 383 ():367-374.

Chicago/Turabian Style

Nhu Da Le; Thi Phuong Quynh Le; Thi Xuan Binh Phung; Thi Thuy Duong; Orange Didier. 2020. "Impact of hydropower dam on total suspended sediment and total organic nitrogen fluxes of the Red River (Vietnam)." Proceedings of the International Association of Hydrological Sciences 383, no. : 367-374.

Post conference publication
Published: 16 September 2020 in Proceedings of the International Association of Hydrological Sciences
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Local peoples from Niakhar in the Senegalese peanut basin highlight a dramatic increase of water access problems due to marked rainfall deficits and salinization of surface and ground water resources. The chemical quality of groundwaters is often critical because of the salinization process, whereas water surfaces, which should be used in such situations, are up early. More and more, lowlands and rivers beds are pervaded by salt crusts. Then the salinization of wells is increasing, leading to the extension of tans (salty of acidified soils). To study the impacts of climatic pejoration on the agroecosystems and on the living conditions of the populations, we carried out the analysis of the time series of the precipitations with daily and annual time steps from 1950 to 2015 on 6 meteorological stations, in situ measurements on 78 wells for an area of 311 km2, as well as local population interviews and field observation. The results confirm an important climatic break in the region in 1970. The long dry period, from 1970 to 2009, has increased the annual rain variability, decreased the number of rainy days per year. We confirm a real and large extension of well salinization, and salt crusting in the lowlands and the riverbeds. From the local people, it seems the process of degradation of the aquifers continues to progress from a large tidal event in 1984. The rainfall increase noted in the last decade does not seem to be enough to reverse the trend and to ensure both the rise of the piezometric level of the aquifers and the desalinization of surface and ground waters.

ACS Style

Waly Faye; Awa Niang Fall; Didier Orange; Frédéric Do; Olivier Roupsard; Alioune Kane. Climatic variability in the Sine-Saloum basin and its impacts on water resources: case of the Sob and Diohine watersheds in the region of Niakhar. Proceedings of the International Association of Hydrological Sciences 2020, 383, 391 -399.

AMA Style

Waly Faye, Awa Niang Fall, Didier Orange, Frédéric Do, Olivier Roupsard, Alioune Kane. Climatic variability in the Sine-Saloum basin and its impacts on water resources: case of the Sob and Diohine watersheds in the region of Niakhar. Proceedings of the International Association of Hydrological Sciences. 2020; 383 ():391-399.

Chicago/Turabian Style

Waly Faye; Awa Niang Fall; Didier Orange; Frédéric Do; Olivier Roupsard; Alioune Kane. 2020. "Climatic variability in the Sine-Saloum basin and its impacts on water resources: case of the Sob and Diohine watersheds in the region of Niakhar." Proceedings of the International Association of Hydrological Sciences 383, no. : 391-399.

Journal article
Published: 28 August 2020 in Geosciences
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For three decades, the solid and dissolved fluxes of the Congo River have been regularly monitored on a monthly basis, despite 12 years of deficiencies (1994–2005). Two programs successively carried out these follow-ups: PEGI/GBF (1987–1993) and SO HYBAM (2006–2017), upstream and downstream, respectively, of the Malebo Pool near Brazzaville, the main hydrometric station of the Congo River. The objective of this study is to examine the temporal dynamic of TSS, TDS and DOC, to explore how these descriptors change over time. Comparison with the two time programs will shed more light on how these descriptors are related to discharge. Afterward, we then find a relationship between total TSS in the water column and that measured in surface for eventual estimation of TSS by remote sensing. In the last decade, compared to the PEGI/GBF period, the discharge of the Congo River was mainly marked by a 4% increase, leading to a significant change on TDS and DOC behaviors. The TSS was quite stable (from 8.2 and 9.3 t km−2 yr−1) due to the low physical erosion well known in this region. The TDS concentrations decreased slightly, by a simple dilution effect. However, the mineral dissolved fluxes (from 11.6 and 10.1 t km-2 yr-1) due to the chemical weathering and atmospheric inputs still predominate over the solid fluxes. Therefore, there was no radical change in the monthly geochemical regime of Congo River Basin (CRB) during these last 30 years. Contrariwise, the DOC concentration marking the biogeochemical processes significantly increased, from 9.0+/−3.0 mg L−1 to 12.7+/−5.0 mg L−1, due to more flooding events in the central part of the CRB. The change for the DOC fluxes is more relevant, with an increase of 45% between the two studied periods, from 11.1 × 106 to 16.2 × 106 t yr−1. This highlights the continuous and actual importance of the “Cuvette Centrale” in the heart of the CRB for dissolved organic matter transport by the Congo River.

ACS Style

Guy N’Kaya; Didier Orange; Sandra Bayonne Padou; Pankyes Datok; Alain Laraque. Temporal Variability of Sediments, Dissolved Solids and Dissolved Organic Matter Fluxes in the Congo River at Brazzaville/Kinshasa. Geosciences 2020, 10, 341 .

AMA Style

Guy N’Kaya, Didier Orange, Sandra Bayonne Padou, Pankyes Datok, Alain Laraque. Temporal Variability of Sediments, Dissolved Solids and Dissolved Organic Matter Fluxes in the Congo River at Brazzaville/Kinshasa. Geosciences. 2020; 10 (9):341.

Chicago/Turabian Style

Guy N’Kaya; Didier Orange; Sandra Bayonne Padou; Pankyes Datok; Alain Laraque. 2020. "Temporal Variability of Sediments, Dissolved Solids and Dissolved Organic Matter Fluxes in the Congo River at Brazzaville/Kinshasa." Geosciences 10, no. 9: 341.

Discussion
Published: 19 August 2020 in Sustainability
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The Paris Climate Agreements and Sustainable Development Goals, signed by 197 countries, present agendas and address key issues for implementing multi-scale responses for sustainable development under climate change—an effort that must involve local, regional, national, and supra-national stakeholders. In that regard, Continental Carbon Sequestration (CoCS) and conservation of carbon sinks are recognized increasingly as having potentially important roles in mitigating climate change and adapting to it. Making that potential a reality will require indicators of success for various stakeholders from multidisciplinary backgrounds, plus promotion of long-term implementation of strategic action towards civil society (e.g., law and policy makers, economists, and farmers). To help meet those challenges, this discussion paper summarizes the state of the art and uncertainties regarding CoCS, taking an interdisciplinary, holistic approach toward understanding these complex issues. The first part of the paper discusses the carbon cycle’s bio-geophysical processes, while the second introduces the plurality of geographical scales to be addressed when dealing with landscape management for CoCS. The third part addresses systemic viability, vulnerability, and resilience in CoCS practices, before concluding with the need to develop inter-disciplinarity in sustainable science, participative research, and the societal implications of sustainable CoCS actions.

ACS Style

Tiphaine Chevallier; Maud Loireau; Romain Courault; Lydie Chapuis-Lardy; Thierry Desjardins; Cécile Gomez; Alexandre Grondin; Frédéric Guérin; Didier Orange; Raphaël Pélissier; Georges Serpantié; Marie-Hélène Durand; Pierre Derioz; Gildas Laruelle Goulven; Marie-Hélène Schwoob; Nicolas Viovy; Olivier Barrière; Eric Blanchart; Vincent Blanfort; Michel Brossard; Julien Demenois; Mireille Fargette; Thierry Heulin; Gil Mahe; Raphaël Manlay; Pascal Podwojewski; Cornélia Rumpel; Benjamin Sultan; Jean-Luc Chotte. Paris Climate Agreement: Promoting Interdisciplinary Science and Stakeholders’ Approaches for Multi-Scale Implementation of Continental Carbon Sequestration. Sustainability 2020, 12, 6715 .

AMA Style

Tiphaine Chevallier, Maud Loireau, Romain Courault, Lydie Chapuis-Lardy, Thierry Desjardins, Cécile Gomez, Alexandre Grondin, Frédéric Guérin, Didier Orange, Raphaël Pélissier, Georges Serpantié, Marie-Hélène Durand, Pierre Derioz, Gildas Laruelle Goulven, Marie-Hélène Schwoob, Nicolas Viovy, Olivier Barrière, Eric Blanchart, Vincent Blanfort, Michel Brossard, Julien Demenois, Mireille Fargette, Thierry Heulin, Gil Mahe, Raphaël Manlay, Pascal Podwojewski, Cornélia Rumpel, Benjamin Sultan, Jean-Luc Chotte. Paris Climate Agreement: Promoting Interdisciplinary Science and Stakeholders’ Approaches for Multi-Scale Implementation of Continental Carbon Sequestration. Sustainability. 2020; 12 (17):6715.

Chicago/Turabian Style

Tiphaine Chevallier; Maud Loireau; Romain Courault; Lydie Chapuis-Lardy; Thierry Desjardins; Cécile Gomez; Alexandre Grondin; Frédéric Guérin; Didier Orange; Raphaël Pélissier; Georges Serpantié; Marie-Hélène Durand; Pierre Derioz; Gildas Laruelle Goulven; Marie-Hélène Schwoob; Nicolas Viovy; Olivier Barrière; Eric Blanchart; Vincent Blanfort; Michel Brossard; Julien Demenois; Mireille Fargette; Thierry Heulin; Gil Mahe; Raphaël Manlay; Pascal Podwojewski; Cornélia Rumpel; Benjamin Sultan; Jean-Luc Chotte. 2020. "Paris Climate Agreement: Promoting Interdisciplinary Science and Stakeholders’ Approaches for Multi-Scale Implementation of Continental Carbon Sequestration." Sustainability 12, no. 17: 6715.

Journal article
Published: 07 May 2019 in Water
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The Red River basin is a typical Asian river system affected by climate and anthropogenic changes. The purpose of this study is to build a tool to separate the effect of climate variability and anthropogenic influences on hydrology and suspended sediments. A modeling method combining in situ and climatic satellite data was used to analyze the discharge (Q) and suspended sediment concentration (SSC) at a daily time scale from 2000 to 2014. Scenarios of natural and actual conditions were implemented to quantify the impacts of climate variability and dams. The modeling gained satisfactory simulation results of water regime and SSC compared to the observations. Under natural conditions, the Q and SSC show decreasing tendencies, and climate variability is the main influence factor reducing the Q. Under actual conditions, SSC is mainly reduced by dams. At the outlet, annual mean Q got reduced by 13% (9% by climate and 4% by dams), and annual mean SSC got reduced to 89% (13% due to climate and 76% due to dams) of that under natural conditions. The climate tendencies are mainly explained by a decrease of 9% on precipitation and 5% on evapotranspiration, which results in a 13% decrease of available water for the whole basin.

ACS Style

Xi Wei; Sabine Sauvage; Thi Phuong Quynh Le; Sylvain Ouillon; Didier Orange; Vu Duy Vinh; José-Miguel Sanchez-Perez. A Modeling Approach to Diagnose the Impacts of Global Changes on Discharge and Suspended Sediment Concentration within the Red River Basin. Water 2019, 11, 958 .

AMA Style

Xi Wei, Sabine Sauvage, Thi Phuong Quynh Le, Sylvain Ouillon, Didier Orange, Vu Duy Vinh, José-Miguel Sanchez-Perez. A Modeling Approach to Diagnose the Impacts of Global Changes on Discharge and Suspended Sediment Concentration within the Red River Basin. Water. 2019; 11 (5):958.

Chicago/Turabian Style

Xi Wei; Sabine Sauvage; Thi Phuong Quynh Le; Sylvain Ouillon; Didier Orange; Vu Duy Vinh; José-Miguel Sanchez-Perez. 2019. "A Modeling Approach to Diagnose the Impacts of Global Changes on Discharge and Suspended Sediment Concentration within the Red River Basin." Water 11, no. 5: 958.

Journal article
Published: 01 February 2019 in La Houille Blanche
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Ce papier revisite l'évolution hydroclimatique de l'Oubangui à Bangui à la faveur d'une nouvelle série hydropluviométrique de 1935 à 2015. Pour cela, les données annuelles pluviométriques et hydrologiques de l'Oubangui à Bangui ont été analysées avec différents tests statistiques (indices pluviométrique et d'écoulement, recherches de ruptures, coefficients de tarissement). La série pluviométrique n'indique toujours qu'une seule cassure en 1970, ce qui confirme l'exceptionnalité de cette rupture climatique en Afrique Centrale. Par contre, la série hydrologique permet d'identifier quatre périodes hydrologiques différentes : 1935-1959, 1960-1970, 1971-1982 et 1982-2013. La dernière période montre un déficit moyen de -22 % (2 893 m3/s) par rapport au débit moyen annuel sur toute la période étudiée (3 700 m3/s.). Les relations moyennes pluie/débit n'ont pas évolué au cours de ces périodes hydroclimatiques, semblant indiquer que le fonctionnement hydrologique de l'Oubangui n'a pas changé du fait de la rupture climatique de 1970. Cela est attribué à la faible anthropisation de ce bassin et la faible évolution de son couvert végétal. Cependant la comparaison de l'évolution annelle du coefficient de tarissement avec le volume mobilisé par l'aquifère pour soutenir les écoulements de l'Oubangui indique clairement un changement de contribution de la nappe avant et après 1970, puis après 2000. The Ubangui River in Bangui comes from The Mbomu River, the CAR side and the Uele River from the DRC. Its flow till Bangui in the bottom has 546 kilometers long and has numerous anastomoses, sprinkled with a good deal of islands and strangulations (Palambo and Bangui). Its side basin is influenced by the Sudano-Guinean variable of dumb tropical climate. This paper revisits the hydroclimatic changes of the Ubangui River at the outlet of Bangui in favor of a new hydropluviometric serial data from 1935 to 2015. The annual rainfall and hydrological data series were analyzed using different statistical tests (rainfall index and flow index, breaks research, depletion coefficients). Rainfall series still shows only one break in 1970, which confirms the exceptionality of this climate disruption in Central Africa. However hydrological series identifies four different hydrological periods: 1935-1959, 1960-1970, 1971-1982 and 1982-2013. The last period shows an average deficit of -22% (2 893 m3/s) compared to the mean annual flow over the entire study period (3 700 m3/s). The average relationship rain/runoff did not change during these well-identified hydroclimatic periods, suggesting that the hydrological functioning of the Ubangui River has not changed because of this climate disruption. It is attributed to the low human impact over this basin and to the small change of the vegetation cover. However the comparison of annual changes in the depletion coefficient with the volume mobilized by the aquifer flows to sustain the Ubangui River flows clearly indicates the relationship change before and after 1970 and after 2000.

ACS Style

Cyriaque-Rufin Nguimalet; Didier Orange. Caractérisation de la baisse hydrologique actuelle de la rivière Oubangui à Bangui, République Centrafricaine. La Houille Blanche 2019, 105, 78 -84.

AMA Style

Cyriaque-Rufin Nguimalet, Didier Orange. Caractérisation de la baisse hydrologique actuelle de la rivière Oubangui à Bangui, République Centrafricaine. La Houille Blanche. 2019; 105 (1):78-84.

Chicago/Turabian Style

Cyriaque-Rufin Nguimalet; Didier Orange. 2019. "Caractérisation de la baisse hydrologique actuelle de la rivière Oubangui à Bangui, République Centrafricaine." La Houille Blanche 105, no. 1: 78-84.

Journal article
Published: 01 March 2018 in Science of The Total Environment
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The development of efficient bioremediation techniques to reduce aquatic pollutant load in natural sediment is one of the current challenges in ecological engineering. A nature-based solution for metal bioremediation is proposed through a combination of bioturbation and phytoremediation processes in experimental indoor microcosms. The invertebrates Tubifex tubifex (Oligochaeta Tubificidae) was used as an active ecological engineer for bioturbation enhancement. The riparian plant species Typha latifolia was selected for its efficiency in phyto-accumulating pollutants from sediment. Phytoremediation efficiency was estimated by using cadmium as a conservative pollutant known to bio-accumulate in plants, and initially introduced in the overlying water (20μg Cd/L of cadmium nitrate - Cd(NO3)2·4H2O). Biological sediment reworking by invertebrates' activity was quantified using luminophores (inert particulates). Our results showed that bioturbation caused by tubificid worms' activity followed the bio-conveying transport model with a downward vertical velocity (V) of luminophores ranging from 16.7±4.5 to 18.5±3.9cm·year(-1). The biotransport changed the granulometric properties of the surface sediments, and this natural process was still efficient under cadmium contamination. The highest value of Cd enrichment coefficient for plant roots was observed in subsurface sediment layer (below 1cm to 5cm depth) with tubificids addition. We demonstrated that biotransport changed the distribution of cadmium across the sediment column as well as it enhanced the pumping of this metal from the surface to the anoxic sediment layers, thereby increasing the bioaccumulation of cadmium in the root system of Typha latifolia. This therefore highlights the potential of bioturbation as a tool to be considered in future as integrated bioremediation strategies of metallic polluted sediment in aquatic ecosystems.

ACS Style

Trung Kien Hoang; Anne Probst; Didier Orange; Franck Gilbert; Arnaud Elger; Jean Kallerhoff; François Laurent; Sabina Bassil; Thi Thuy Duong; Magali Gerino. Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment. Science of The Total Environment 2018, 618, 1284 -1297.

AMA Style

Trung Kien Hoang, Anne Probst, Didier Orange, Franck Gilbert, Arnaud Elger, Jean Kallerhoff, François Laurent, Sabina Bassil, Thi Thuy Duong, Magali Gerino. Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment. Science of The Total Environment. 2018; 618 ():1284-1297.

Chicago/Turabian Style

Trung Kien Hoang; Anne Probst; Didier Orange; Franck Gilbert; Arnaud Elger; Jean Kallerhoff; François Laurent; Sabina Bassil; Thi Thuy Duong; Magali Gerino. 2018. "Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment." Science of The Total Environment 618, no. : 1284-1297.

Article
Published: 08 January 2018 in Environmental Monitoring and Assessment
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Planktons are a major component of food web structure in aquatic ecosystems. Their distribution and community structure are driven by the combination and interactions between physical, chemical, and biological factors within the environment. In the present study, water quality and the community structure of phytoplankton and zooplankton were monthly investigated from January to December 2015 at 11 sampling sites along the gradient course of the Day River (Red River Delta, northern Vietnam). The study demonstrated that the Day River was eutrophic with the average values of total phosphorus concentration 0.17 mg/L, total nitrogen concentration 1.98 mg/L, and Chl a 54 μg/L. Microscopic plankton analysis showed that phytoplankton comprised 87 species belonging to seven groups in which Chlorophyceae, Bacillariophyceae, and Cyanobacteria accounted for the most important constituents of the river’s phytoplankton assemblage. A total 53 zooplankton species belonging to three main groups including Copepoda, Cladocera, and Rotatoria were identified. Plankton biomass values were greatest in rainy season (3002.10-3 cell/L for phytoplankton and 12.573 individuals/m3 for zooplankton). Using principal correspondence and Pearson correlation analyses, it was found that the Day River was divided into three main site groups based on water quality and characteristics of plankton community. Temperature and nutrients (total phosphorus and total nitrogen) are key factors regulating plankton abundance and distribution in the Day River.

ACS Style

Hang Thi Thu Hoang; Thi Thuy Duong; Kien Trung Nguyen; Quynh Thi Phuong Le; Minh Thi Nguyet Luu; Duc Anh Trinh; Anh Hung Le; Cuong Tu Ho; Kim Dinh Dang; Julien Némery; Didier Orange; Judith Klein. Impact of anthropogenic activities on water quality and plankton communities in the Day River (Red River Delta, Vietnam). Environmental Monitoring and Assessment 2018, 190, 67 .

AMA Style

Hang Thi Thu Hoang, Thi Thuy Duong, Kien Trung Nguyen, Quynh Thi Phuong Le, Minh Thi Nguyet Luu, Duc Anh Trinh, Anh Hung Le, Cuong Tu Ho, Kim Dinh Dang, Julien Némery, Didier Orange, Judith Klein. Impact of anthropogenic activities on water quality and plankton communities in the Day River (Red River Delta, Vietnam). Environmental Monitoring and Assessment. 2018; 190 (2):67.

Chicago/Turabian Style

Hang Thi Thu Hoang; Thi Thuy Duong; Kien Trung Nguyen; Quynh Thi Phuong Le; Minh Thi Nguyet Luu; Duc Anh Trinh; Anh Hung Le; Cuong Tu Ho; Kim Dinh Dang; Julien Némery; Didier Orange; Judith Klein. 2018. "Impact of anthropogenic activities on water quality and plankton communities in the Day River (Red River Delta, Vietnam)." Environmental Monitoring and Assessment 190, no. 2: 67.

Original article
Published: 24 May 2017 in Regional Environmental Change
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Research on hydropower development has shown that a diversity of social and environmental impacts of dams is distributed unevenly among various state and corporate actors and riparian populations. This article analyses how two neighbouring socialist states, China and Vietnam, govern dam-induced resettlement along their respective sections of the Red River Watershed. Our investigation focuses on resettlement villages created during the construction of the Madushan (China) and Ban Chat (Vietnam) reservoirs and testifies that resettlement policies on both sides of the border serve statist modernization agendas that fail to acknowledge Dai (China) and Thai (Vietnam) ethnic minority livelihoods. While local populations endure the greatest impacts from dam-induced changes in water allocation and the ensuing consequences for land resources, the benefits of hydropower development are first and foremost shared among state-owned and/or state-backed energy companies. These companies reap huge profits from their role as power generators for capitalist production, while also benefiting from state authorities underevaluating resettled communities’ livelihood assets. A comparison of the two cases reveals that despite the border that separates China and Vietnam, and despite both states emphasizing different resettlement discourses, governance of dam-induced resettlement is strikingly similar.

ACS Style

Jean-François Rousseau; Didier Orange; Sabrina Habich-Sobiegalla; Nguyen Van Thiet. Socialist hydropower governances compared: dams and resettlement as experienced by Dai and Thai societies from the Sino-Vietnamese borderlands. Regional Environmental Change 2017, 17, 2409 -2419.

AMA Style

Jean-François Rousseau, Didier Orange, Sabrina Habich-Sobiegalla, Nguyen Van Thiet. Socialist hydropower governances compared: dams and resettlement as experienced by Dai and Thai societies from the Sino-Vietnamese borderlands. Regional Environmental Change. 2017; 17 (8):2409-2419.

Chicago/Turabian Style

Jean-François Rousseau; Didier Orange; Sabrina Habich-Sobiegalla; Nguyen Van Thiet. 2017. "Socialist hydropower governances compared: dams and resettlement as experienced by Dai and Thai societies from the Sino-Vietnamese borderlands." Regional Environmental Change 17, no. 8: 2409-2419.

Book chapter
Published: 18 January 2017 in Gestion intégrée des ressources naturelles en zones inondables tropicales
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ACS Style

Gil Mahe; Fatogoma Bamba; Didier Orange; Lamine Fofana; Marcel Kuper; Bertrand Marieu; Abdourhamane Soumaguel; Navon Cissé. Dynamique hydrologique du delta intérieur du Niger (Mali). Gestion intégrée des ressources naturelles en zones inondables tropicales 2017, 179 -195.

AMA Style

Gil Mahe, Fatogoma Bamba, Didier Orange, Lamine Fofana, Marcel Kuper, Bertrand Marieu, Abdourhamane Soumaguel, Navon Cissé. Dynamique hydrologique du delta intérieur du Niger (Mali). Gestion intégrée des ressources naturelles en zones inondables tropicales. 2017; ():179-195.

Chicago/Turabian Style

Gil Mahe; Fatogoma Bamba; Didier Orange; Lamine Fofana; Marcel Kuper; Bertrand Marieu; Abdourhamane Soumaguel; Navon Cissé. 2017. "Dynamique hydrologique du delta intérieur du Niger (Mali)." Gestion intégrée des ressources naturelles en zones inondables tropicales , no. : 179-195.

Book chapter
Published: 18 January 2017 in Gestion intégrée des ressources naturelles en zones inondables tropicales
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ACS Style

Adama Mariko; Gil Mahe; Didier Orange; Antoine Royer; Andre Nonguierma; Abou Amani; Eric Servat. Suivi des zones d’inondation du delta intérieur du Niger. Gestion intégrée des ressources naturelles en zones inondables tropicales 2017, 231 -244.

AMA Style

Adama Mariko, Gil Mahe, Didier Orange, Antoine Royer, Andre Nonguierma, Abou Amani, Eric Servat. Suivi des zones d’inondation du delta intérieur du Niger. Gestion intégrée des ressources naturelles en zones inondables tropicales. 2017; ():231-244.

Chicago/Turabian Style

Adama Mariko; Gil Mahe; Didier Orange; Antoine Royer; Andre Nonguierma; Abou Amani; Eric Servat. 2017. "Suivi des zones d’inondation du delta intérieur du Niger." Gestion intégrée des ressources naturelles en zones inondables tropicales , no. : 231-244.

Book chapter
Published: 18 January 2017 in Gestion intégrée des ressources naturelles en zones inondables tropicales
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ACS Style

Didier Orange; Robert Arfi; Vincent Benech; Marcel Kuper; Bertrand Marieu; Ibrahim Sidibé. Impact de la dynamique hydrologique sur les cycles de nutriments en zone inondable tropicale sahélienne. Gestion intégrée des ressources naturelles en zones inondables tropicales 2017, 259 -277.

AMA Style

Didier Orange, Robert Arfi, Vincent Benech, Marcel Kuper, Bertrand Marieu, Ibrahim Sidibé. Impact de la dynamique hydrologique sur les cycles de nutriments en zone inondable tropicale sahélienne. Gestion intégrée des ressources naturelles en zones inondables tropicales. 2017; ():259-277.

Chicago/Turabian Style

Didier Orange; Robert Arfi; Vincent Benech; Marcel Kuper; Bertrand Marieu; Ibrahim Sidibé. 2017. "Impact de la dynamique hydrologique sur les cycles de nutriments en zone inondable tropicale sahélienne." Gestion intégrée des ressources naturelles en zones inondables tropicales , no. : 259-277.

Book chapter
Published: 18 January 2017 in Gestion intégrée des ressources naturelles en zones inondables tropicales
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ACS Style

Marcel Kuper; Christian Mullon; Yveline Poncet; Elisabeth Benga; Pierre Morand; Didier Orange; Gil Mahé; Robert Arfi; Fantagoma Bamba. La modélisation intégrée d’un écosystème inondable. Gestion intégrée des ressources naturelles en zones inondables tropicales 2017, 773 -798.

AMA Style

Marcel Kuper, Christian Mullon, Yveline Poncet, Elisabeth Benga, Pierre Morand, Didier Orange, Gil Mahé, Robert Arfi, Fantagoma Bamba. La modélisation intégrée d’un écosystème inondable. Gestion intégrée des ressources naturelles en zones inondables tropicales. 2017; ():773-798.

Chicago/Turabian Style

Marcel Kuper; Christian Mullon; Yveline Poncet; Elisabeth Benga; Pierre Morand; Didier Orange; Gil Mahé; Robert Arfi; Fantagoma Bamba. 2017. "La modélisation intégrée d’un écosystème inondable." Gestion intégrée des ressources naturelles en zones inondables tropicales , no. : 773-798.