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Olivier Boutron
Tour du Valat Research Institute, Le Sambuc, 13200 Arles, France

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Short Biography

My research focuses on the functioning of Mediterranean lagoon hydrosystems in terms of water, salt, and temperature dynamics. I also study the catchment basins and coastal strips linked to these lagoons. Their functioning is characterised by setting up a network for making continuous measurements, and also by developing 2D and 3D hydrodynamic models. The models I develop make it possible to test out the influence of different methods of water management (manipulations of hydraulic infrastructure and hydraulic works) on the hydrological, thermal, and saline regimes of the study sites. They are used to define the conservation, restoration, and management actions to be implemented on the sites. The midterm objective is to be able to use them to provide indications about the consequences of climate change on this functioning. Another aspect of my research is characterising the influence of hydrology on the dynamics of the pathogenic agents, such as the avian flu virus, present in the water, a project carried out in collaboration with the Tour du Valat’s Species Department and its research on health ecology.

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Journal article
Published: 25 June 2021 in Journal of Marine Science and Engineering
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The Vaccarès Lagoon System, located in the central part of the Rhône Delta (France), is a complex shallow coastal lagoon, exposed to a typical Mediterranean climate and a specific hydrological regime affected by man-controlled exchanges with the sea and agricultural drainage channels. In this article, we report the results obtained by a series of monitoring programs, with different spatial and temporal resolutions. Long-term datasets from 1999 to 2019 with data collected on a monthly basis and a high spatial resolution highlighted the significant spatial heterogeneity in salinity regimes, and helped to determine the long-term evolution of the total mass of dissolved salt. High-frequency surveys allowed to characterize the water levels and salinity dynamics seasonal response to (i) the exchanges with the Mediterranean Sea, (ii) the exchanges with agricultural drainage channels, and (iii) the rain and evaporation. In addition, wind effects on salinity variations are also explored. This work shows how different spatial and temporal monitoring strategies provide complementary information on the dynamic of such a complex system. Results will be useful and provide insight for the management of similar lagoon systems, accommodating for both human activities and ecological stakes in the context of global change.

ACS Style

Olivier Boutron; Caroline Paugam; Emilie Luna-Laurent; Philippe Chauvelon; Damien Sous; Vincent Rey; Samuel Meulé; Yves Chérain; Anais Cheiron; Emmanuelle Migne. Hydro-Saline Dynamics of a Shallow Mediterranean Coastal Lagoon: Complementary Information from Short and Long Term Monitoring. Journal of Marine Science and Engineering 2021, 9, 701 .

AMA Style

Olivier Boutron, Caroline Paugam, Emilie Luna-Laurent, Philippe Chauvelon, Damien Sous, Vincent Rey, Samuel Meulé, Yves Chérain, Anais Cheiron, Emmanuelle Migne. Hydro-Saline Dynamics of a Shallow Mediterranean Coastal Lagoon: Complementary Information from Short and Long Term Monitoring. Journal of Marine Science and Engineering. 2021; 9 (7):701.

Chicago/Turabian Style

Olivier Boutron; Caroline Paugam; Emilie Luna-Laurent; Philippe Chauvelon; Damien Sous; Vincent Rey; Samuel Meulé; Yves Chérain; Anais Cheiron; Emmanuelle Migne. 2021. "Hydro-Saline Dynamics of a Shallow Mediterranean Coastal Lagoon: Complementary Information from Short and Long Term Monitoring." Journal of Marine Science and Engineering 9, no. 7: 701.

Journal article
Published: 16 June 2021 in Sustainability
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Sustainable conservation planning depends on understanding local context including the way social values impact a landscape. Flamingos are used here as a flagship species to focus the social values of a broad range of people living in and working in the Camargue in France. A survey questionnaire (n = 87) was used to identify the range of ways in which people value the landscape and their perception of effectiveness of flamingo management strategies. Survey analysis was conducted through a multi-method approach, triangulating standard descriptive statistics, qualitative data analysis, and multivariate analysis applying numerical taxonomy. Applying numerical taxonomy allowed us to identify and define six social assemblages. Each assemblage had geographical characteristics with distinct values and perceptions in relation to management. The primary residence and geographic identity of the participants was defining, showing clear value differences from participants living in different parts of the delta. The participants most frequently agreed that flamingos contributed to the aesthetic, economic, biodiversity, and recreational values of the landscape. We show how identifying points of consensus and points in contest is necessary for navigating differences in values for conservation planning. This research shows the importance of the local social context in sustainably managing landscape change.

ACS Style

Lisa Ernoul; Angela Wardell-Johnson; Raphaël Mathevet; Alain Sandoz; Olivier Boutron; Loïc Willm; Stephan Arnassant; Arnaud Béchet. Context in Landscape Planning: Improving Conservation Outcomes by Identifying Social Values for a Flagship Species. Sustainability 2021, 13, 6827 .

AMA Style

Lisa Ernoul, Angela Wardell-Johnson, Raphaël Mathevet, Alain Sandoz, Olivier Boutron, Loïc Willm, Stephan Arnassant, Arnaud Béchet. Context in Landscape Planning: Improving Conservation Outcomes by Identifying Social Values for a Flagship Species. Sustainability. 2021; 13 (12):6827.

Chicago/Turabian Style

Lisa Ernoul; Angela Wardell-Johnson; Raphaël Mathevet; Alain Sandoz; Olivier Boutron; Loïc Willm; Stephan Arnassant; Arnaud Béchet. 2021. "Context in Landscape Planning: Improving Conservation Outcomes by Identifying Social Values for a Flagship Species." Sustainability 13, no. 12: 6827.

Journal article
Published: 20 May 2021 in Remote Sensing
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The relevant benefits of hyperspectral sensors for water column determination and seabed features mapping compared to multispectral data, especially in coastal areas, have been demonstrated in recent studies. In this study, we used hyperspectral satellite data in the accurate mapping of the bathymetry and the composition of water habitats for inland water. Particularly, the identification of the bottom diversity for a shallow lagoon (less than 2 m in depth) was examined. Hyperspectral satellite data were simulated based on aerial hyperspectral imagery acquired above a lagoon, namely the Vaccarès lagoon (France), considering the spatial and spectral resolutions, and the signal-to-noise ratio of a satellite sensor, BIODIVERSITY, that is under study by the French space agency (CNES). Various sources of uncertainties such as inter-band calibration errors and atmospheric correction were considered to make the dataset realistic. The results were compared with a recently launched hyperspectral sensor, namely the DESIS sensor (DLR, Germany). The analysis of BIODIVERSITY-like sensor simulated data demonstrated the feasibility to satisfactorily estimate the bathymetry with a root-mean-square error of 0.28 m and a relative error of 14% between 0 and 2 m. In comparison to open coastal waters, the retrieval of bathymetry is a more challenging task for inland waters because the latter usually shows a high abundance of hydrosols (phytoplankton, SPM, and CDOM). The retrieval performance of seabed abundance was estimated through a comparison of the bottom composition with in situ data that were acquired by a recently developed imaging camera (SILIOS Technologies SA., France). Regression coefficients for the retrieval of the fractional species abundances from the theoretical inversion and measurements were obtained to be 0.77 (underwater imaging camera) and 0.80 (in situ macrophytes data), revealing the potential of the sensor characteristics. By contrast, the comparison of the in situ bathymetry and macrophyte data with the DESIS inverted data showed that depth was estimated with an RSME of 0.38 m and a relative error of 17%, and the fractional species abundance was estimated to have a regression coefficient of 0.68.

ACS Style

Audrey Minghelli; Sayoob Vadakke-Chanat; Malik Chami; Mireille Guillaume; Emmanuelle Migne; Patrick Grillas; Olivier Boutron. Estimation of Bathymetry and Benthic Habitat Composition from Hyperspectral Remote Sensing Data (BIODIVERSITY) Using a Semi-Analytical Approach. Remote Sensing 2021, 13, 1999 .

AMA Style

Audrey Minghelli, Sayoob Vadakke-Chanat, Malik Chami, Mireille Guillaume, Emmanuelle Migne, Patrick Grillas, Olivier Boutron. Estimation of Bathymetry and Benthic Habitat Composition from Hyperspectral Remote Sensing Data (BIODIVERSITY) Using a Semi-Analytical Approach. Remote Sensing. 2021; 13 (10):1999.

Chicago/Turabian Style

Audrey Minghelli; Sayoob Vadakke-Chanat; Malik Chami; Mireille Guillaume; Emmanuelle Migne; Patrick Grillas; Olivier Boutron. 2021. "Estimation of Bathymetry and Benthic Habitat Composition from Hyperspectral Remote Sensing Data (BIODIVERSITY) Using a Semi-Analytical Approach." Remote Sensing 13, no. 10: 1999.

Journal article
Published: 17 May 2021 in Estuarine, Coastal and Shelf Science
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The present paper is specifically focused on enclosed or semi-enclosed basins where the wind is the dominant driver of water surface tilting, leading to the so-called wind tide contributing to water levels rise. Wind-induced free surface tilting is studied using the 1-D steady form of the depth-averaged shallow water (Saint-Venant) momentum equation which reflects the depth-averaged local balance between surface slope and wind stress. Two contrasted field sites, the Berre and Vaccarès lagoons, have been monitored providing water level data along a reference axis. This study highlighted the occurrence of wind tides at the two field sites. The bimodal wind exposure ensured the robustness of the observations, with non-linear but symmetric behaviors patterns observed in winds from opposite directions. It is observed that the higher the wind speed, the steeper the slope of the free surface in accordance with the well known basic trend. In addition, a significant effect of depth is observed, with greater surface tilting in the shallower lagoon. The data analysis confirmed the robustness of such a simple approach in the present context. Using the additional assumption of constant, i.e. wind-independent, drag coefficients (CD) allowed a good match with the observations for moderate wind speeds for both sites. However, the depth effect required the CD to be increased in the shallower basin. Classical empirical wind-dependent CD parameterizations provide better wind-tide predictions than the constant-CD approach in very strong wind conditions but totally failed in predicting surface tilting in the shallower site, suggesting that physical parameters other than wind speed should be taken into account for the CD parameterization in very shallow lagoons.

ACS Style

Caroline Paugam; Damien Sous; Vincent Rey; Samuel Meulé; Vincent Faure; Olivier Boutron; Emilie Luna-Laurent; Emmanuelle Migne. Wind tides and surface friction coefficient in semi-enclosed shallow lagoons. Estuarine, Coastal and Shelf Science 2021, 257, 107406 .

AMA Style

Caroline Paugam, Damien Sous, Vincent Rey, Samuel Meulé, Vincent Faure, Olivier Boutron, Emilie Luna-Laurent, Emmanuelle Migne. Wind tides and surface friction coefficient in semi-enclosed shallow lagoons. Estuarine, Coastal and Shelf Science. 2021; 257 ():107406.

Chicago/Turabian Style

Caroline Paugam; Damien Sous; Vincent Rey; Samuel Meulé; Vincent Faure; Olivier Boutron; Emilie Luna-Laurent; Emmanuelle Migne. 2021. "Wind tides and surface friction coefficient in semi-enclosed shallow lagoons." Estuarine, Coastal and Shelf Science 257, no. : 107406.

Journal article
Published: 30 October 2015 in Water
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The spatiotemporal structure of wind-driven circulation patterns and associated water exchanges can drive important bio-hydrodynamic interactions in shallow lagoons. The Vaccarès lagoon system is a complex shallow hydrosystem located in the central part of the Rhône Delta (France). It is internationally recognized as part of a biosphere reserve within the framework of UNESCO’s Man and Biosphere Programme, and as a RAMSAR site. Due to its frequent occurrence in this area, and considering the shallowness of the Vaccarès lagoon system, wind is assumed to play a major role in the hydrodynamic and biological processes. In this study, a hydrodynamic model was developed to investigate the structure of wind-driven circulations in the Vaccarès lagoon system, to provide insights into their role in transport and water exchange processes. The implementation and assessment (calibration and validation) of the model is presented first. Simulations were then performed for two typical steady wind conditions and for one measured unsteady wind event. The results illustrate the influence of the complex geometry of the Vaccarès lagoon system on the wind-driven circulations, and the differences observed between the different sub-lagoons in this system. The differences in wind-induced water exchanges between these sub-lagoons are also discussed.

ACS Style

Olivier Boutron; Olivier Bertrand; Annie Fiandrino; Patrick Höhener; Alain Sandoz; Yves Chérain; Eric Coulet; Philippe Chauvelon. An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccarès Lagoon System. Water 2015, 7, 5986 -6016.

AMA Style

Olivier Boutron, Olivier Bertrand, Annie Fiandrino, Patrick Höhener, Alain Sandoz, Yves Chérain, Eric Coulet, Philippe Chauvelon. An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccarès Lagoon System. Water. 2015; 7 (11):5986-6016.

Chicago/Turabian Style

Olivier Boutron; Olivier Bertrand; Annie Fiandrino; Patrick Höhener; Alain Sandoz; Yves Chérain; Eric Coulet; Philippe Chauvelon. 2015. "An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccarès Lagoon System." Water 7, no. 11: 5986-6016.