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Dr. Saskia Visser
Wageningen University and Research, Wageningen, The Netherlands

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0 Environmental Performance
0 Sustainable land use
0 Climate-smart land use
0 Data revolution
0 Healthy soils

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Report
Published: 01 January 2021 in Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society
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ACS Style

Nina de Roo; Cdi Advisory; Janita Sanderse; Petra de Boer; Dirk van Apeldoorn; Birgit Boogaard; Anet Blanken; Jan Brouwers; Simone van der Burg; Mark Camara; Malik Dasoo; Ivo Demmers; Monice van Dongen; Walter Fraanje; Miriam Haukes; Riti Herman Mostert; Alexander Laarman; Cees Leeuwis; Bert Lotz; Philip Macnaghten; Tamara Metze; Jeanne Nel; Hanneke Nijland; Leneke Pfeiffer; Simone Ritzer; Eirini Sakellari; Herman Snel; Gert Spaargaren; Wijnand Sukkel; Antoinette Thijssen; Daoud Urdu; Saskia Visser; Marieke van Vonderen; Simone van Vugt; Marjan Wink; Ingeborg de Wolf; Cvi Onderzoek; Wass; Pe&rc; Philosophy; Staff Cvc; Lei Datalab. Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society. Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society 2021, 1 .

AMA Style

Nina de Roo, Cdi Advisory, Janita Sanderse, Petra de Boer, Dirk van Apeldoorn, Birgit Boogaard, Anet Blanken, Jan Brouwers, Simone van der Burg, Mark Camara, Malik Dasoo, Ivo Demmers, Monice van Dongen, Walter Fraanje, Miriam Haukes, Riti Herman Mostert, Alexander Laarman, Cees Leeuwis, Bert Lotz, Philip Macnaghten, Tamara Metze, Jeanne Nel, Hanneke Nijland, Leneke Pfeiffer, Simone Ritzer, Eirini Sakellari, Herman Snel, Gert Spaargaren, Wijnand Sukkel, Antoinette Thijssen, Daoud Urdu, Saskia Visser, Marieke van Vonderen, Simone van Vugt, Marjan Wink, Ingeborg de Wolf, Cvi Onderzoek, Wass, Pe&rc, Philosophy, Staff Cvc, Lei Datalab. Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society. Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society. 2021; ():1.

Chicago/Turabian Style

Nina de Roo; Cdi Advisory; Janita Sanderse; Petra de Boer; Dirk van Apeldoorn; Birgit Boogaard; Anet Blanken; Jan Brouwers; Simone van der Burg; Mark Camara; Malik Dasoo; Ivo Demmers; Monice van Dongen; Walter Fraanje; Miriam Haukes; Riti Herman Mostert; Alexander Laarman; Cees Leeuwis; Bert Lotz; Philip Macnaghten; Tamara Metze; Jeanne Nel; Hanneke Nijland; Leneke Pfeiffer; Simone Ritzer; Eirini Sakellari; Herman Snel; Gert Spaargaren; Wijnand Sukkel; Antoinette Thijssen; Daoud Urdu; Saskia Visser; Marieke van Vonderen; Simone van Vugt; Marjan Wink; Ingeborg de Wolf; Cvi Onderzoek; Wass; Pe&rc; Philosophy; Staff Cvc; Lei Datalab. 2021. "Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society." Wageningen Dialogue : Hands-on navigator to explore why, when and how to engage with dialogue in research formore impact in society , no. : 1.

Viewpoint
Published: 29 November 2019 in Sustainability
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The Sustainable Development Goals (SDGs) can be grouped into three domains, the environmental domain, the social domain and the economic domain. These different layers influence each other; hence sustainable progress in the economic layer cannot be achieved without good progress in the two other layers. To achieve the SDGs, transitions in the current system are needed and actions should be taken that support transitions and contribute to short term needs and long term (global) goals. Therefore, it is necessary to have knowledge of transitions and understand the different phases of transition. In this paper we discuss the key role of the soil-water system in these transitions and the achievement of the SDGs by 2030. The increasing pressure on land calls for multi-use of land and for the restoration of degraded land. Healthy soils and healthy land are the basic conditions for the successful implementation and realization of the SDGs. To enable a sustainable management of the soil and water system a transition approach is a prerequisite. In the X-curve used to describe transitions, soil and land stakeholders are given a framework, which provides perspective for action, specifically for science and governance stakeholders in each phase of the transition. This framework can provide the required intensive guidance to (1) analyze the impact of provided incentives, (2) identify new reference points in the transition and (3) stimulate transition catalysts, and (iv) innovate by testing cutting edge policy instruments in close cooperation with society. The key to make the necessary transitions and realize the SDGs by 2030 lies in the intensive guidance to combining initiatives, steering knowledge flows and continuously assessing the stage of the transition, in order to plan specific steps needed to progress in the transition framework. Both scientist and policy makers have an important role in this guidance.

ACS Style

Saskia Visser; Saskia Keesstra; Gilbert Maas; Margot De Cleen; Co Molenaar. Soil as a Basis to Create Enabling Conditions for Transitions Towards Sustainable Land Management as a Key to Achieve the SDGs by 2030. Sustainability 2019, 11, 6792 .

AMA Style

Saskia Visser, Saskia Keesstra, Gilbert Maas, Margot De Cleen, Co Molenaar. Soil as a Basis to Create Enabling Conditions for Transitions Towards Sustainable Land Management as a Key to Achieve the SDGs by 2030. Sustainability. 2019; 11 (23):6792.

Chicago/Turabian Style

Saskia Visser; Saskia Keesstra; Gilbert Maas; Margot De Cleen; Co Molenaar. 2019. "Soil as a Basis to Create Enabling Conditions for Transitions Towards Sustainable Land Management as a Key to Achieve the SDGs by 2030." Sustainability 11, no. 23: 6792.

Report
Published: 01 January 2019 in Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0
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ACS Style

Marjoleine Hanegraaf; Ppo Agv Team Bedrijfssystemenonderzoek/bodemkwaliteit; Erik Van Den Elsen; Janjo De Haan; Saskia Visser; Water And Land Use Alterra - Soil; Soil Physics and Land Management. Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0. Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0 2019, 1 .

AMA Style

Marjoleine Hanegraaf, Ppo Agv Team Bedrijfssystemenonderzoek/bodemkwaliteit, Erik Van Den Elsen, Janjo De Haan, Saskia Visser, Water And Land Use Alterra - Soil, Soil Physics and Land Management. Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0. Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0. 2019; ():1.

Chicago/Turabian Style

Marjoleine Hanegraaf; Ppo Agv Team Bedrijfssystemenonderzoek/bodemkwaliteit; Erik Van Den Elsen; Janjo De Haan; Saskia Visser; Water And Land Use Alterra - Soil; Soil Physics and Land Management. 2019. "Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0." Bodemkwaliteitsbeoordeling van landbouwgronden in Nederland - indicatorset en systematiek, versie 1.0 , no. : 1.

Abstract
Published: 01 January 2019 in Proceedings
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The Sustainable Development Goals (SDGs) can be grouped into three domains, the environmental domain, the social domain and the economic domain. These different layers influence each other; hence sustainable progress in the economic layer cannot be achieved without good progress in the two other layers. To achieve the SDGs, transitions in the current system are needed and actions should be taken that support transitions and contribute to short term needs and long term (global) goals. Therefore, it is necessary to have knowledge of transitions and understand the different phases of transition. In this paper we discuss the key role of the soil-water system in these transitions and the achievement of the SDGs by 2030. The increasing pressure on land calls for multi-use of land and for the restoration of degraded land. Healthy soils and healthy land are the basic conditions for the successful implementation and realization of the SDGs. To enable a sustainable management of the soil and water system a transition approach is a prerequisite. In the X-curve used to describe transitions, soil and land stakeholders are given a framework, which provides perspective for action, specifically for science and governance stakeholders in each phase of the transition. This framework can provide the required intensive guidance to (i) analyze the impact of provided incentives, (ii) identify new reference points in the transition and (iii) stimulate transition catalysts, and (iv) innovate by testing cutting edge policy instruments in close cooperation with society. The key to make the necessary transitions and realize the SDGs by 2030 lies in the intensive guidance to combining initiatives, steering knowledge flows and continuously assessing the stage of the transition, in order to plan specific steps needed to progress in the transition framework. Both scientist and policy makers have an important role in this guidance.

ACS Style

Saskia M. Visser; Saskia Keesstra; Gilbert Maas; Margot De Cleen; Co Molenaar. Soil as a Basis to Create Enabling Conditions for Transitions towards Sustainable Land Management as a Key to Achieve the SDGs by 2030. Proceedings 2019, 30, 27 .

AMA Style

Saskia M. Visser, Saskia Keesstra, Gilbert Maas, Margot De Cleen, Co Molenaar. Soil as a Basis to Create Enabling Conditions for Transitions towards Sustainable Land Management as a Key to Achieve the SDGs by 2030. Proceedings. 2019; 30 (1):27.

Chicago/Turabian Style

Saskia M. Visser; Saskia Keesstra; Gilbert Maas; Margot De Cleen; Co Molenaar. 2019. "Soil as a Basis to Create Enabling Conditions for Transitions towards Sustainable Land Management as a Key to Achieve the SDGs by 2030." Proceedings 30, no. 1: 27.

Journal article
Published: 10 November 2018 in Land
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In the effort to achieve the Sustainable Development Goals (SDGs) related to food, health, water, and climate, an increase in pressure on land is highly likely. To avoid further land degradation and promote land restoration, multifunctional use of land is needed within the boundaries of the soil-water system. In addition, awareness-raising, a change in stakeholders’ attitudes, and a change in economics are essential. The attainment of a balance between the economy, society, and the biosphere calls for a holistic approach. In this paper, we introduce four concepts that we consider to be conducive to realizing LDN in a more integrated way: systems thinking, connectivity, nature-based solutions, and regenerative economics. We illustrate the application of these concepts through three examples in agricultural settings. Systems thinking lies at the base of the three others, stressing feedback loops but also delayed responses. Their simultaneous use will result in more robust solutions, which are sustainable from an environmental, societal, and economic point of view. Solutions also need to take into account the level of scale (global, national, regional, local), stakeholders’ interests and culture, and the availability and boundaries of financial and natural capital. Furthermore, sustainable solutions need to embed short-term management in long-term landscape planning. In conclusion, paradigm shifts are needed. First, it is necessary to move from excessive exploitation in combination with environmental protection, to sustainable use and management of the soil-water system. To accomplish this, new business models in robust economic systems are needed based on environmental systems thinking; an approach that integrates environmental, social, and economic interests. Second, it is necessary to shift from a “system follows function” approach towards a “function follows system” one. Only by making the transition towards integrated solutions based on a socio-economical-ecological systems analysis, using concepts such as nature-based solutions, do we stand a chance to achieve Land Degradation Neutrality by 2030. To make these paradigm shifts, awareness-raising in relation to a different type of governance, economy and landscape and land-use planning and management is needed.

ACS Style

Saskia Keesstra; Gerben Mol; Jan De Leeuw; Joop Okx; Co Molenaar; Margot De Cleen; Saskia Visser. Soil-Related Sustainable Development Goals: Four Concepts to Make Land Degradation Neutrality and Restoration Work. Land 2018, 7, 133 .

AMA Style

Saskia Keesstra, Gerben Mol, Jan De Leeuw, Joop Okx, Co Molenaar, Margot De Cleen, Saskia Visser. Soil-Related Sustainable Development Goals: Four Concepts to Make Land Degradation Neutrality and Restoration Work. Land. 2018; 7 (4):133.

Chicago/Turabian Style

Saskia Keesstra; Gerben Mol; Jan De Leeuw; Joop Okx; Co Molenaar; Margot De Cleen; Saskia Visser. 2018. "Soil-Related Sustainable Development Goals: Four Concepts to Make Land Degradation Neutrality and Restoration Work." Land 7, no. 4: 133.

Journal article
Published: 08 December 2014 in GeoResJ
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Coastal dunes are the primary defence protecting the coastline from the destructive forces of the sea in The Netherlands. Aeolian processes are important in this context as they contribute to dune accretion and thus the safety of the coastal hinterland. In this study, we analyze horizontal and vertical variability of event scale aeolian sand transport on a wide beach on the island of Ameland, The Netherlands. Data were obtained from a meteorological station, groundwater monitoring wells and a camera installed on the beach. Fifteen aeolian transport events (two involving onshore winds, seven longshore and six offshore) were measured using a comprehensive grid of 37 customized MWAC traps. The highest sand transport rates and largest variability was found for alongshore events. Surface moisture, governed by groundwater, was found to be an important controlling parameter for aeolian transport rates and vertical flux profiles. Groundwater levels were largely dominated by beach inundation, influencing the groundwater table for a two week period. Variations in vertical flux profiles between traps were larger for wet sand transport events than dry ones. In general, sand transport rates were highest at the foreshore and lowest at the dune toe. Sand transport dynamics are dependent on local conditions such as beach dimensions, beach orientation and also meteorological and surface characteristics. Moderate (high frequency, low magnitude) events are also capable of transporting large amounts of sand. Future studies should include spatially explicit measurements of elevation and surface moisture to obtain a more complete understanding of the complex sand transport dynamics.

ACS Style

A. Poortinga; J.G.S. Keijsers; S.M. Visser; M.J.P.M. Riksen; A.C.W. Baas. Temporal and spatial variability in event scale aeolian transport on Ameland, The Netherlands. GeoResJ 2014, 5, 23 -35.

AMA Style

A. Poortinga, J.G.S. Keijsers, S.M. Visser, M.J.P.M. Riksen, A.C.W. Baas. Temporal and spatial variability in event scale aeolian transport on Ameland, The Netherlands. GeoResJ. 2014; 5 ():23-35.

Chicago/Turabian Style

A. Poortinga; J.G.S. Keijsers; S.M. Visser; M.J.P.M. Riksen; A.C.W. Baas. 2014. "Temporal and spatial variability in event scale aeolian transport on Ameland, The Netherlands." GeoResJ 5, no. : 23-35.

Journal article
Published: 01 July 2014 in PeerJ
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This dataset contains data from two different studies on aeolian sediment transport. The first study was conducted in Dori, Burkina Faso, the second at Ameland, the Netherlands. The first dataset contains data from a degraded (deg), dune and valley site for 11 events. The second dataset contains data of 18 catchers for 6 different events

ACS Style

Ate Poortinga; Joep G.S. Keijsers; Jerry Maroulis; Saskia Visser. Measurement uncertainties in quantifying aeolian mass flux: evidence from wind tunnel and field site data. PeerJ 2014, 2, e454 .

AMA Style

Ate Poortinga, Joep G.S. Keijsers, Jerry Maroulis, Saskia Visser. Measurement uncertainties in quantifying aeolian mass flux: evidence from wind tunnel and field site data. PeerJ. 2014; 2 ():e454.

Chicago/Turabian Style

Ate Poortinga; Joep G.S. Keijsers; Jerry Maroulis; Saskia Visser. 2014. "Measurement uncertainties in quantifying aeolian mass flux: evidence from wind tunnel and field site data." PeerJ 2, no. : e454.

Proceedings article
Published: 14 November 2013 in Soil Erosion
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ACS Style

Saskia Visser; S.M.. Quantification of Erosion by Wind and Water in Burkina Faso. Soil Erosion 2013, 1 .

AMA Style

Saskia Visser, S.M.. Quantification of Erosion by Wind and Water in Burkina Faso. Soil Erosion. 2013; ():1.

Chicago/Turabian Style

Saskia Visser; S.M.. 2013. "Quantification of Erosion by Wind and Water in Burkina Faso." Soil Erosion , no. : 1.

Journal article
Published: 01 November 2013 in Mountain Research and Development
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The Northern Uplands of Vietnam form one of the largest ecological regions in the country, characterized by complex biophysical conditions and a high diversity in ethnic minorities, cultures, and farming systems. The Doi moi ("renovation?) program has, since the early 1980s, resulted in significant changes in agriculture production and related economic trends. However, poverty, low agricultural productivity, and land degradation are still major problems. This article illustrates the factors that drive these problems by analyzing agricultural land use in Suoi Con, a small agroforestry watershed in the Northern Uplands. We first identified the current land-use systems and analyzed constraints on agricultural production. The results indicate that although low soil fertility and land degradation are considerable problems, availability of household capital, low technology levels, and land fragmentation are major constraints on agricultural development. These constraints were analyzed from different points of view to identify mismatches between the implementation of top-down government policies and specific conditions that may explain why actual land-use change in the Northern Uplands deviates from the government's development plans. Results of land-use analysis in the Suoi Con watershed suggest that participatory and bottom-up approaches are needed to better understand problems and opportunities in household agricultural production in order to develop appropriate land-use plans and policies

ACS Style

Bui Tan Yen; Saskia Visser; Chu Thai Hoanh; Leo Stroosnijder. Constraints on Agricultural Production in the Northern Uplands of Vietnam. Mountain Research and Development 2013, 33, 404 -415.

AMA Style

Bui Tan Yen, Saskia Visser, Chu Thai Hoanh, Leo Stroosnijder. Constraints on Agricultural Production in the Northern Uplands of Vietnam. Mountain Research and Development. 2013; 33 (4):404-415.

Chicago/Turabian Style

Bui Tan Yen; Saskia Visser; Chu Thai Hoanh; Leo Stroosnijder. 2013. "Constraints on Agricultural Production in the Northern Uplands of Vietnam." Mountain Research and Development 33, no. 4: 404-415.

Journal article
Published: 17 May 2013 in Hydrological Processes
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Developing models to predict on‐site soil erosion and off‐site sediment transport at the agricultural watershed scale represent an on‐going challenge in research today. This study attempts to simulate the daily discharge and sediment loss using a distributed model that combines surface and sub‐surface runoffs in a small hilly watershed (< 1 km2). The semi‐quantitative model, Predict and Localize Erosion and Runoff (PLER), integrates the Manning–Strickler equation to simulate runoff and the Griffith University Erosion System Template equation to simulate soil detachment, sediment storage and soil loss based on a map resolution of 30 m × 30 m and over a daily time interval. By using a basic input data set and only two calibration coefficients based, respectively, on water velocity and soil detachment, the PLER model is easily applicable to different agricultural scenarios. The results indicate appropriate model performance and a high correlation between measured and predicted data with both Nash–Sutcliffe efficiency (Ef) and correlation coefficient (r2) having values > 0.9. With the simple input data needs, PLER model is a useful tool for daily runoff and soil erosion modeling in small hilly watersheds in humid tropical areas. Copyright © 2013 John Wiley & Sons, Ltd.

ACS Style

Yen Tan Bui; Didier Orange; Saskia Visser; Chu Thai Hoanh; M. Laissus; Ate Poortinga; Duc Toan Tran; Leo Stroosnijder. Lumped surface and sub-surface runoff for erosion modeling within a small hilly watershed in northern Vietnam. Hydrological Processes 2013, 28, 2961 -2974.

AMA Style

Yen Tan Bui, Didier Orange, Saskia Visser, Chu Thai Hoanh, M. Laissus, Ate Poortinga, Duc Toan Tran, Leo Stroosnijder. Lumped surface and sub-surface runoff for erosion modeling within a small hilly watershed in northern Vietnam. Hydrological Processes. 2013; 28 (6):2961-2974.

Chicago/Turabian Style

Yen Tan Bui; Didier Orange; Saskia Visser; Chu Thai Hoanh; M. Laissus; Ate Poortinga; Duc Toan Tran; Leo Stroosnijder. 2013. "Lumped surface and sub-surface runoff for erosion modeling within a small hilly watershed in northern Vietnam." Hydrological Processes 28, no. 6: 2961-2974.

Journal article
Published: 01 May 2013 in Mountain Research and Development
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ACS Style

Fiona Proscovia Mutekanga; Aad Kessler; Katia Leber; Saskia Visser. The Use of Stakeholder Analysis in Integrated Watershed Management. Mountain Research and Development 2013, 33, 122 -131.

AMA Style

Fiona Proscovia Mutekanga, Aad Kessler, Katia Leber, Saskia Visser. The Use of Stakeholder Analysis in Integrated Watershed Management. Mountain Research and Development. 2013; 33 (2):122-131.

Chicago/Turabian Style

Fiona Proscovia Mutekanga; Aad Kessler; Katia Leber; Saskia Visser. 2013. "The Use of Stakeholder Analysis in Integrated Watershed Management." Mountain Research and Development 33, no. 2: 122-131.

Research papers
Published: 24 April 2013 in Journal of Hydraulic Research
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Wind-driven rain (WDR) experiments were conducted to evaluate the interrill component of the Water Erosion Prediction Project model with a two-dimensional experimental set-up in a wind tunnel. Synchronized wind and rain simulations were applied to soil surfaces on windward and leeward slopes of 7, 15 and 20%. Since WDR fall trajectory varied with horizontal wind velocities of 6, 10, and 14 m s−1, magnitude of raindrop normal and lateral stresses on flow at the impact-flow boundary also changed and differentially directed lateral jets of raindrop splashes with respect to downward flows occurred. To account for interactions between raindrop impact and interrill shallow flow, a vector approach with kinetic energy fluxes of both raindrop splashes and flow were used and this resulted in greater correlations in predicting sediment delivery rates.

ACS Style

Günay Erpul; Donald Gabriels; L. Darrell Norton; Dennis C. Flanagan; Chi Hua Huang; Saskia Visser. Raindrop and flow interactions for interrill erosion with wind-driven rain. Journal of Hydraulic Research 2013, 51, 548 -557.

AMA Style

Günay Erpul, Donald Gabriels, L. Darrell Norton, Dennis C. Flanagan, Chi Hua Huang, Saskia Visser. Raindrop and flow interactions for interrill erosion with wind-driven rain. Journal of Hydraulic Research. 2013; 51 (5):548-557.

Chicago/Turabian Style

Günay Erpul; Donald Gabriels; L. Darrell Norton; Dennis C. Flanagan; Chi Hua Huang; Saskia Visser. 2013. "Raindrop and flow interactions for interrill erosion with wind-driven rain." Journal of Hydraulic Research 51, no. 5: 548-557.

Journal article
Published: 22 April 2013 in Geomorphology
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Physically-based, catchment scale sediment delivery models have become increasingly complex, sophisticated and are suitable for a diverse range of environmental contexts. However, in their attempts to best represent the physical processes of erosion and deposition, these models require large and detailed input datasets. When such data are unavailable, annual sediment yield models are relied upon. However, in this class of models, widely available data such as daily precipitation and discharge are disregarded resulting in a reduction in temporal accuracy. To fill this scientific and management gap, the landscape evolution model LAPSUS was adapted (LAPSUS-D) for a meso-scale catchment to model sediment yield on a daily resolution. The water balance component within the model enables the calibration of the model in terms of water discharge with measured daily discharge at the outlet. This methodology is especially important when modeling sediment yield from catchments which are ungaged catchments in terms of sediment, but where hydrological data are available. As the simulation of sediment yield was the main objective of the study, the calibration focused on peak discharge. The focus on peak discharge provides insight into the capability of the model to generate, route and deliver sediment at the outlet of a meso-scale catchment. LAPSUS-D has daily temporal resolution and requires a 10 to 30 m pixel size DEM, soil map, land-use map and daily hydrological records (precipitation and discharge). In this paper we present the first assessment of the hydrological model performance and an analysis of the sensitivity of the model to input parameters. Our study site is a 23-km2 catchment in Upper Nysa Szalona, southwest Poland with temperate climate. Results show that the model can reliably predict peak discharge, which is expected in future studies to allow reliable estimates of sediment transport capacity, redistribution and yield.

ACS Style

S.D. Keesstra; A.J.A.M. Temme; J.M. Schoorl; S.M. Visser. Evaluating the hydrological component of the new catchment-scale sediment delivery model LAPSUS-D. Geomorphology 2013, 212, 97 -107.

AMA Style

S.D. Keesstra, A.J.A.M. Temme, J.M. Schoorl, S.M. Visser. Evaluating the hydrological component of the new catchment-scale sediment delivery model LAPSUS-D. Geomorphology. 2013; 212 ():97-107.

Chicago/Turabian Style

S.D. Keesstra; A.J.A.M. Temme; J.M. Schoorl; S.M. Visser. 2013. "Evaluating the hydrological component of the new catchment-scale sediment delivery model LAPSUS-D." Geomorphology 212, no. : 97-107.

Journal article
Published: 07 December 2012 in Soil and Tillage Research
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Crop productivity in Rwanda is declining as a result of intensive farming on steep slopes, which leads to soil loss and declining soil fertility particularly in the northern highlands. Slow-forming terraces have been widely adopted in the northern highlands of Rwanda to control soil erosion however not much been done to evaluate their efficiency. We hypothesized that slow-forming terraces reduce soil loss and soil fertility gradients compared with non-conserved land. A field experiment compared the soil erosion rates and fertility gradients of 20+ year old terraces where sole grass strips (Pennisetum purpureum) or grass strips combined with infiltration ditches were used with those of land where no soil conservation technologies were applied. The experiment was conducted in the year 2010 on three landscape positions (Upperslope, Hillslope and Footslope) along a representative toposequence using farmers’ fields where potato and maize were grown in two consecutive cropping seasons. The highest annual soil loss (41.5 t ha−1) was recorded with plots receiving no soil conservation practices while the lowest annual soil loss (18 t ha−1) was recorded with grass strips combined with infiltration ditches. The slow-forming terraces showed a marked “within” spatial difference in both soil quality and crop yield. The soil in the lower part of the terraces showed as much as 57% more organic carbon content and 31% more available phosphorous than the soil in the upper part. Organic carbon (OC) was higher (OC = 2.1%) on the upperslope than on hillslope (OC = 1.9%). Less than 2.3 t ha−1 of the mean potato yield (23 t ha−1) and only 0.5 t ha−1 of the mean maize yield (5 t ha−1) were recorded on the uppermost third of the terraces on all three landscape positions. The marked soil fertility gradients indicate that the sustainability of slow-forming terraces is threatened, unless a site-specific fertilizer strategy is developed. For the sustainability of these terraces, the current practice of “harvesting” the fertile soil from the lower edge of the grass strip and using it as fertilizer for the nutrient deficient upper parts of terraces needs to be stopped.

ACS Style

D.M. Kagabo; L. Stroosnijder; S.M. Visser; D. Moore. Soil erosion, soil fertility and crop yield on slow-forming terraces in the highlands of Buberuka, Rwanda. Soil and Tillage Research 2012, 128, 23 -29.

AMA Style

D.M. Kagabo, L. Stroosnijder, S.M. Visser, D. Moore. Soil erosion, soil fertility and crop yield on slow-forming terraces in the highlands of Buberuka, Rwanda. Soil and Tillage Research. 2012; 128 ():23-29.

Chicago/Turabian Style

D.M. Kagabo; L. Stroosnijder; S.M. Visser; D. Moore. 2012. "Soil erosion, soil fertility and crop yield on slow-forming terraces in the highlands of Buberuka, Rwanda." Soil and Tillage Research 128, no. : 23-29.

Journal article
Published: 01 July 2012 in Geomorphology
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ACS Style

Feras Youssef; Saskia M. Visser; Derek Karssenberg; Gunay Erpul; Wim M. Cornelis; Donald Gabriels; Ate Poortinga. The effect of vegetation patterns on wind-blown mass transport at the regional scale: A wind tunnel experiment. Geomorphology 2012, 159-160, 178 -188.

AMA Style

Feras Youssef, Saskia M. Visser, Derek Karssenberg, Gunay Erpul, Wim M. Cornelis, Donald Gabriels, Ate Poortinga. The effect of vegetation patterns on wind-blown mass transport at the regional scale: A wind tunnel experiment. Geomorphology. 2012; 159-160 ():178-188.

Chicago/Turabian Style

Feras Youssef; Saskia M. Visser; Derek Karssenberg; Gunay Erpul; Wim M. Cornelis; Donald Gabriels; Ate Poortinga. 2012. "The effect of vegetation patterns on wind-blown mass transport at the regional scale: A wind tunnel experiment." Geomorphology 159-160, no. : 178-188.

Research article
Published: 28 May 2012 in Earth Surface Processes and Landforms
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The vector physics of wind‐driven rain (WDR) differs from that of wind‐free rain, and the interrill soil detachment equations in the Water Erosion Prediction Project (WEPP) model were not originally developed to deal with this phenomenon. This article provides an evaluation of the performance of the interrill component of the WEPP model for WDR events. The interrill delivery rates were measured in the wind tunnel facility of the International Center for Eremology (ICE), Ghent University, Belgium with an experimental setup to study different raindrop impact velocity vectors. Synchronized wind and rain simulations with wind velocities of 6, 10 and 14 m s–1 were applied to a test surface placed on windward and leeward slopes of 7, 15 and 20%. Since both rainfall intensity and raindrop impact velocity varied greatly depending on differences in the horizontal wind velocity under WDRs, the resultant kinetic energy flux (KEr, in J m–2 s–1) was initially used in place of the WEPP model intensity term in order to incorporate the effect of wind on impact velocity and frequency of raindrops. However, our results showed only minor improvement in the model predictions. For all research data, the model Coefficients of Determination (r2) were 0·63 and 0·71, when using the WEPP and the KEr approaches, respectively. Alternately, integrating the angle of rain incidence into the model by vectorally partitioning normal kinetic energy flux (KErn, in J m–2 s–1) from the KEr greatly improved the model's ability to estimate the interrill sediment delivery rates (r2 = 0·91). This finding suggested that along with the fall trajectory of wind‐driven raindrops with a given frequency, raindrop velocity and direction at the point of impact onto the soil surface provided sufficient physical information to improve WEPP sediment delivery rate predictions under WDR. Copyright © 2012 John Wiley & Sons, Ltd.

ACS Style

Gunay Erpul; Donald Gabriels; L. Darrell Norton; Dennis C. Flanagan; Chi-Hua Huang; Saskia Visser. Mechanics of interrill erosion with wind-driven rain. Earth Surface Processes and Landforms 2012, 38, 160 -168.

AMA Style

Gunay Erpul, Donald Gabriels, L. Darrell Norton, Dennis C. Flanagan, Chi-Hua Huang, Saskia Visser. Mechanics of interrill erosion with wind-driven rain. Earth Surface Processes and Landforms. 2012; 38 (2):160-168.

Chicago/Turabian Style

Gunay Erpul; Donald Gabriels; L. Darrell Norton; Dennis C. Flanagan; Chi-Hua Huang; Saskia Visser. 2012. "Mechanics of interrill erosion with wind-driven rain." Earth Surface Processes and Landforms 38, no. 2: 160-168.

Discussion
Published: 30 November 2011 in Aeolian Research
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ACS Style

Ate Poortinga; Saskia Visser; Micel J.P.M. Riksen; Leo Stroosnijder. Beneficial effects of wind erosion: Concepts, measurements and modeling. Aeolian Research 2011, 3, 81 -86.

AMA Style

Ate Poortinga, Saskia Visser, Micel J.P.M. Riksen, Leo Stroosnijder. Beneficial effects of wind erosion: Concepts, measurements and modeling. Aeolian Research. 2011; 3 (2):81-86.

Chicago/Turabian Style

Ate Poortinga; Saskia Visser; Micel J.P.M. Riksen; Leo Stroosnijder. 2011. "Beneficial effects of wind erosion: Concepts, measurements and modeling." Aeolian Research 3, no. 2: 81-86.

Mini review
Published: 15 November 2011 in Ecological Economics
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This study analyzes factors that contribute to the livelihood of smallholder farmers living in the vicinity of the Cyabayaga and Rugeramigozi wetlands. Three tools were used: 1) focus group discussion 2) formal surveys and 3) Monitoring for Quality Improvement (MONQI). Farming systems in wetlands and on hillsides differ. Level of education, resource availability, land ownership and location have an important impact on the location and type of farming systems practiced by households. The dependency of households on wetlands varies between sites. Field size, status of soil fertility and input use are also key factors determining the level of contribution that wetland agriculture makes to farmers' livelihood. In Cyabayaga, the per household per year contribution of wetland cultivation to gross margin (GM) was 74% ($1901) compared to 24% ($84) in Rugeramigozi. The rice in Cyabayaga was the largest contributor to household income providing on average $1045 per household per season. Vegetables cultivated in the dry season in Rugeramigozi have high potential as cash crops. Poor maintenance of drainage and irrigation channels as well as inappropriate cropping systems in wetlands can undermine sustainability and have repercussions for the livelihoods of farmers dependent on agricultural wetlands.

ACS Style

N.L. Nabahungu; S.M. Visser. Contribution of wetland agriculture to farmers' livelihood in Rwanda. Ecological Economics 2011, 71, 4 -12.

AMA Style

N.L. Nabahungu, S.M. Visser. Contribution of wetland agriculture to farmers' livelihood in Rwanda. Ecological Economics. 2011; 71 ():4-12.

Chicago/Turabian Style

N.L. Nabahungu; S.M. Visser. 2011. "Contribution of wetland agriculture to farmers' livelihood in Rwanda." Ecological Economics 71, no. : 4-12.

Journal article
Published: 29 July 2011 in Land Degradation & Development
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Most of Rwanda's wetlands are being reclaimed under government schemes with the aim of growing rice as the main crop. In the present study, information on farmers' knowledge and perceptions of agricultural wetland management was collected in Cyabayaga and Rugeramigozi wetlands. The two wetlands were selected as representatives for typical reclaimed wetland agriculture in Rwanda. They provide contrasts in both environmental and social terms. Three tools were used to investigate farmers' knowledge and perception of agricultural wetland management: (i) household survey; (ii) focus group discussions; and (iii) transect walk. The major constraints identified by farmers in the two wetlands were water shortage and lack of availability of improved seeds and high prices of fertilisers. The primary benefits from wetlands for farmers are income generation in Cyabayaga and food security in Rugeramigozi. The most commonly reported concern about the wetlands in the Cyabayaga and Rugerameragozi was that they are a source of malaria. Rice is an important crop in both wetlands, whereas farmers in Cyabahaga wish to continue cultivating rice, Rugeramigozi farmers prefer to grow rice only after it has been tested for its adaptability. Farmers have sufficient knowledge on the causes and the potential solutions to overcome most constraints. They know that soil suitability is closely related to relief. They classify soils by a number of criteria and choose crops accordingly. Any programme designed to address wetland management in the region will have to take account of farmers' knowledge and adopt a holistic view of wetland management. Copyright © 2011 John Wiley & Sons, Ltd.

ACS Style

N. L. Nabahungu; Saskia Visser. FARMERS' KNOWLEDGE AND PERCEPTION OF AGRICULTURAL WETLAND MANAGEMENT IN RWANDA. Land Degradation & Development 2011, 24, 363 -374.

AMA Style

N. L. Nabahungu, Saskia Visser. FARMERS' KNOWLEDGE AND PERCEPTION OF AGRICULTURAL WETLAND MANAGEMENT IN RWANDA. Land Degradation & Development. 2011; 24 (4):363-374.

Chicago/Turabian Style

N. L. Nabahungu; Saskia Visser. 2011. "FARMERS' KNOWLEDGE AND PERCEPTION OF AGRICULTURAL WETLAND MANAGEMENT IN RWANDA." Land Degradation & Development 24, no. 4: 363-374.

Journal article
Published: 13 April 2011 in Aeolian Research
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Despite the fact that wind erosion seriously affects the sustainable use of land in a large part of the world, validated wind erosion model that predicts windblown mass transport on a regional scale is lacking. The objectives of this research were to modify revised wind erosion equation (RWEQ) to estimate soil loss at a field scale in a way that it could operate at a regional scale, to calibrate the model using ground data collected from a field scale representing different land uses in Khanasser valley, Syria, and to estimate the total sediment fluxes (kg m−1) and soil losses (kg m−2) for farming fields. We implemented a modified version of RWEQ that represents wind erosion as a transient process, using time steps of 6 h. Beside this a number of adaptations including estimation of mass flux over the field boundaries, and the routing of sediment have been done. Originally, RWEQ was created and calibrated for application at the scale in USA. Due to the adaptations imparted to the original RWEQ and the different environmental condition in Syria of application areas, an intensive calibration process was required before applying the model to estimate the net soil loss from the experimental fields. The results of this test showed that the modified version of RWEQ provided acceptable predictions for the average mass flux from the measurement plot with a linear regression coefficient of R2 of 0.57 and 0.83 for the (d) test for the 20 wind events at the six tested plots.

ACS Style

Feras Youssef; Saskia Visser; Derek Karssenberg; Adriana Bruggeman; Günay Erpul. Calibration of RWEQ in a patchy landscape; a first step towards a regional scale wind erosion model. Aeolian Research 2011, 3, 467 -476.

AMA Style

Feras Youssef, Saskia Visser, Derek Karssenberg, Adriana Bruggeman, Günay Erpul. Calibration of RWEQ in a patchy landscape; a first step towards a regional scale wind erosion model. Aeolian Research. 2011; 3 (4):467-476.

Chicago/Turabian Style

Feras Youssef; Saskia Visser; Derek Karssenberg; Adriana Bruggeman; Günay Erpul. 2011. "Calibration of RWEQ in a patchy landscape; a first step towards a regional scale wind erosion model." Aeolian Research 3, no. 4: 467-476.