Abstract
The impact of ponds on basins has recently started to receive its well-deserved scientific attention. In this study, pond-induced impacts on soil erosion and sediment transport were investigated at the scale of the French Claise basin. In order to determine erosion and sediment transport patterns of the Claise, the Coordination of Information on the Environment (CORINE) erosion and Soil and Water Assessment Tool (SWAT) models were used. The impact of ponds on the studied processes was revealed by means of land cover change scenarios, using ponded versus pondless inputs. Results show that under current conditions (pond presence), 12.48% of the basin corresponds to no-erosion risk zones (attributed to the dense pond network), while 65.66% corresponds to low-erosion risk, 21.68% to moderate-erosion risk, and only 0.18% to high-erosion risk zones. The SWAT model revealed that ponded sub-basins correspond to low sediment yields areas, in contrast to the pondless sub-basins, which yield appreciably higher erosion rates. Under the alternative pondless scenario, erosion risks shifted to 1.12%, 0.52%, 76.8%, and 21.56% for no, low, moderate, and high-erosion risks, respectively, while the sediment transport pattern completely shifted to higher sediment yield zones. This approach solidifies ponds as powerful human-induced modifications to hydro/sedimentary processes.
Highlights
IntroductionUnderstanding the impact of land occupation (land use/cover) on basin processes, such as rainfall-runoff and soil erosion, is an integral part of land and water management-oriented decisions [1,2]
Understanding the impact of land occupation on basin processes, such as rainfall-runoff and soil erosion, is an integral part of land and water management-oriented decisions [1,2].The processes of soil erosion and sediment transport take part in van Rijn’s (1993) [3] sedimentary cycle, and often are the main causes of soil loss in basins [4]
In response to Directive Cadre sur l’Eau (DCE) recommendations, this study aims to assess the impact of man–made ponds on soil erosion and sediment transport, at the scale of the Indre portion of the Claise basin
Summary
Understanding the impact of land occupation (land use/cover) on basin processes, such as rainfall-runoff and soil erosion, is an integral part of land and water management-oriented decisions [1,2]. The processes of soil erosion and sediment transport take part in van Rijn’s (1993) [3] sedimentary cycle, and often are the main causes of soil loss in basins [4]. These processes are of natural origin [5], the interaction between climate, soil, topography, land use, and land cover significantly influences erosion rates and sediment loads [6,7]. The reliable assessment and representation of sediment yields—which depend on the cascading effect of soil erosion—allows an in-depth understanding of the soil erosion-sediment link at the basin scale [9]
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