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MODELING OF PROCESSES ASSOCIATED WITH WATER EROSION ON A HILLSLOPE
Abstract
Hillslopes comprise the greater part of the landscape and as an integral part of drainage basins; they provide water and sediment to water courses. Also, hillslopes are frequently used in agriculture. Soil erosion caused by water is a natural phenomenon, but the negative effects are accentuated by human interventions in the landscape. Soil erosion and nutrient loss are detrimental to agricultural products, food security, and the sustainability of ecosystem functioning. In recent decades, the increased using of chemical fertilizer and corresponding nutrient loss from inclined farmland owing to agricultural activities have received increasing attention from specialists in domain of agriculture, hydrology and environment protection. This paper present the possibility to modeling of processes associated with soil erosion by water on hillslopes with WEPP model. The Water Erosion Prediction Project (WEPP) model developed by United States Department of Agriculture ? Agricultural Research Service, is a process-based, distributed parameter, continuous simulation, erosion prediction model, is applicable to hillslope erosion processes (sheet and rill erosion), as well as simulation of the hydrologic and erosion processes on small watersheds. Processes considered in hillslope profile model applications include rill and interrill erosion, sediment transport and deposition, infiltration, soil consolidation, residue and canopy effects on soil detachment and infiltration, surface sealing, rill hydraulics, surface runoff, plant growth, residue decomposition, percolation, evaporation, transpiration, snow melt, frozen soil effects on infiltration and erodibility, climate, tillage effects on soil properties, effects of soil random roughness, and contour effects including potential overtopping of contour ridges. The WEPP model was applied on hillslope situated in Bega river catchment, Timis county, Romania.
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References4
http://www.iowastormwater.org/
http://prescriptionsoilanalysis.com/
USDA (US Department of Agriculture), Water Erosion Prediction Project Hillslope Profile and Watershed Model Documentation, NSERL Report #10, USA, July 1995.
OSPA (Agrochemical and Pedological Studies Agency Timisoara), Study of Manastiur Village Soils, Timis County, Romania, 1982.
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