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Advisor(s)
Abstract(s)
Diffuse pollution from agricultural activities is a major environmental problem. The extent of the impacts is driven, e.g., by local topography due to the influence on hydrological processes. This study aims to investigate the use of dif-ferent scale topographic data in assessing runoff-erosion processes. The TopAG-NPS module, a component of the AnnAGNPS model (Annualized Agriculture Nonpoint Source), was used to assess the impact of the vertical resolution of the Digital Elevation Model (DEM) on the topographic and hydrological configura-tion of a basin, and on the simulation of soil erosion. The study focuses on a small agro-forestry basin (190 ha) located in the municipality of Idanha-a-Nova, Portu-gal. A georeferenced survey of the basin’s surface drainage network was carried out and then compared with the results of the simulated drainage networks gener-ated by the TopAGNPS module using two DEMs with vertical resolutions of 1 m and 5 m. The DEM with a 5 m vertical resolution produced unsatisfactory results, as evidenced by significant discrepancies between the simulated and observed nat-ural drainage networks. On the other hand, the drainage network generated with the DEM of 1 m resolution was very similar to the observed drainage network. The use of distinct topographic configurations modeled based on different vertical resolution DEMs on the estimation of soil erosion by water using the RUSLE model (Revised Universal Soil Loss Equation), resulted in significant differences considering the values of 5.85 and 4.17 ton/ha.year for the DEM with 1 m and 5 m vertical resolution, respectively. Considering that soil erosion by water and other processes, such as the transport of pollutants, are distributed processes, it is of great relevance to consider good topographic and hydrologic configurations to achieve more reliable simulations and better support decision-making.
Description
Autor correspondente: Duarte, António Canatário.
Keywords
Digital elevation model Data resolution AnnAGNPS model Soil erosion Agroforestry basin
Pedagogical Context
Citation
DUARTE, A.C. ; FERREIRA, Carla ; VITALI, GIULIANO (2025) - Topography and hydrology modeling and influence on soil erosion simulation, at small basin scale. In Çiner, A. [et al.] (Eds.) - Recent research on environmental earth sciences, geomorphology, soil science, paleoclimate, and karst. p. 107–113, 2025. DOI: 10.1007/978-3-031-86866-5_17
Publisher
Springer Nature
Collections
CC License
Without CC licence