U.S. Department of Agriculture: Forest Service -- National Agroforestry Center


Date of this Version



XXXIII Congresso Brasileiro de Ciencia do Solo, solos nos biomas brasilerios: sustentabilidade e mudancas climaticas 31 de julho a 05 de agosto- Center Convention- Uberlandia/Minas Gerais, (2010)


Topographic attributes play a critical role in predicting erosion in models such as the Water Erosion Prediction Project (WEPP). The effects of four different high resolution hillslope profiles were studied using four different DTM resolutions: 1-m, 3-m, 5-m and 10-m. The WEPP model used a common scenario encountered in the forest environment and the selected hillslope profiles to calculate the average annual runoff, average annual soil loss and average annual sediment delivery. The DTM resolution affects the slope steepness as well as the erosion and sediment delivery predicted by WEPP. The slope steepness values generated from higher resolution DTMs were less than from lower resolution DTMs. The trends in predicted average annual soil loss as a function of DTM resolution showed the same pattern as for slope steepness.