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Effects of DTM resolution on slope steepness and soil loss prediction on hillslope profiles


Moreira, Eder Paulo; Elliot, William J.; Hudak, Andrew T. 2011. Effects of DTM resolution on slope steepness and soil loss prediction on hillslope profiles. Paper presented at the XXXIII Brazilian Congess of Soil Sience symposium, Soils: Climate change and sustainability; July 31-Aug. 5, 2011; Uberlandia, Minas Gerais, Brazil. 4 p.

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.

Keyword: WEPP, soil erosion, Digital Terrain Models, LiDAR


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http://www.fs.fed.us/rm/pubs_other/rmrs_2011_moreira_e001.pdf

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Title: RMRS Other Publications: Effects of DTM resolution on slope steepness and soil loss prediction on hillslope profiles
Electronic Publish Date: September 10, 2012
Last Update:
September 10, 2012

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