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Open AccessArticle

Soil Erosion Modeling and Comparison Using Slope Units and Grid Cells in Shihmen Reservoir Watershed in Northern Taiwan

1
Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
2
Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Taipei 11494, Taiwan
3
Department of Civil Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
4
Center for Space and Remote Sensing Research, National Central University, Taoyuan 32001, Taiwan
*
Author to whom correspondence should be addressed.
Water 2018, 10(10), 1387; https://doi.org/10.3390/w10101387
Received: 21 August 2018 / Revised: 28 September 2018 / Accepted: 28 September 2018 / Published: 3 October 2018
(This article belongs to the Special Issue Soil Erosion by Water)
Soil erosion is a global problem that will become worse as a result of climate change. While many parts of the world are speculating about the effect of increased rainfall intensity and frequency on soil erosion, Taiwan’s mountainous areas are already facing the power of rainfall erosivity more than six times the global average. To improve the modeling ability of extreme rainfall conditions on highly rugged terrains, we use two analysis units to simulate soil erosion at the Shihmen reservoir watershed in northern Taiwan. The first one is the grid cell method, which divides the study area into 10 m by 10 m grid cells. The second one is the slope unit method, which divides the study area using natural breaks in landform. We compared the modeling results with field measurements of erosion pins. To our surprise, the grid cell method is much more accurate in predicting soil erosion than the slope unit method, although the slope unit method resembles the real terrains much better than the grid cell method. The average erosion pin measurement is 6.5 mm in the Shihmen reservoir watershed, which is equivalent to 90.6 t ha−1 yr−1 of soil erosion. View Full-Text
Keywords: soil erosion; USLE; Shihmen reservoir watershed soil erosion; USLE; Shihmen reservoir watershed
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Liu, Y.-H.; Li, D.-H.; Chen, W.; Lin, B.-S.; Seeboonruang, U.; Tsai, F. Soil Erosion Modeling and Comparison Using Slope Units and Grid Cells in Shihmen Reservoir Watershed in Northern Taiwan. Water 2018, 10, 1387.

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