Improvement of the K-Factor of USLE and Soil Erosion Estimation in Shihmen Reservoir Watershed

Bor-Shiun Lin, Chun-Kai Chen, Kent Thomas, Chen-Kun Hsu and Hsing-Chuan Ho
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Bor-Shiun Lin: Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Taipei 11494, Taiwan
Chun-Kai Chen: Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Taipei 11494, Taiwan
Kent Thomas: Department of Civil Engineering, National Taipei University of Technology, Taipei 11494, Taiwan
Chen-Kun Hsu: Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Taipei 11494, Taiwan
Hsing-Chuan Ho: Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Taipei 11494, Taiwan

Sustainability, 2019, vol. 11, issue 2, 1-16

Abstract: The estimation of soil erosion in Taiwan and many countries of the world is based on the widely used universal soil loss equation (USLE), which includes the factor of soil erodibility (K-factor). In Taiwan, K-factor values are referenced from past research compiled in the Taiwan Soil and Water Conservation Manual , but there is limited data for the downstream area of the Shihmen reservoir watershed. The designated K-factor from the manual cannot be directly applied to large-scale regional levels and also cannot distinguish and clarify the difference of soil erosion between small field plots or subdivisions. In view of the above, this study establishes additional values of K-factor by utilizing the double rings infiltration test and measures of soil physical–chemical properties and increases the spatial resolution of K-factor map for Shihmen reservoir watershed. Furthermore, the established values of K-factors were validated with the designated value set at Fuxing Sanmin from the manual for verifying the correctness of estimates. It is found that the comparative results agree well with established estimates within an allowable error range. Thus, the K-factors established by this study update the previous K-factor system and can be spatially estimated for any area of interest within the Shihmen reservoir watershed and improving upon past limitations.

Keywords: USLE; soil erodibility; double rings infiltration test (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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