Changes in soil erosion and sediment transport based on the RUSLE model in Zhifanggou watershed, China

Lei Wang, Ju Qian, Wen-Yan Qi, Sheng-Shuang Li, Jian-Long Chen
2018 Proceedings of the International Association of Hydrological Sciences  
<p><strong>Abstract.</strong> In this paper, changes of sediment yield and sediment transport were assessed using the Revised Universal Soil Loss Equation (RUSLE) and Geographical Information Systems (GIS). This model was based on the integrated use of precipitation data, Landsat images in 2000, 2005 and 2010, terrain parameters (slope gradient and slope length) and soil composition in Zhifanggou watershed, Gansu Province, Northwestern China. The obtained results were basically consistent with
more » ... ly consistent with the measured values. The results showed that the mean modulus of soil erosion is 1224, 1118 and 875<span class="thinspace"></span>t<span class="thinspace"></span>km<sup>−2</sup><span class="thinspace"></span>yr<sup>−1</sup> and annual soil loss is 23<span class="thinspace"></span>130, 21<span class="thinspace"></span>130 and 16<span class="thinspace"></span>536 in 2000, 2005 and 2010 respectively. The measured mean erosion modulus were 1581 and 1377<span class="thinspace"></span>t<span class="thinspace"></span>km<sup>−2</sup><span class="thinspace"></span>yr<sup>−1</sup>, and the measured annual soil loss were 29<span class="thinspace"></span>872 and 26<span class="thinspace"></span>022<span class="thinspace"></span>t in 2000 and 2005. From 2000 to 2010, the amount of soil erosion was reduced yearly. Very low erosion and low erosion dominated the soil loss status in the three periods, and moderate erosion followed. The zones classified as very low erosion were increasing, whereas the zones with low or moderate erosion were decreasing. In 2010, no zones were classified as high or very high soil erosion.</p>
doi:10.5194/piahs-377-9-2018 fatcat:bopbn666qfdank76uxhunupkzi