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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology

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Proc. IAHS, 377, 9-18, 2018
https://doi.org/10.5194/piahs-377-9-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
16 Apr 2018
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, and Jian-Long Chen College of Resources and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
Abstract. 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 the measured values. The results showed that the mean modulus of soil erosion is 1224, 1118 and 875 t km−2 yr−1 and annual soil loss is 23 130, 21 130 and 16 536 in 2000, 2005 and 2010 respectively. The measured mean erosion modulus were 1581 and 1377 t km−2 yr−1, and the measured annual soil loss were 29 872 and 26 022 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.
Citation: Wang, L., Qian, J., Qi, W.-Y., Li, S.-S., and Chen, J.-L.: Changes in soil erosion and sediment transport based on the RUSLE model in Zhifanggou watershed, China, Proc. IAHS, 377, 9-18, https://doi.org/10.5194/piahs-377-9-2018, 2018.
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By using the RUSLE model and GIS, changes of sediment yield and sediment transport were assessed in Zhifanggou watershed. The obtained results were basically consistent with the measured values. From 2000 to 2010, the amount of soil erosion was reduced yearly. The soil erosion intensity of terraced fields, sloping land and construction land were mainly very low due to soil and water conservation measures. And soil erosion increases with increasing slope in the range of 0–15 °.
By using the RUSLE model and GIS, changes of sediment yield and sediment transport were assessed...
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