Study on relationship between underlying surface of typical warping dam and erosion and sediment yield

Abstract

Under the condition of rainstorm, the underlying surface is an important factor of erosion and sediment yield, and an important embodiment of the process of soil erosion and the law of sediment deposition. This paper analyzes the soil erosion of warping dams with different underlying surface characteristics based on the data of typical warping dams, such as sedimentation amount, sediment retention modulus and underlying surface. The results show that: (1) the average slope of dam55, dam97 and dam011 is 27.55°, 30.79° and 34.68° respectively, and the erosion modulus is 11020t/km2, 15204 t/km2 and 22579 t/km2 respectively; the average slope of dam55, dam97 and dam011 is positively correlated with the erosion modulus, and the correlation coefficient is 0.9889. (2) The sedimentation depth and erosion modulus of dam011 are significantly higher than those of dam55 and dam97. Under the condition of rainstorm, the average slope of watershed is an important factor of soil erosion, which can better reflect and predict the comprehensive intensity of soil erosion.