Analysis on gravitational sediment yield in the check-dam controlled basins of Chabagou Watershed
Gravitational sediment yield in the typical watersheds of the Loess Plateau is the study object in this paper.Six small watersheds controlled by check-dams are selected as the study basins.Sediment deposition data in the reservoirs of 1978-2001 are used as the total amount of erosion in the six basins.Chinese Soil Loss Equation mode (CSLE) is used to calculate erosion amount by water,and the gully erosion factor is added in this model.Through this method,gravitational sediment yield is distinguished from total erosion amount.The result shows that the percentages of gravitational sediment yield in total sediment yield in the six check-dam watersheds are about 0％,51.0％,54.1％,59.0％,65.0％ and 67.0％,respectively.It has significant linear positive correlation between gravity erosion sediment yield and the gully slope areas of steeper than 32°,and gully slope degree is the controlling factor of the gravitational erosion.Therefore reduce gully slope degree can significantly lower sediment yield in the watersheds of Loess Plateau.
国家科技期刊平台
NSTL
万方数据
维普
