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《JOURNAL OF SOIL WATER CONSERVATION》 1999-01
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Erosion and Sediment Yield of Hyperconcentrated Flows on Loess Plateau

XU Jong xing (Institute of Geography,Chinese Academy of Sciences,Beijing\ 100101)  
Hyperconcentrated flows are observed in the middle Yellow River basin. They occur as a result of erosion, but once they form on slopes, they operate as a strong eroding and sediment carrying force and play an important role in drainage basin erosion and sediment production processes. Since the energy expenditure is less and sediment carrying capacity is greater, hyperconcentrated flows have very high eroding and transporting abilities. These exists a strong coupling relation between hyperconcentrated flow transport and gravitational erosion, which ensures a rapid removal of mass wasted materials. Hyperconcentrated flows are an important factor responsible for the high intensity erosion and sediment yield in the middle Yellow River basin. Many previous studies have indicated that the sediment delivery ratio on the Loess Plateau approaches 1. This can be explained by action of hyperconcentrated flows. As hyperconcentrated flows exhibit some particular behaviors in erosion and sediment production processes, the study suggests that the erosion by hyperconcentrated flows was regarded as a special type of erosion.
【Fund】: 国家自然科学基金
【CateGory Index】: S157.1
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