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	Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms
	Li TieJian ; Wang GuangQian ; Xue Hai ; Wang Kai
	2010-10-12 ; 2010-10-12
关键词	scale effect soil erosion hyper-concentrated sediment-laden flow the Loess Plateau BASIN MANAGEMENT MODELS YIELD FLOW Engineering, Multidisciplinary Materials Science, Multidisciplinary
中文摘要	Scale effects exist in the whole process of rainfall-3-runoff-3-soil erosion-3-sediment transport in river basins. The differences of hydrographs and sediment graphs in different positions in a river basin are treated as basic scale effects, which are more complex in the gullied Loess Plateau, a region notorious for high intensity soil erosion and hyper-concentrated sediment-laden flow. The up-scaling method of direct extrapolation that maintains dynamical mechanism effective in large scale application was chosen as the methodology of this paper. Firstly, scale effects of hydrographs and sediment graphs were analyzed by using field data, and key sub-processes and their mechanisms contributing to scale effects were clearly defined. Then, the Digital Yellow River Model that integrates sub-models for the subprocesses was used with high resolution to simulate rainfall-3-runoff-3-soil erosion-3-sediment transport response in Chabagou watershed, and the distributed results representing scale effects were obtained. Finally, analysis on the simulation results was carried out. It was shown that gravitational erosion and hyper-concentrated flow contribute most to the spatial variation of hydrographs and sediment graphs in the spatial scale. Different spatial scale distributions and superposition of different sub-processes are the mechanisms of scale effects.
语种	英语 ; 英语
出版者	SCIENCE PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/82045]
专题	清华大学
推荐引用方式 GB/T 7714	Li TieJian,Wang GuangQian,Xue Hai,et al. Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms[J],2010, 2010.
APA	Li TieJian,Wang GuangQian,Xue Hai,&Wang Kai.(2010).Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms..
MLA	Li TieJian,et al."Soil erosion and sediment transport in the gullied Loess Plateau: Scale effects and their mechanisms".(2010).

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