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| Ephemeral gully erosion experiment on hydrodynamics parameter of concentrated flow in hilly area of Loess Plateau |
| Gong Jiaguo 1,2,Wang Wenlong 1,3,Guo Junquan 4 |
| 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,CAS and MWR,712100,Yangling,Shaanxi;2.Graduate University of Chinese Academy of Sciences,100049,Beijing;3.Northwest Science and Technology University of Agriculture and Forestry,712100,Yangling,Shaanxi;4.Yan An Vocational and Technical College,716000,Yan'an,Shaanxi:China |
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Abstract Ephemeral gully erosion is an important erosion type in Loess Plateau.Study of the hydrodynamic parameters of ephemeral gully flow is the base of establishing process-based or conceptual water erosion models.Hydrodynamic parameters were studied by scouring experiment on the slope of Yanergou watershed.It was concluded that ephemeral gully flow is turbulent flow,mostly is supercritical flow,and nearby the slope of 18° the power distribution of ephemeral gully flow was balanced between erosion and sediment transport,and nearby the slope of 26° the velocity and the stream power of ephemeral gully flow are the biggest and then this slope gradient is the best for the generation and development of ephemeral gully erosion.
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Received: 17 July 2007
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