In order to solve the problems on similitude law existing in simulative experiment for controlling(hydraulic) erosion in small watershed of Loess Plateau in China,the authors analyze the characteristics of(hydraulic) erosion in small watershed of Loess Plateau,give the basic similitude criteria and scale expressions for physically simulative experiment according to principles of hydromechanics and similarity theory.The results indicated that the basic water movement is turbulent flow and follows sediment-tr...
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