Review on Hydraulic Characteristics and Erosion Dynamics of Overland Flow in Soil Erosion Process
土壤侵蚀过程中坡面流水力学特性及侵蚀动力研究评述

Soil erosion dynamic process is a complicated physical process in the interaction between water and soil, and sediment laden flow is the main dynamic of soil erosion, therefore, a better understanding of hydraulic characteristics and erosion dynamics on overland flow is the basis to research dynamics law of soil erosion. This paper discussed systematically and thoroughly hydraulic characteristics and erosion dynamics of overland flow including the aspects of velocity, water depth, water flow regime, resistance law, shear stress, scouring dynamics, kinetic energy research and the existing problems of research, furthermore, it also emphasized that water flow regime and slope status are so complicated as overland flow is a three dimensional, unsteady and non-uniform spatially varied flow that uniform flow theory could not reveal hydraulic characteristics and their change law of complex surface conditions in nature. Therefore, water movement, change law of hydraulic parameters and soil erosion processes on overland flow are important directions for research on hydrodynamics of soil erosion which is significant for further understanding internal mechanism of soil erosion hydrodynamic processes and construction of physical erosion model.