Hydraulic Erosion Experimental Study On Geocell Reinforced Slope Protection

On the basis of consulting a large of literatures domestic and aboard, the slope erosion and dynamic characteristics about the overland sheet flow on the slope were reviewed. In this paper, aim at studying the hydrodynamic characteristics and slope erosion characteristics under geocell reinforced, combining with of simulation test and theoretical analysis method. The test research the changing about velocity, Reynolds number, Froude number, erosion etc. under the changing of the slope and flow. By means of the study the main results are listed as follows:1. Measuring the velocity by tracer method:flow velocity reduces with time, but is not decreasing; at the end of the test, flow velocity achieved a steady value. Under the same flow, in the early stage, flow velocity changes sharply as the slope gradient, at the end of the test, the changing is not significant; under the same slope, flow velocity changed a little.2. The change of the Reynolds number, Froude number and Resistance coefficient:Reynolds number and resistance increased with the slope gradient and the flow. In the opposite, Froude number decreases. In this paper, we judge the flow regime through the Reynolds number of silt dynamics. The result shows that it was in the turbulent flow state. Under the geocell reinforced, Resistance coefficient increases with the Reynolds number, and changes in the form of logarithmic relation. In the opposite, Froude number decreases, and changes in the form of cubic relation. As the geocell reinforced, the Froude number decreases and less than1, except5degrees and10degrees as the flow is 1m3·h-1. This result shows that the geocell reinforced slow down the flow.3. Measurement of erosion and sediment concentration:sediment concentration reduces with the time, but is not decreasing; at the end of the test, the sediment concentration stays stably. It increases with the slope, but the relationship is not sure with flow. Erosion increases with the time, but the trend decreases gradually. Although it increases with the slope and flow, the range decreases gradually.4. Relationship between the erosion and Reynolds number:erosion increase with Reynolds number, and as a logarithmic relationship.