Analysis on the Effect of Soil Erosion Prevention Material within Stone Mattress Using Sediment Discharge Equation

Abstract

Soil erosion prevention material is installed inside stone mattress of revetment side to prevent plant rooting and soil loss. This material can be produced by processing coir, net and such, and plays a role to prevent soil loss, before plant rooting due to flow velocity interference, when using stone mattress construction method. The purpose of this study is to investigate and reveal the effects of soil constraints. Hydraulic impact depending on whether to have soil constraints was reviewed through hydraulic model experiment, based on slope and revetment conditions in the stream. By establishing model theory and building a model for accurate hydraulic model experiment, analysis on efficiency of soil constraint was conducted through hydraulic experiment under fixed riverbed condition and transporting riverbed condition.20m open channel experiment apparatus, installed in Incheon National University, was used for hydraulic experiment, and for maximum velocity, maximum flow rate was used in the laboratory to create the flow rate of flood in regular streams. Results of the experiments showed that, after installation of soil erosion prevention materials, maximum of 56.7% was constrained compared with initial sand height, and maximum of 37.3% under revetment condition. For slope condition, constraint rate was high at the bottom part of slope with the fastest flow rate. And under revetment condition, no significant difference was shown in all sections. As there are positive effects from soil erosion prevention materials on soil loss, it is determined that stone mattress will increase plant rooting ratio.