Study on groundwater pollution processes in a mountainside slope caused by illegal waste disposal

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Illegal waste disposal at the mountainside is one of serious problem in Japan. However, the conventional approaches to the groundwater pollution problem mainly focus on the urban area or flat land. In this study, 3D numerical simulations of the advection dispersion phenomena in the simple slope under cyclic rainfall were carried out to investigate the affects of hydraulic conductivity or geometric relation between the source area and pumping well. In addition, it was investigated that the change of water content and solute transport caused by rainfall infiltration in the model slope by experiment and numerical analysis.