| Summary: | 碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 94 === The objective of this study is to investigate the relationships among the occurrences of landslides, slump type debris flows and the quality of groundwater in Nan-tou area. Soil samples for the tests were collected from Shen-mu and Fen-chiu in Nan-tou to prepare for the remodeled test with slope of 75˚ in a specially designed seepage tanks. A water supply system was used to control the pressure head to cause soil slopes to be failed, quality of groundwater and displacement of the soil sample were collected at the same time. The tests were then conducted to investigate quality of groundwater while the soil slopes failed.
The testing results showed that there is positive correlation among the concentration of EC and SO42- of the seepage water at downstream of the soil slopes. While the soil slopes failed, the threshold value of the concentration of EC and SO42- of the seepage water at downstream of the soil slopes were 39.2µs/cm and 9.98mg/L. The coefficient of determination among the vertical displacement of soil, horizontal displacement of soil and the concentration of EC of the seepage water at downstream of the soil slopes were 0.7220 and 0.8252, it means that the displacement of soil can be predicted by the concentration of EC of the seepage water at downstream of the soil slopes.
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