| Summary: | 碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 92 === The main purpose of this study is to investigate the
relationships among ion concentration 、 electrical
conductivity (EC) of groundwater and debris flow occurrence. During typhoon season, very frequently, heavy rainfall resulted in the rise of groundwater table, unstability and the failure of the slope. Accordingly, in this study, the test site was investigated and flumes for seepage flow tests were designed.
The site of this study was selected at Ba-Dou-Tze in Keelung. Therefore, the soil samples for the tests were collected from the site. After the soil samples were prepared in the flumes, the seepage flow and slope stability tests were then conducted to investigate the variation of the ion concentration and the electrical conductivity (EC) of groundwater while the soil slopes failed. Meanwhile, the feasibility for observing the ion concentration and EC of groundwater was also evaluated. The results showed that while the groundwater table increased before the soil slope failed, the concentration of SO42- and Mg2+ increased, however, the concentration of Na+ decreased.
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