| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 99 === Guandu plain is located in northern Taiwan, where is an alluvial plain and few complete wetland system in Taiwan. Previous studies indicated that arsenic (As) concentration of geothermal spring in Beitou area was up to 4.6, significantly exceeding the World Health Organization (WHO) maximum contamination limit (MCL) of 0.01 in drinking water. High As contents may move by groundwater to downstream of coastal plain, wetland, and estuary ecosystem, causing the concern of the domestic safe use of spring water and the potential hazard of ecological environment. The objective of the study is to develop a hydrogeologic model of Guandu plain using MODFLOW and to estimate the flow path of arsenic in groundwater using MODPATH. The simulated groundwater level is calibrated and validated against the measured groundwater level with the root mean square error (RMSE) of 0.778m and the R-square is upon 0.9994 that is extremely significant. The analyzed results show that groundwater flow direction is from the northeast to the southwest which water table decrease with terrain. Furthermore, we estimated that the flow path of arsenic in groundwater was from Huang Gang creek to Guandu plain , and thus requires further research and discussion.
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