| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 102 === Sound groundwater resources planning and management are lack in the Choushui River alluvial fan, resulting in the occurrence of serious land subsidence and seawater intrusion. Even the disasters induced by overpumping of groundwater pose a potential threat on the Taiwan High Speed Rail. In addition to improving the water resources management in the alluvial fan, the development of groundwater resources in the neighboring hills. Mingchu Basin, which is located on the midstream segment of the Choushui River and comprised of the gravel formation of Pleistocene, is an effective solution to resolve the problem in limited water resources. Because of wide drainage areas and good hydrogeological conditions, the Mingchu Basin is considered a high potential recharging region of groundwater. This work is to use the FEMWATER model equipped with the Groundwater Modeling System (GMS) to simulate the interaction of surface water and groundwater for specific three rainfall events. This study particularly focuses on the simulation of the groundwater flow, and evaluates the effect of different rainfall events on the groundwater recharge. The study results reveal that groundwater recharge and exchange are significant during the rainfall events and fast reduce after the rainfall events. The groundwater recharge is more easily fluctuated by the rainfall and soil water movement in the aquifer 1. The water movement in the vertical direction mainly occurs in the Mingchu Basin and apex of the Choushui River alluvial fan which located in the aquifer 2 and aquifer 3. The analyzed finding can provide residents with suggestive strategies to improve the water resources management. Government administrators with information of groundwater exchange between aquifers when plans of water resources are considered.
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