碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 101 / Due to the uneven distribution of precipitation, large variation in river discharge between flood and drought periods, and the steepness of mountains in Taiwan, it is difficult to preserve rainfalls and in turn cause lots of water to discharge into the ocean directly. Thus, Taiwan is a country that is abundant in precipitation but lack of water resources. According to statistics, about 30% of water resources in Taiwan rely on groundwater, and the Pingtung Plain is the area with maximum groundwater pumpage. As a result of long term overpumping groundwater, seawater intrusion has occurred in coastal areas of the Pingtung Plain. This study applies SUTRA, a model developed for modeling the three-dimensional saturated-unsaturated variable-density groundwater flow with solute or energy transport, both to simulate the saltwater intrusion in coastal areas of the Pingtung Plain and to investigate the proposed strategies for improving saltwater intrusion.
According to the data of the Water Resources Agency, the extent of saltwater intrusion in the Pingtung Plain is various, so the strategies for saltwater intrusion improvement have to be adapted to accommodate local conditions. Simulation results reveal that, as water amount for recharging is limited, pumping groundwater along the coastline between Chifen and Dazhuang is able to increase the efficiency of saltwater intrusion improvement. For the eastern part, pumping groundwater in the coastal zone could decline the water table, and cause saltwater to invade inland from a lower position. As water amount for recharging is sufficient, installing injection wells inland alone could push saltwater intrusion seaward at a great distance. In light of these results, water amount for recharging serves as a decisive factor on improving saltwater intrusion. Therefore, as to alleviate saltwater intrusion, it is suggested to develop artificial lakes and reservoirs for providing steady and sufficient water amount of recharge.
| Identifer | oai:union.ndltd.org:TW/101NCKU5083005 |
| Date | January 2013 |
| Creators | Hung-YuTai, 戴宏育 |
| Contributors | Wei-Cheng Lo, 羅偉誠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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