由於台灣降雨分佈不均、洪枯期流量變化大、地形陡峻的因素，許多降雨因此無法有效儲蓄而造成許多水資源流入大海，使台灣成為雨量充沛卻又缺水的國家。根據資料統計，台灣地區的水資源有30%來自於地下水，其中又以屏東平原的地下水抽取量最大。在長年超抽地下水的情況下，已造成沿海地區出現海水入侵的情形。本研究使用SUTRA 三維地下水流變密度溶質傳輸模式，對屏東平原海水入侵進行數值模擬，並探討不同整治計畫對改善海水入侵的影響。
根據水利署資料，海水入侵於屏東平原各地的惡化程度不一，因此整治計畫的擬定須因地制宜而有所安排。由本研究的模擬結果顯示，在補注水量有限(0.6cms)情況下欲改善屏東平原海水入侵，於崎峰至大庄之間的沿海配置抽水井抽取地下水可提升整治海水入侵的效果，於東側的沿海配置抽水井則會使地下水位降低，造成內陸地區遭到海水由下方入侵。而在補注水量充足情況下(1cms)，僅需於內陸地區設置補注井即可大輻度的將海水往海側退去。由此可知，補注量的多寡對改善海水入侵有決定性的影響，因此可開發人工湖或調整池等蓄水設施，以提供穩定且充足的補注來源。

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.

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