圖書典藏及影音數位平台

伏流水資源是為可供開發水資源（多元水資源利用）之一種，可作為因應氣候變遷下加強穩定水資源供水能力策略之一。為了提高伏流水應用，將依伏流水實質物理特性進行探究，透過多面向調查成果，以科學論證方式探究地面水與伏流水（潛伏流）關係，若伏流水（潛伏流）為與河川水(或地面水體)緊密互動之河川下或河川鄰近地面下之水體，其地下水體存在與流動主要受河川水影響，其使用屬於河川性狀性質者，將依科學論證結果定義伏流水(包含潛伏流)範圍，擴大伏流水使用。沖積平原的中上游通常地質材料透水性高，因此補注條件佳；當地下水流動由扇頂區進入扇央區之交界處或山麓帶與平原區交界處常出現湧泉（地下水出滲地表），該區域往往是地面水與地下水交換區域。本計畫將透過一系列調查方法（文獻資料分析、現地觀測、地球物理探查法等等）來分析評估平原地面水與地下水之間具有高度關連性之區域，圈繪出具有伏流水（潛伏流）潛勢區（潛勢帶），後續針對開發量以及取水後之影響進行分析評估。

Due to climate change and the rapid growth of Taiwan’s domestic economy—particularly the semiconductor industry—the demand for stable water supply has increased significantly in recent years. In response, the Water Resources Agency (WRA) of the Ministry of Economic Affairs has developed a substantial amount of bank filtration water in accordance with Article 2 of the Enforcement Rules of the Water Act. Operational results over the past few years indicate that bank filtration has provided significant benefits for both regular water supply and emergency situations, such as high turbidity in surface water and severe droughts. Therefore, it is necessary to expand the utilization of bank filtration water within environmental capacity limits to enhance regional water resource resilience. Accordingly, the objective of this project is to scientifically justify, from a water resource management perspective, an expanded definition of bank filtration zones. Based on the d definition and supplemented with existing and newly collected data, the project will identify potential bank filtration areas, assess their potential capacity and extraction impacts, and propose amendments to current bank filtration regulations. The scope of work consists of four major components: 1. Compilation of existing data, including geomorphology, river and groundwater hydrology, surface and groundwater quality, paleo-channel mapping, and information on nearby existing or planned intake facilities and extraction volumes. 2. Field investigations, focusing on areas identified as data-insufficient and with high development potential based on Task 1. Work includes groundwater drilling, pumping tests, installation of temporary monitoring wells, temporary river discharge stations, surface and groundwater quality sampling, riverbed hydraulic conductivity testing, and 2-D electrical resistivity surveys.3. Construction of hydrogeological models using both compiled and newly collected data to determine bank filtration potential zones with strong surface-groundwater interaction. 4. Integration and assessment of all results using groundwater numerical modeling to evaluate potential extraction capacity and associated impacts, and to propose regulatory revisions and future water supply strategies. The project area covers the Lanyang Plain (Yilan River, Lanyang River, and Luodong River), the Pingtung Plain (Gaoping River, Ailiao River, Laonong River, and Linbian River), and the eastern region (Beinan River). Tasks 1 through 3 were completed prior to the mid-term phase; this final report summarizes the work contents and results primarily associated with Task 3.