七股鹽田濕地位於臺南市七股區，原為鹽業用地，總曬鹽面積達1976公頃，為全臺最大的曬鹽場。於2002年停曬後，因為其地理條件提供了大片水域，成為水鳥棲息、覓食、繁殖及過冬的重要棲地，並於2007年被評定為國家級重要濕地。由於原為鹽業用地，七股鹽田濕地設有水道連通西面的潟湖，並設有水閘門，同時濕地內的各區也皆有水道連通，可透過水閘門的開啟並配合外海的潮汐漲退，進行排水或引水。但自鹽田廢棄之後，原有的水門管理操作方案隨即失效，濕地內有著冬季時水量不足的問題，又或因長時間的日照曝曬而導致水體鹽分過高及水質不佳等不利鳥類利用的情形。
因此本研究嘗試探討不同的水門的操作策略下對於七股鹽田濕地環境品質之影響，期望透過地文性淹排水模式(Physiographic drainage-inundation Model, PHD model)與現地水門操作的方式，在不造成在地村莊淹水問題的前提之下，搭配水深及鹽度等現地調查，以找出建議的水門操作策略，利於日後對七股鹽田濕地環境品質的經營與管理。本研究進行了四次現地水門排水試驗及十四次水門引水模擬，引水情境設置包含：設置水閘門、河道清淤、水門清淤、開啟不同水門及是否排水。排水試驗結果顯示，水門的排水流量公式為Q=0.33bh√2g∆H。而引水模擬結果顯示，河道清淤的方案優於設置水門的方案，但在不考慮成本的前提下，最佳的水門操作策略為情境十三，其內容為設置三處閘門，接著清淤河道及水門口，再來同時開啟二處水門引水，待鹽田內的水深達到所設定的目標，再將鹽田及河道閘門關閉，之後利用水門將河道多餘的水排出。

Qigu Salt Pan Wetlands are located in Qigu District of Tainan City. They were originally used for the salt industry. The total area is 1,976 hectares, which is the largest salt pan in Taiwan. After stopping the work in 2002, because of its geographical conditions, it has provided a large area of water and has become an important habitat for waterfowl perching, foraging, breeding and wintering. In 2007 it was designated as a National Important Wetland. Because it was originally used for the salt industry, the Qigu Salt Pan Wetlands have connecting waterways and sluice gates which were used to allow salty water from Qigu lagoon into the salt pans. All areas in the wetland are connected by waterways. One can drain or divert water through the opening of water gates and use of the tides rising and falling in the open sea. However, after the salt pan was abandoned, the original water gate management operation plan was stopped. Since then, the wetland has had problems of insufficient water during the winter, and excessive salinity due to prolonged exposure to sunlight.
In order to find an appropriate new water management plan, this study attempts to explore the impact of different water gate operation strategies on the environmental quality of the Qigu Salt Pan wetlands. This research used the Physiographic drainage-inundation Model, local water gate operation, and local water quality surveys to identify a recommended water gate operation strategy which can facilitate the management of the environmental quality of the Qigu Salt Pan wetland in the future. In this study, fourteen water gate diversion tests were carried out. The factors to consider for different water diversion settings include: setting up water gates, river dredging, water gate dredging, opening different water gates and level of drainage. The diversion simulation results show that Situation 13 is the best option. This strategy can create a wide range of water habitats and three different water depths, while still allowing for flood control.

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