屏東地區於1995年開始建立分層觀測井，發現沿海部分地區有地下水鹽化的現象，後續研究提出鹽化的機制有兩種可能：現代海水入侵或是古海水殘留。本研究目的，使用海水及觀測井垂直井溫，以2D溫度模擬，探討海水入侵的速度及溫度變化。首先根據地下水位觀測資料選定海水入侵的流線，選定位於流線附近的觀測井，量測垂直井溫(temperature depth profile)，然後進行2D溫度傳遞模擬(heat transfer simulation)，本研究首次以溫度法提供另一種證據來了解鹽化之可能原因。另外也利用垂直溫度剖面，分析四個含水層是否有垂向的交換，嘗試從溫度傳播的機制來探討該地區地下水鹽化之可能原因及流場，其結果有助於保育該地的地下水資源。 There were salty groundwater along some of coastal line in Pingtung, southern Taiwan after the monitoring wells were constructed since 1995. The researchers suggested two theories for the groundwater salinization mechanism: modern seawater intrusion or paleo-seawater in the aquifers. This study using a 2D numerical temperature model based on temperature-depth profiles to simulate the velocity of seawater intrusion and its temperature change. The flow path of seawater intrusion will be defined by using the hydraulic heads. The temperature-depth profiles will be collected in those monitoring wells along the flow path. Also, the vertical flux between the four aquifers will be discussed by using temperature-depth profiles. This study is the first to use temperature data to discuss the mechanism of groundwater salinization in the Pingtung area. The results of this study will help to understand and predict the distribution of salty groundwater.
