礁溪有重要的溫泉自然資源，根據研究，礁溪近年來出現溫泉範圍縮小且水溫、水位下降的警訊。由於觀光人潮逐年增加，目前已超過100家溫泉業者進駐，溫泉總使用量已超出經濟的安全出水量。本研究透過溫泉監測，進行地溫分布之趨勢分析，可以了解礁溪溫泉區之地溫變化，並進行溫泉資料庫之建立，以掌握礁溪溫泉的地下溫度並觀測其發展趨勢。本研究主要是從民國100年~104年間，原則上每半年量測一次地溫，對礁溪之13口監測井，每5公尺進行井溫垂直監測，原始數據再經標準化，採同一口井、同一深度、不同年份的數據，使用Mann-Kendall法得到溫度曲線，進行趨勢統計分析。研究結果顯示，地下溫度趨勢與有關的水文地質條件和地下水流場有關，而地下熱水的水流受開發之溫泉井之深度和分布所影響。礁溪溫泉區核心地區（上游）整體以溫度升高為主，此核心區亦為抽水井分布最多的地區。但此核心區淺層溫度降低，可能因為溫泉井集中於20-60公尺處抽水，導致上層冷水往下流。而中下游溫度普遍有降低的趨勢，應是當核心區大量抽水時，造成外圍區冷水流入，所以外圍區呈現地溫下降趨勢。 Jiaosi has important hot-spring natural resources. According to the study, Jiaosi hot-spring has problems about the decrease in the water temperature, the water level and the range in recent years. For tourists is increasing, Jiaosi hot-spring has exceeded its security utilization limitation. This study is focus on the subsurface temperature distribution and variation to provide a reference in managing hot-spring resources in Jiaosi Area, Taiwan.The monitored data is from 2011 to 2015 period, every six months, from drill hole measuring, adopt the same well, different year, same depth. The temperature curve was obtained by using the Mann-Kendall method that we have the chart to gauge the subsurface temperature distribution and variation.The study results showed that the underground temperature trends are related to hydrogeology and the flow filed of groundwater. The groundwater flow directions are impacted by the exploitation of thermal water in production wells, accroding to their depths and distribution. Jiaosi hot-spring core area (upstream) is high temperature trend as a whole and it also has the most of the pumping wells. But this core area of shallow is reduced the temperature, probably because of spring wells in 20-60m place pump, leading to upper cool water down stream. Middle and lower stream’s temperature has downward trend generally, probably because of large amounts of water is pumped in core area.
