溫泉是礁溪最重要的自然資源，但近來已出現重大危機。根據學者研究，礁溪溫泉範圍縮小且水溫、水位下降，當地100多家溫泉業者，溫泉總使用量平日約3000CMD 以上，但旺季假日則高達16000CMD，溫泉開發量可能已超出經濟的安全出水量。本研究將對業者的抽水行為進行探討，以瞭解抽水井密度，以及抽水量最多的時段及季節是否有差異？以提供溫泉資源永續經營的參考。本研究的日干擾量（即「每日最高及最低的水位差」）是指監測井本身不抽水，但每日仍出現水位變動，即是受到鄰近井抽水的影響。藉由每半小時一筆的數據，連續監測水位資料，分析2013年礁溪8口監測井的日干擾量，來瞭解鄰近井的抽水行為。本研究發現當地有集中抽水的情況，上游區域抽水井最密集，佔全區55%，導致監測井所受的干擾程度較大，其中又以太子井的日干擾量最高，推測此井因位礁溪溫泉區中心，附近抽水井數量較多，故受影響程度也最大；下游區域溫泉井只佔全區1%，日干擾量也下降至20～40cm。另外，最低水位大多出現於21:30到凌晨0:30之間，表示這段時間的抽水量最多，可能因為住宿遊客以夜生活為主，泡溫泉的時間多集中在半夜。最後，日干擾量較高的季節，以春季及秋季的累計天數為多，此結果與一般大眾認知的冬季氣溫低，泡湯遊客較多的結果不同，可能冬季受東北季風影響，氣候溼冷，造成民眾到此遊玩的意願較低，而春季和秋季的氣候宜人，遊客數量反而較多，故抽水量較高。 Hot spring is the most important natural resource for tourism in Jiaosi. However, according to the previous studies, declining water pressure and temperature in hot spring water resources in recent years. There are more than 100 hot spring spa houses in Jiaosi with a total of approximately 3000CMD of hot water withdrawn during weekdays. In peak seasons and holidays, the amount of hot water usage up to 16000CMD. The usage amount of hot spring might exceed the economical safe yield. The purpose of this research is to investigate hot water usage behavior of the spa house for understanding the distribution of production wells, and to know if the period of the maximum amount of pumping would be related to the varied seasons. This will provide a reference to maintain the sustainable operation of hot spring resources.The daily interference drawdown (DID) is the pressure difference between the highest and lowest water pressure in one day in the monitoring well. The DID usually caused by the withdrawing of nearby wells. I use data from eight monitoring wells with water pressure recorded in a half hour interval in 2013.The results show that 55% of the production wells are located in the upstream areas which have higher DIDs with highest value in the Tai-Zhi well. However, only 1% of the hot spring wells are in the downstream areas. Therefore, the DIDs declined to 20~40cm. Moreover, the minimum water level occurred mostly during the period from 21：30 to 0:30 in the morning, which implied that most hot water was withdrawn during the night time. The tourists tend to do activities and enjoy spa at night. Finally, the DIDs were higher in spring and autumn, rather than in winter that I assumed more spa tourists in winter because of low temperature. In winter, the Northeast monsoon results in humid weather which makes people unwilling to go sightseeing; on the contrary, the pleasant weather in spring and autumn attracts more tourists. As a result, the amount of pumping in spring and autumn is higher than that in winter.
