利用雙井自然水力梯度施放溴示蹤劑探討淺層安山岩地下水系統

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Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/27694

Title:	利用雙井自然水力梯度施放溴示蹤劑探討淺層安山岩地下水系統 A Bromide Tracer Test for Shallow Groundwater Investigation in Andesitic Rock Formations, the Tatun Volcano Group, Taiwan
Authors:	郭欽慧
Contributors:	地質學系
Keywords:	氫氧同位素地下水大屯火山示蹤劑
Date:	2014-08
Issue Date:	2014-08-07 10:29:12 (UTC+8)
Abstract:	長久以來，因為火山區域之岩性不均勻之天性，其地下水系統原本就比未固結沉積物還複雜而難以掌握。近年來我們藉由地下水體氫氧同位素分析和水位與水溫分布，已經初步掌握與了解在大屯火山地區之地下水，大致可以將本區之淺層地下水分成兩大區塊，北磺溪與南磺溪流域。南磺溪流域大致上由北往南流而北磺溪流域大致上游南往北流。本計畫除了持續收集大屯火山地區之地表水與地下水樣並分析其氫氧同位素值之外，為了掌握地下水在區域岩層中之行為，將選兩個區域利用自然水位坡度先行進行井與井之間示蹤劑施放來探討大屯火山區域淺層岩石水層中的地下水流動途徑並進一步建立區域地下水的流動模式，經初步測試，我們目前選擇以非反應式之溴示蹤劑為本計畫之示蹤劑。我們分別選北磺溪與南磺溪流域各一條測線施放溴示蹤劑，預估施放2次，估計一次完整施放需耗時2-3個月。本校具有地利之便，以及本系已建置一套水氣氧同位素儀器（Picarro Isotopic Water Liquid Gas Analyzer L1102-i）和四組地下水微量追蹤量測器(Temphion Submersible Smart pH/ISE/Redox Sensor)，其中溴的解析度可達0.01ppm。更重要的是我們已經有了初步經驗於地下水井中施放與收集溴示蹤劑。我們希望透過密集量測在不同地質岩層中地下水、溪水、以及泉水中之18O 與D值並同時在井下施放溴示蹤劑來進一步瞭解地下水在安山岩區的循環機制行為與地下水流動模式，並利用本計劃的機會提供研究生與大學生對地科環境的訓練，而且也希望本研究的結果能提供有效的訊息給予大屯火山監測之用與溫泉水資源與國家公園之管理的重要訊息。 This proposal is aimed to be the pioneer study in hardrock groundwater region for tracer test. We intend to conduct inter-well natural gradient tracer test in two regions in the Tatun Volcano group. Tracer tests will be conducted in two watersheds at two different periods, dry and wet, using multiple-well natural-gradient tests method. One is in the same geologic formation, TB-MW26 to 30. The other one, TB-MW-11 to 25, will cross two different geologic formations. These two different settings can provide the most complete and best-quality information and best suited for environmental tracers. We also possess several advantages to enable us to propose this project, the location of our department, well-equipped instruments and experience. First, we have acquired and installed a Picarro Isotopic Water Liquid Analyzer L1102-i to enable us to measure water samples in the adesitic volcanic bedrocks. Secondly, we have purchased and well tested 4 sets of AquiStarmTempHionTMS mart Sensor which is a submersible water quality sensor and data logger for tracking pH, specific ions, redox, and temperature. The bromide concentration can be detected as low as 0.01ppm. Finally, we are located right nearby the study area and we have done preliminary studies on bromide tracer test in wells. It allows us to sample effectively whenever it necessary. We hope this project will serve as a platform for training students on sampling and measurements skill in hydrogeological parameters.
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