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年度	104	專案性質	實驗性質
專案類別	研究專案	研究主題	調查
申請機構	國立中央大學	申請系所	地球科學系
專案主持人	陳建志	職等/職稱	教授
專案中文名稱	應用自然電位法檢測迷失電流之研究
中文關鍵字	迷失電流,自然電位,腐蝕,互相關
專案英文名稱	Detecting stray current by using SP method
英文關鍵字	SP, stray current
執行金額	700,000元
執行期間	2014/12/1 至 2015/11/30
計畫中文摘要	本研究以數值模擬與砂箱實驗設計出一套以自然電位法偵測地下迷失電流源的分析 方法，闡述自然電位法應用在環境監測之可行性及優勢。第一階段的污染擴散砂箱實驗 中，同時以地電阻影像法及自然電位法進行量測，成果說明地電阻影像法較適用於單次 的調查與 time-lapse 的研究分析；自然電位法則適用於長時間的「觀察監測」。地電阻影 像法應用在環境調查上，電性差異約需 20 %以上較能反應出現象的改變；自然電位的原 始數據則具有偵檢環境中微小事件發生的能力。第二階段以自然電位法於人造迷失電流 之砂箱進行實驗，資料逆推演算後的成果可使用電位分布的具體影像及電流密度量指出 迷失電流源的位置。地電阻影像法是目前最常應用於協助土壤及地下水污染問題的地球 物理探勘技術，而自然電位法量測之設備與地電阻影像法相似，因此具有同時收集電阻 率及自然電位兩種資料之可行性，本研究成果擴大了地球物理探勘技術中電測法在土壤 及地下水污染之應用層面，除了研判污染分布之外，還可偵檢可能潛在的迷失電流問題， 亦有助於長期地下水管理之成效落實。
計畫英文摘要	This study proposes an innovative idea by applying the self-potential (SP) method to detect stray currents throughout the implement of numerical simulations and sandbox experiments. This research also expounds the feasibility and advantage of SP for monitoring in the field. We have conducted the sandbox design, literature and theory review, preliminary simulations on electrical resistivity imaging / tomography (ERI / ERT), together with laboratory sandbox experiments for various conditions of contaminants. The results of experiments illustrated, while the ERI is good for site investigation and time-lapse comparison, the SP method is preferred in the long-term monitoring. Importantly, the criterion for the ERI application could be the contrast in the resistivity larger than 20%. On the other hand, the SP method is capable of detecting a small environmental event in magnitude. We have applied the SP method for synthetic stray currents in sandbox experiments. The results of inversion showed the position of stray currents can be imaged by the electrical potential distribution and current density. ERI is the most popular approach to survey the issue of soil and ground-water contamination. The instrument of SP method is similar to ERI, therefore it also has feasibility to measure the signals of ERI and SP at the same time. The results of this study extend applied range of the electrical methods in geophysical exploration for the problem of soil and ground water pollution. It not only determines the pollution distribution but also detects the potential problem of stray currents benefiting the management of potential leakage of petroleum and natural gas.