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年度	107	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	國立交通大學	申請系所	防災與水環境研究中心
專案主持人	林志平	職等/職稱	教授兼系主任
專案中文名稱	孔內電探法在土壤與地下水汙染調查與整治監控的技術發展
中文關鍵字	孔內電探監測技術; 土壤與地下水汙染整治
專案英文名稱	Development of Borehole Electrical Resistivity Tomography Technique in Monitoring the Investigation and Remediation of Soil and Groundwater Contaimination
英文關鍵字	Borehole ERT Monitoring Technique; Soil and Water Contaimination
執行金額	920,000元
執行期間	2018/1/10 至 2018/11/30
計畫中文摘要	近期國內土壤與地下水研究進入實場整治階段，整治藥劑的灌入狀況為整治成效的重要步驟，但在滲透性差之地層中，重力或加壓方式勢必造成整治藥劑僅會沿優勢流徑（如砂層）傳輸，除容易流失藥劑，亦無法改善已擴散進入坋黏土層之污染溶質，造成持久性污染而持續影響周遭地下水。為求有最佳整治效果，整治者可以根據藥劑擴散半徑適時調整整治參數達到最佳效益，所以對於藥劑灌入的傳輸路徑監測非常重要。在藥劑傳輸路徑的監測上，利用量測地層電學性質之地電阻影像探測法進行是極具效益的方法，將此技術搭配既有標準監測井進行孔內施測可有助解決其單在地表施測會有深度解析能力較為不足的問題，但其仍具有潛在影響解析問題尚待克服。因此本計畫之主要目的有二：(1)孔內地電阻影像探測法潛在問題成因數值模擬探討；(2)擬定抑制鏡像效應之資料收錄與分析方法。本年度研究結果透過數值模擬詳細的探討，發現造成結合井測產生鏡像效應的根本原因，基於這樣的發現，提出改善資料收錄與分析方法的手段包括聯合反演與加權模型疊加方法。在單孔施測方面，亦透過數值模擬探討指向性的問題，並提出搭配兩個地面電極強化指向性的施測配置方式。最後本研究於實場進行初步的現地測試，基於應用井孔之地電阻影像探測方法進行比較測試，初步結果顯示對於深部解析之提升確實有其效益，建議後續計畫進一步進行較完整的模場評估驗證，基於模場試驗中各種實務應用議題，以各方面之資訊驗證井孔相關分析與實務應用方法，並據以精進改善以達到高解析監測技術之目標。
計畫英文摘要	Currently the study of soil and ground water contamination in Taiwan has recently initiated in-situ remediation phase. The distribution of the chemical agents after injection is a key factor for the remediation effectiveness. In practice, however, injection into low conductivity layer (such as silt-clay layers) are difficult as most of the treating agents would most likely be dispersed into high conductivity layer (for example, sandy layers). Consequently the contaminant within silty or clayey layers could not be easily remediated and would continuously affect the underground water environment. In order to enhance site remediation effectiveness, site operators can adjust the parameters of the injection plan according to the in-situ monitoring result on the dispersed radius of chemical agents. Electrical Resistivity Tomography (ERT) is an effective geophysical technique to monitor the distribution of in-situ injection by measuring the electrical properties distribution of the underlying ground layers. Conducting both surface ERT and borehole ERT within existing monitoring wells can greatly increase the resolution in depth compared to conventional surface ERT survey, but it need to solve some problem such as mirror effect. Aim of this project is to 1. Study the potential problem of borehole ERT survey by numerical simulation; 2.Develope the data acquisition and analysis method of suppress mirror effect. This study finally establish analysis method such as combined inversion and weight model stacking method to enhance the benefit. This project eventually test in an in-situ site, by applying ERT to examine the in-situ application. The follow-up study recommend to evaluate in experimental site to enhance practical feasibility.