環保專案成果報告查詢系統

專案計畫編號	EPA-99-G103-03-A236-14
經費年度	099
計畫經費	976 千元
專案開始日期	2010/12/29
專案結束日期	2011/12/28
專案主持人	陳家洵
主辦單位	土污基管會
承辦人	尤衍翔
執行單位	國立中央大學應用地質研究所
專案分類	土壤及地下水
中文關鍵字	多深度微水試驗，水力傳導係數，測試段長度
英文關鍵字	mulilevel slug test, hydraulic conductivity, test section
協同主持人
共同主持人
計畫聯絡人	林雅停
計畫聯絡電話	03-4227151#65852
計畫聯絡信箱	111110stop@yahoo.com.tw

中文摘要	台灣平原地區含水層多屬沖積層，由不同水力傳導係數(K)之地質材料組成。水力傳導係數因地質材料空間變化所產生的異質性，K(x,y,z)，影響地下水流場、污染物溶解相流布、及非水相液體遷移甚巨。污染整治成效不彰非因整治技術的物、化反應失靈，而是場址水文地質特徵不明所致。近年科學研究與實務經驗均顯示污染場址中的低K區是整治瓶頸，故場址調查應使用三維技術以界定場址中的高、低K區範圍與位置以有效設計整治方案。多深度微水試驗(multilevel slug test, MLST) 是一種單井雙封塞技術，可以有效決定測試井周圍含水層不同深度的水力傳導係數，K(z)。於場址中不同位置的監測井執行MLST則可獲得場址的K(x,y,z)。MLST特別適合污染場址因為此項技術(1)不需抽水因而沒有污染水處理問題，(2)產生的地下水壓力變化相當小不致影響場址地下水流場也不會干擾污染物濃度分布，(3)省時易於執行。雖然MLST在國、內外已被廣泛使用，我們近年使用顯示測試段(雙封塞之間的透水段)的長短對K值推估有相當程度的影響。基本上，測試段越長所得K(z)解析度越差，測試段長度超過一定限度所得K值的垂直平均效應會過大而喪失特定深度的代表性，無法可靠反應異質性。減少測試段長度增加K(z)解析度，但加重MLST的工作量，增加場址調查成本。本計畫的目的是研究多深度微水試驗測試段長度對K(z)推估的影響，評估在同ㄧ口井中不同測試段長度所得之K(z)的相關性，探討在不同的水文地質情況下是否可用一個標準測試段長度來決定可靠的K(z)。本計畫成果對MLST實際執行有益，減少場址調查成本又能確保推估品質，對未來執行細則的制定亦有幫助。
中文關鍵字	多深度微水試驗，水力傳導係數，測試段長度

中文摘要

台灣平原地區含水層多屬沖積層，由不同水力傳導係數(K)之地質材料組成。水力傳導係數因地質材料空間變化所產生的異質性，K(x,y,z)，影響地下水流場、污染物溶解相流布、及非水相液體遷移甚巨。污染整治成效不彰非因整治技術的物、化反應失靈，而是場址水文地質特徵不明所致。近年科學研究與實務經驗均顯示污染場址中的低K區是整治瓶頸，故場址調查應使用三維技術以界定場址中的高、低K區範圍與位置以有效設計整治方案。多深度微水試驗(multilevel slug test, MLST) 是一種單井雙封塞技術，可以有效決定測試井周圍含水層不同深度的水力傳導係數，K(z)。於場址中不同位置的監測井執行MLST則可獲得場址的K(x,y,z)。MLST特別適合污染場址因為此項技術(1)不需抽水因而沒有污染水處理問題，(2)產生的地下水壓力變化相當小不致影響場址地下水流場也不會干擾污染物濃度分布，(3)省時易於執行。雖然MLST在國、內外已被廣泛使用，我們近年使用顯示測試段(雙封塞之間的透水段)的長短對K值推估有相當程度的影響。基本上，測試段越長所得K(z)解析度越差，測試段長度超過一定限度所得K值的垂直平均效應會過大而喪失特定深度的代表性，無法可靠反應異質性。減少測試段長度增加K(z)解析度，但加重MLST的工作量，增加場址調查成本。本計畫的目的是研究多深度微水試驗測試段長度對K(z)推估的影響，評估在同ㄧ口井中不同測試段長度所得之K(z)的相關性，探討在不同的水文地質情況下是否可用一個標準測試段長度來決定可靠的K(z)。本計畫成果對MLST實際執行有益，減少場址調查成本又能確保推估品質，對未來執行細則的制定亦有幫助。

中文關鍵字

多深度微水試驗，水力傳導係數，測試段長度

類型	檔名	檔案大小	說明	最新版公開日期
期末報告	EPA-99-GA103-03-A236-14_多深度微水試驗測試段長度對水力傳導係數推估之影響.pdf	4MB		2012/3/1 上午 12:00:00

摘要	Aquifers in the alluvial or fluvial plains of Taiwan consist of geological materials of different hydraulic conductivity (K). Aquifer heterogeneity concerns the spatial variability of K(x,y,z) due to the spatial distribution of geological materials. Heterogeneity significantly influences groundwater flow fields, distributions of dissolved contaminants, and pathways of nonaqueous phase liquids. Unsuccessful remediation is usually not caused by failure of the physiochemical reactions of the remedial technology employed, but rather due to a lack of understanding of aquifer heterogeneity. Recent scientific research and practical experience all indicate that the low-K zones in a contaminant site are the bottleneck of remediation. Therefore, three-dimensional site investigation techniques should be used in order to effectively delineate locations of the high-K and low-K zones, which require different remediation measures. The multilevel slug test (MLST) is a single-well double packer technique, which is useful in estimating the vertical variation of hydraulic conductivity, K(z), of the geological materials surrounding the test well. Conducting MLSTs at different test wells in a site allows us to determine the three-dimensional K(x,y,z). MLST is particularly suitable for contamination sites as it (1) withdraws no groundwater so requires no consequential contaminated water treatment, (2) produces small pressure disturbance that would not alter the groundwater flow field and contaminant distribution, and (3) is easier and inexpensive to implement. In spite of the popularity MLST, our recent studies indicate that the test section length (the water intake length between the double packers) has significant impact on the estimation of K. In general, a longer test section length reduces the resolution of K(z) obtained, and too long a test screen length introduces too much vertical average effect to the estimates of K, resulting in insignificant depth-specific representation and inaccurate estimates of K(z). Reducing the test section length increases the resolution of K(z) obtained as well as the work load of MLST, and hence the cost of site investigation. The purposes of this project are: to study the influence of the test screen length on the estimates of K, to evaluate the correlation between K(z) resulted from different test section lengths, and to investigate whether or not a standard test section length is possible to yield reliable estimation of K(z) under different hydrogeologic conditions. Results obtained will be useful for an effective performance of MLST, for reducing the cost of site investigation while maintaining the quality of the work, and for the future technical guidance of MLST.
英文關鍵字	mulilevel slug test, hydraulic conductivity, test section

摘要

Aquifers in the alluvial or fluvial plains of Taiwan consist of geological materials of different hydraulic conductivity (K). Aquifer heterogeneity concerns the spatial variability of K(x,y,z) due to the spatial distribution of geological materials. Heterogeneity significantly influences groundwater flow fields, distributions of dissolved contaminants, and pathways of nonaqueous phase liquids. Unsuccessful remediation is usually not caused by failure of the physiochemical reactions of the remedial technology employed, but rather due to a lack of understanding of aquifer heterogeneity. Recent scientific research and practical experience all indicate that the low-K zones in a contaminant site are the bottleneck of remediation. Therefore, three-dimensional site investigation techniques should be used in order to effectively delineate locations of the high-K and low-K zones, which require different remediation measures. The multilevel slug test (MLST) is a single-well double packer technique, which is useful in estimating the vertical variation of hydraulic conductivity, K(z), of the geological materials surrounding the test well. Conducting MLSTs at different test wells in a site allows us to determine the three-dimensional K(x,y,z). MLST is particularly suitable for contamination sites as it (1) withdraws no groundwater so requires no consequential contaminated water treatment, (2) produces small pressure disturbance that would not alter the groundwater flow field and contaminant distribution, and (3) is easier and inexpensive to implement. In spite of the popularity MLST, our recent studies indicate that the test section length (the water intake length between the double packers) has significant impact on the estimation of K. In general, a longer test section length reduces the resolution of K(z) obtained, and too long a test screen length introduces too much vertical average effect to the estimates of K, resulting in insignificant depth-specific representation and inaccurate estimates of K(z). Reducing the test section length increases the resolution of K(z) obtained as well as the work load of MLST, and hence the cost of site investigation. The purposes of this project are: to study the influence of the test screen length on the estimates of K, to evaluate the correlation between K(z) resulted from different test section lengths, and to investigate whether or not a standard test section length is possible to yield reliable estimation of K(z) under different hydrogeologic conditions. Results obtained will be useful for an effective performance of MLST, for reducing the cost of site investigation while maintaining the quality of the work, and for the future technical guidance of MLST.

英文關鍵字

mulilevel slug test, hydraulic conductivity, test section