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題名 | Development of a Three-Dimensional Model for Determining a Constant Release Contaminant Source in Groundwater=應用三維地下水模式推求地下水污染源 |
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作者 | 張桐樺; 林郁仲; 葉弘德; | 書刊名 | 中國環境工程學刊 |
卷期 | 16:3 民95.05 |
頁次 | 頁189-194 |
分類號 | 445.259 |
關鍵詞 | 地下水; 污染源鑑定; 模擬退火演算法; Goundwater; MODFLOW-GWT; Source identification; Simulated annealing; |
語文 | 英文(English) |
中文摘要 | 本研究結合模擬退火演算法(simulated annealing, SA)與地下水流與傳輸模式MODFLOW-GWT進行污染源釋放位置、濃度及時間的推求。MODFLOW-GWT為美國地質調查局所研發,可進行三維地下水流與污染傳輸之模擬。為了推求地下水污染源,污染物在數個監測井中的觀測濃度是必要的。再發展階段,利用MODFLOW-GWT將整個含水層分為數層,得到不同深度的監測井中的污染物濃度(視為觀測濃度)。在污染源推求階段,將真實污染源及另一可疑污染源視為候選污染源進行推求,利用SA分別產生兩個候選污染源可能的釋放量及釋放時間(稱為試誤解),再以MODFLOW-GWT分別對每個試誤解進行模擬,得到監測井中的污染物濃度(稱為模擬濃度),藉由最小平方法,當觀測濃度與模擬濃度的誤差平方和最小時,即視為得到真實污染源的釋放濃度與時間。由數值模擬試驗可知,在推求過程中,若將含水層進行適當分層,將有助於真實污染源的推求。 |
英文摘要 | An approach using simulated annealing (SA) incorporated with the groundwater flow and transport model called MODFLOW-GWT is proposed to estimate the contaminant source location, release period, and release magnitude. The MODFLOW-GWT, developed by United State Geology Survey, can simulate three-dimensional groundwater flow and contaminant transport. In the development stage, the plume concentrations (herein called sampling concentration) in the monitoring wells at different depths are simulated using MODFLOW-GWT with known location (herein we called real source) and release strength and period. In source identification process, two candidate sources, including the real source and a suspicious source near the real source, are chosen. The SA is employed to provide the magnitude of release concentration from those candidate sources. Then the MODFLOW-GWT is employed to forward simulate the three-dimensional plume concentrations (herein called simulated concentration) in the monitoring wells. The location, release period, and the release concentration of the real source are determined by SA while minimizing the sum of square errors between the simulated concentrations and the sampling concentrations in the monitoring wells. |
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