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題名 | Identifying Groundwater Contaminant Source Characteristics Using Simulated Annealing=模擬退火演算法推求地下水污染源位置及釋放歷程 |
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作者 | 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183-188 |
分類號 | 445.259 |
關鍵詞 | 地下水; 污染源鑑定; 釋放歷程; 模擬退火演算法; 最佳化; Groundwater; Source identification; Release history; Simulated annealing; Optimization; |
語文 | 英文(English) |
中文摘要 | 一般而言,當監測井發現污染物存在時,污染源的位置、釋放濃度的大小、及釋放的時間,為地下水污染整治工作中,需要得知的資訊。以監測井中量測得的污染物濃度,推求污染源的問題,稱為污染源鑑定問題。本研究發展一個污染源鑑定方法,利用模擬退火演算法配合二維的地下水污染物傳輸的解析解,藉由監測井中的污染物濃度,推求污染源的位置、釋放濃度、及釋放時間。所採用的二維地下水污染物傳輸解析解,可描述一個污染源於某位置瞬間釋放後,其污染物於時空上的濃度分佈。 在模式發展階段,先於某一地點,假設瞬間釋放污染物兩次藉由二維污染物傳輸的解析解,模擬計算各個監測井中的污染物濃度,並將此濃度視為其監測井中量測得的污染物濃度值。理論上,若模擬退火演算法所求得的最佳解,與真正污染源的位置、釋放濃度、及釋放時間相近時,則此時以解析解所模擬的污染物濃度,與量測的濃度其誤差平方和會為最小。在本研究藉由兩個案例分析,展示所發展方法的分析結果,結果顯示在污染源的鑑定工作中,需謹慎選取監測井內的採樣濃度及監測井位置,以推求得較佳的污染源相關特性。 |
英文摘要 | In the real world, in case a high contaminant concentration is detected at monitoring well, the source location and release history are important information and need to be known. This kind of locating the unknown source is an inverse problem and may be called as source identification. The objective of this study is to develop an approach to determine the source location, magnitude of release concentration, and release time by minimizing the sum of square errors between the simulated concentrations and sampling concentrations at the monitoring wells.Simulated annealing and a two-dimensional analytical solution are the main tools in the proposed approach.The analytical solution is derived based on groundwater transport equation with a point source instantaneously injected into a two-dimensional homogeneous aquifer. The contaminant is assumed to release at known source location and release strength. After a specified period of time, the plume concentration (hereafter called sampling concentration) at monitoring wells can then be obtained from the analytical solution and is used to identify the contaminant source. All results obtained from the proposed approach indicate that source location can be determined exactly.However, the accurately release history depends on the selected monitoring well, which should detect sensible level of plume concentration. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。