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頁籤選單縮合
題名 | In-Situ Determination of Field-Scale Dispersion Coefficients in Saturated Fractured Formations=飽和破碎層中現地延散係數之現場測定 |
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作 者 | 衛紹騏; | 書刊名 | 農業工程學報 |
卷期 | 38:1 1992.03[民81.03] |
頁次 | 頁1-11 |
分類號 | 443.67 |
關鍵詞 | 延散; 係數; 破碎層; 現地; 現場; 測定; 飽和; |
語文 | 英文(English) |
中文摘要 | 研究地下水污染的傳動問題中,延散係數為一重要之水力參數,通常在實驗室所量測體之延散係數遠較現地所量測之延散係數為小。 本文目的在闡明使用de Josselin de Jong之理論及現地追蹤實驗方法來決定飽和破碎層中之現地延散係數,此方法需在地層上游建立一注入井,並在下游至少設置一觀測井。在觀測井量測注入井注入之追蹤劑的濃度變化,可以繪成一時間--濃度之特性曲線,藉由該特性曲線以求得現地之延散係數,本方法之特點為: (1)本追蹤試驗使用地下水之天然水力梯度,在試驗中不回注或抽取,以免造成人工水力梯度。 (2)本方法不僅可測定縱向延散係數,亦可測定橫向延散係數,及兩者間之方向性關係。 本方法成功的應用在美國華盛頓林肯郡之現地追蹤實驗之井群中。 |
英文摘要 | One of the most important hydraulic parameters in dealing with the transport of contaminants in groundwater is dispersivity. The laboratory-measured dispersivity on a core is usually orders of magnitude smaller than the field-scale dispersivity. This paper presents a field tracer test method, using the theory of de Josslin de Jong, to determine field-scale dispersion coefficients in saturated fractured formations. The method requires one upstream injection well and at least one downstream observation well. The characteristics of the time-concentration curve observed in the observation well, as the result of a tracer released in the injection well, are used to analyze for dispersion coefficients. The important aspects of this method are (1) the tracer test is performed in a natural groundwater system, with no induced injection or pumping during the test; (2) the method will provide information not only on longitudinal dispersion coefficient, but also on transverse dispersion coefficient, and the directions of each. The method was successfully applied in a tracer test performed on a research well field near Creston in Lincoln County, Washington, U.S.A. |
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