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題名 | 一維地下水密度變化之海水入侵數值模擬=Numerical Simulation of One-Dimensional Sea-Water Intrusion with Variable Density Groundwater Flow |
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作者姓名(中文) | 葉一隆; 林俊男; | 書刊名 | 農業工程學報 |
卷期 | 43:2 1997.06[民86.06] |
頁次 | 頁29-38 |
分類號 | 351.85 |
關鍵詞 | 地下水密度流; 海水入侵; 溶質傳輸; Groundwater flow with variable density; Sea-water intrusion; Solute transport; |
語文 | 中文(Chinese) |
中文摘要 | 海水入侵之探討,依處理海水與淡水介面之不同,可分成兩類。一視淡水與海水 為不相溶之明顯介面,另一則視淡水與海水介面因延散作用而成為一混合區。本文以後者為 基礎,考慮海水為一污染之溶質,但在其傳輸過程中,因淡水與海水互溶必產生密度變化。 本文建立地下水流因溶質加入致使密度產生變化對地下水流與溶質傳輸影響之一維數值模式 。此數值模式係以有限差分法建立。若密度為定值,則本數值模式已驗証與解析解相吻合。 利用本數值模式模擬一維地下水密度流之海水入侵問題,結果顯示在相同邊界條件與相同位 置,在流體密度受溶質濃度影響之範圍內,實際之水力水頭所得結果為不考慮密度影響所得 值較考慮密度影響所得值為大,當時間為 100 天時,其最大相差為 2.4%。而鹽份濃度分佈 之模擬結果考慮密度影響所得值較未考慮密度影響所得值為小, 當時間為 100 天時,其最 大相差值達 75.3%。另由模擬結果亦顯示,當海水入侵區範圍愈大時,淡水與海水之混合區 亦愈大。 |
英文摘要 | The analyses of sea-water intrusion can be separated into two categories, depending on how they deal with the mixing process. The sharp-interface models assume that no mixing between sea-water and fresh-water, and the dispersive-interface models assume that the presence of a transition zone between two regions of water where is due to dispersion. In this paper the sea-water is regarded as a contaminant source. To simulate the solute transport and groundwater flow with density-dependent that varied due to the contaminant migration process. An one-dimensional numerical model by finite difference scheme is developed with density-dependent to simulate the groundwater flow and solute transport in porous media. The results computed by numerical model are excellent agreement with the analytical solutions with the same conditions. This model is used to simulate one-dimensional sea-water intrusion with variable density groundwater flow. The results show that the actual hydraulic head computed by density-independent model is greater than that computed by density-dependent model at the same location and the same boundary conditions in the density affected zone. For a 100 days period simulation, the maximum difference is approximately 2.4%. The simulation also shows that the salt concentration computed by density-independent model is greater than that computed by density-dependent model. For a 100 days period simulation, the maximum difference is approximately 75.3%. In addition, the mixing zone of fresh-water and salt-water is increased when the salt-water intrusion area is increased. |
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