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- Effect of Spatial Variability of Hydraulic Parameters on Solute Transport in the Shallow Soil of the Chang-Hua Area
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題名 | Effect of Spatial Variability of Hydraulic Parameters on Solute Transport in the Shallow Soil of the Chang-Hua Area=淺層土壤水力參數空間變異性對溶質傳輸影響效應之研究 |
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作者 | 葉義章; 李振誥; Yeh, Yi-jang; Lee, Cheng-haw; |
期刊 | 中國環境工程學刊 |
出版日期 | 19990600 |
卷期 | 9:2 1999.06[民88.06] |
頁次 | 頁97-106 |
分類號 | 434.222 |
語文 | eng |
關鍵詞 | 空間變異性; 溶質傳輸; 未飽和層; Spatial variability; Solute transport; Unsaturated zone; |
中文摘要 | 水文地質中水力參數存在空間變異性,其影響著地下水流動及溶質傳輸之 行為。本文以彰化地區為實例研究地點,首先進行其淺層土壤水力參數的現地調查,分析求 得各參數的機率分佈函數與空間變異性,再利用蒙地卡羅模擬法及溶質傳輸序率模式,求得 溶質流經淺層土壤時之累積通量濃度的動態曲線,並與定率模式所得結果進行比較,來分析 探討地表補注率、飽和透水係數、飽和含水率、以及未飽和層深度等水力參數的空間變異性 ,對淺層土壤溶質傳輸之影響。研究結果顯示,彰化地區淺層土壤各種水力參數的空間變異 性確實對溶質傳輸存有明顯影響,其中以未飽和層深度之變異性對溶質傳輸影響最大,其次 為土壤之飽和透水係數的變異性,相對而言,地表補注率以及土壤飽和含水率等參數之空間 變異性,對溶質傳輸之影響效應則較不顯著。另外,研究結果也顯示,當地表補注率增加, 即愈趨近飽和動流時,土壤之飽和透水係數的空間變異性對溶質傳輸之影響愈趨顯著。 |
英文摘要 | The heterogeneous effects of spatial variablility of hydraulic properties on solute flux into groundwater in the unsaturated zone were observed for field-scale solute transport using stochastic methods. Spatial variabilities of four hydraulic parameters were examined: surface recharge, saturated hydraulic conductivity, saturated water content, and depth of unsaturated zone. Data form several shallow soils in the Chang- Hua area, central Taiwan, with detailed measurements of the hydraulic properties and the variations are illustrated. Results showed that solute penetration into groundwater through the unsaturated zone is significantly affected by the spatial variablilities of hydraulic parameters. However, not all of the spatial variabilities of hydraulic parameters which influence solute transport are equally significant. Our analyses also showed that the variability of depth of unsaturated soil appears to have the most significant influence on solute transport in shallow soil. The variabilities of the saturated hydraulic conductivity, of the surface recharge, and of the saturated water content have less influence in sequence. |
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