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頁籤選單縮合
題 名 | 遲滯土壤水分傳輸數值模式之研究=A Study of Water Transport Model with Hysteresis |
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作 者 | 王銘燦; 陳主惠; 譚義績; | 書刊名 | 農業工程學報 |
卷 期 | 49:1 2003.03[民92.03] |
頁 次 | 頁1-8 |
分類號 | 434.222 |
關鍵詞 | 遲滯現象; 理查方程式; 有限差分法; 土壤保水曲線; Hysteresis; Richards equation; Finite difference method; |
語 文 | 中文(Chinese) |
中文摘要 | 於未飽和層土壤中隨著乾燥與潮濕的歷程而有遲滯現象的發生,許多土壤水分傳輸之研究因為遲滯現象的複雜性而將之忽略。而描述遲滯土壤水分傳輸現象之控制方程式為理查方程式,在考慮遲滯現象的狀況下,解析解無法求得,所以使用數值解解之。此模式結合了van Genuchten的參數模式及Scott (1983)遲滯模式觀念,為了達到質量平衡,本研究採用混合型理查方程式探討遲滯土壤並用有限差分法來做數值離散,並與實驗結果作比較。 |
英文摘要 | Hysteresis occurs during wetting and drying process in unsaturated soils. Most studies are ignored about hysteresis because of its complication. Because of governing equation of unsaturated flow is nonlinear equation, and its analytic solution can't be obtained easily. Therefore, the numerical scheme is developed for this mothod. The model is based on a combination of van Genuchten's parametric models and Scott's hysteretic model. For the purpose of mass balance, finite difference method is used to solve the mix form of Richards equation in the study, and it compared with the experiment data. |
本系統中英文摘要資訊取自各篇刊載內容。