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題 名 | 二維不飽和入滲問題於連續變化降雨強度及任意起始條件以及具地下水位條件下之解析解=Analytical Solution of Two Dimensional Unsaturated Infiltration Problems with Unsteady Continuous Changing Rainfall Intensity and with Water Table |
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作 者 | 陳建謀; 譚義績; 陳主惠; | 書刊名 | 農業工程學報 |
卷 期 | 46:3 2000.09[民89.09] |
頁 次 | 頁49-58 |
分類號 | 443.67 |
關鍵詞 | 土壤體積含水比; 張力水頭; 蒸發散; Volumetric water content; Pressure head; Evaporation; |
語 文 | 中文(Chinese) |
中文摘要 | 本文目的在於求解二維不飽和入滲問題於有地下水位時考慮降雨強度隨時間及空間變化與任意起始體積含水比下之解析解。基於假設κ=κ□e□及θ=θ□+(θ□-θ□)e□來表示水力傳導係數及體積含水比與張力水頭間之指數分佈關係,並透過函數轉換技巧可求出任意連續變化降雨強度下及任意起始條件下,積水前土壤體積含水比剖面之解析解,同時可預測達積水所需之時間。本解析解可應用於降雨入滲及蒸發散之邊界條件下,以壤土為例,可模擬降雨強度或蒸發散速度隨時間及空間變化與實際降雨或蒸發散特性較接近,此外所推導之結果為級數解之型式具容易運算之優點且可提供考慮連續變化降雨強度或蒸發散速度之複雜數值模式驗證之用。 |
英文摘要 | This purpose of this paper is to solve two-dimensional Richards's equation under the conditions of time dependent and non-uniform distribution of rainfall intensity and arbitrary initial volumetric water content. Exponential functional forms κ=κ□e□ and θ=θ□+(θ□-θ□)e□ are used to represent the hydraulic conductivity and volumetric water content with pressure relations. The analytical solution of this paper can predict ponding time and obtain the solution of volumetric water content distribution before and ponding. Also, analytical solution can be applied to the case of evaporation and infiltration. For example of loam soil, it can simulate variation of rainfall intensity, which varied with time and space. The analytical solutions of this paper reflected real situation exactly, and can be applied to verify some complicated numerical models, which consider continuous changing rainfall intensity with time and space. |
本系統中英文摘要資訊取自各篇刊載內容。