| TRANSIENT FLOW DRAINAGE EQUATIONS CONSIDERING BOTH DELAYED GRAVITY RESPONSE AND EVAPORATION FROM WATER TABLE |
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| 引用本文： | Zhang Wei-zhenWuhan University of Hydraulic and Electrical Engineering,Wuhan 430072,P. R. China. TRANSIENT FLOW DRAINAGE EQUATIONS CONSIDERING BOTH DELAYED GRAVITY RESPONSE AND EVAPORATION FROM WATER TABLE[J]. 水动力学研究与进展(B辑), 1997, 0(2) |
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| 作者姓名： | Zhang Wei-zhenWuhan University of Hydraulic and Electrical Engineering Wuhan 430072 P. R. China |
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| 作者单位： | Zhang Wei-zhenWuhan University of Hydraulic and Electrical Engineering，Wuhan 430072，P. R. China |
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| 基金项目： | the Science Fundation of the National Education Commission |
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| 摘 要： | The drainable porosity is one of the important parameters in the unsteady drainage formulas. Due to delayed gravity response the drainable porosity is a function of the rate of drawdown and the depth of water table. The evaporation from groundwater plays an important role in lowering water table, in drainage design formulas it should be taken into account. Drainage equations considering evaporation from groundwater varying with water table depth and evaporation from water surface and involving constant drain-able porosity have been proposed by many authors. In this paper new formulas considering both delayed gravity yield and evaporation as a function of water table depth are developed and verified by experimental data.
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TRANSIENT FLOW DRAINAGE EQUATIONS CONSIDERING BOTH DELAYED GRAVITY RESPONSE AND EVAPORATION FROM WATER TABLE |
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| Zhang Wei-zhenWuhan University of Hydraulic and Electrical Engineering,Wuhan ,P. R. China. TRANSIENT FLOW DRAINAGE EQUATIONS CONSIDERING BOTH DELAYED GRAVITY RESPONSE AND EVAPORATION FROM WATER TABLE[J]. Journal of Hydrodynamics, 1997, 0(2) |
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| Authors: | Zhang Wei-zhenWuhan University of Hydraulic Electrical Engineering Wuhan P. R. China |
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| Affiliation: | Zhang Wei-zhenWuhan University of Hydraulic and Electrical Engineering,Wuhan 430072,P. R. China |
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| Abstract: | The drainable porosity is one of the important parameters in the unsteady drainage formulas. Due to delayed gravity response the drainable porosity is a function of the rate of drawdown and the depth of water table. The evaporation from groundwater plays an important role in lowering water table, in drainage design formulas it should be taken into account. Drainage equations considering evaporation from groundwater varying with water table depth and evaporation from water surface and involving constant drain-able porosity have been proposed by many authors. In this paper new formulas considering both delayed gravity yield and evaporation as a function of water table depth are developed and verified by experimental data. |
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| Keywords: | transient drainage equations delayed gravity response variable drain-able porosity evaporation from water table |
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