STEADY FLOW OF WATER THROUGH A 2-LAYER SOIL

被引:18
作者
SRINILTA, SA
NIELSEN, DR
KIRKHAM, D
机构
关键词
D O I
10.1029/WR005i005p01053
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A laboratory study of water moving steadily through an isothermal two‐layer soil is analyzed by using Darcy's equation for unsaturated flow. Factors considered were thicknesses and kinds of topsoil and subsoil, depth of surface water ponding, magnitude of outflow water pressure, and soil water history of the profile. Soil water pressure distributions were measured at 5‐cm depth intervals along the vertical columns. The unsaturated hydraulic conductivity was measured for sorption and desorption for each of four soils used as topsoil and subsoil in the two‐layer columns. Values of hydraulic conductivity as a function of soil water pressure were used to predict the measured soil water pressure distributions and steady state fluxes. The agreement between predicted and measured profiles is exceptionally close. The necessity of distinguishing between sorption and desorption, of obtaining a uniform soil bulk density distribution within each soil layer, and of ascertaining the hydraulic conductivity as a function of soil water pressure is discussed in relation to the predicted soil water pressure distribution and flux values. Copyright 1969 by the American Geophysical Union.
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页码:1053 / &
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