In this contribution an analytical framework is put forth for the water budget of the unsaturated zone. The most important assumptions made are (1) an instantaneous redistribution of moisture and (2) a linear relationship between evapotranspiration and relative soil saturation. For storm periods, infiltration is described using the well-known solution of Philip [1957] in conjunction with the time compression approximation. For interstorm periods a new solution is derived for the moisture depletion of a soil water reservoir that experiences simultaneous evapotranspiration and percolation. The framework compares favorably with numerical solutions of Richards' equation for a wide variety of climate conditions and soil hydraulic properties. Its simplicity and computational efficiency make the framework well suited for the analysis of the impact of spatial soil and rainfall heterogeneity; on the water budget of the unsaturated zone.
机构:
AGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDSAGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDS
Kim, CP
Stricker, JNM
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AGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDSAGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDS
Stricker, JNM
Feddes, RA
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AGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDSAGR UNIV WAGENINGEN,DEPT WATER RESOURCES,NL-6709 PA WAGENINGEN,NETHERLANDS
机构:
Department of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, Netherlands
Boston Consulting Group BV, J. F. Kennedylaan 100, Baarn,3741 EH, NetherlandsDepartment of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, Netherlands
Kim, C.P.
Stricker, J.N.M.
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Department of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, NetherlandsDepartment of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, Netherlands
Stricker, J.N.M.
Feddes, R.A.
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机构:
Department of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, NetherlandsDepartment of Water Resources, Wageningen Agricultural University, Nieuwe Kanaal 11, Wageningen,6709 PA, Netherlands
Feddes, R.A.
Water Resources Research,
1997,
33
(05):
: 991
-
999