A Second-order Budyko-type Parameterization of Landsurface Hydrology
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10422830.pdf
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5.08 MB
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Checksum (MD5)
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Author(s)
Andreou, Stefanos A.
Eagleson, Peter S.
Date Issued
June 1982
Publisher
Cambridge, Mass. : Ralph M. Parsons Laboratory, Hydrology and Water Resource Systems, Massachusetts Institute of Technology, Dept. of Civil Engineering
Series/Report no.
R (Massachusetts Institute of Technology. Department of Civil Engineering) ; 82-36.
Report (Ralph M. Parsons Laboratory for Water Resources and Hydrodynamics) ; 280.
Abstract
This work develops a simple, second-order parameterization of the water fluxes at a landsurface for use as the appropriate boundary condition in general circulation models of the global atmosphere. The derived parameterization incorporates the high non-linearities in the relationship between the near-surface soil moisture and the evaporation, runoff and percolation fluxes. Based on the one-dimensional statistical-dynamic derivation of the annual water balance developed by Eagleson (1978), it makes the transition to short term prediction of the moisture fluxes, through a Taylor expansion around the average annual soil moisture. A comparison of the suggested parameterization is made with other existing techniques and available measurements. A thermodynamic coupling is applied in order to obtain estimations of the surface ground temperature.
Description
Prepared under the Support of The National Aeronautics and Space Administration Grant NAG 5-134
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