Estimating Basin Evapotranspiration Using Distributed Hydrologic Model
Publication: Journal of Hydrologic Engineering
Volume 8, Issue 2
Abstract
Proposed in this study is an approach to estimate regional evapotranspiration from potential evaporation using a distributed hydrologic model. If water is freely available in the storage tank of interest, evapotranspiration is taken as Penman’s potential evaporation. Otherwise, the reduction of actual evapotranspiration from potential evaporation is estimated using the simplified Philip’s soil-moisture relationship with the combination of a physically based distributed tank (PDTank) model. The average annual evapotranspiration in the study area is estimated to be 716 mm. Results are also compared with the actual evapotranspiration estimated by using Morton’s complementary relationship areal evapotranspiration (CRAE) model and Brusaert-Stricker’s advection-aridity (AA) model. These three models give quite similar performance of goodness. The AA model gives the largest estimation for the annual evapotranspiration, the physically based distributed tank (PDTank) model gives the smallest estimation, and the CRAE model shows the amount in-between the AA model and the PDTank result. But the PDTank gives better results than both the CRAE and the AA models for winter evapotranspiration.
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Published In
Journal of Hydrologic Engineering
Volume 8 • Issue 2 • March 2003
Pages: 74 - 80
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 25, 2002
Accepted: Nov 15, 2002
Published online: Feb 14, 2003
Published in print: Mar 2003
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