Distributed Hydrologic Modeling in a Partially Urbanized Agricultural Watershed Using Water and Energy Transfer Process Model
Publication: Journal of Hydrologic Engineering
Volume 10, Issue 4
Abstract
The water and energy transfer process (WEP) model, which has been successfully applied to urbanized watersheds, is improved for hydrologic modeling in an agricultural watershed by developing a paddy model. The new model is used to simulate the Yata watershed at grid size and variable time step. A simulation is performed for model calibration and verification. Model results are compared to measured values of river discharges, groundwater levels, and soil moisture contents. Sensitivity of annual water budgets and hourly river discharges to rainfall estimation error is also analyzed. The verified model is applied to simulate the long-term variation of water budgets and flood-retarding effects of paddy fields in the watershed. Study results indicate that: (1) the WEP model is applicable to agricultural watersheds in addition to urbanized ones; (2) annual weather variations give more obvious impact on water budgets than urbanization in the agricultural watershed; and (3) paddy fields play important roles both in reducing flood peaks and in conserving low river flow in the watershed.
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Acknowledgments
Sincere thanks are extended to Professor Yoshihisa Kawahara at Kagawa University Japan, Dr. Guangheng Ni, of Nippon Koei Co. Ltd., Japan, and Mr. Koei Tojima at Docon Co. Ltd., Japan, for their previous cooperation in the key research project of PWRI. Japan Science and Technology (JST) Corporation is acknowledged for its financial support to the first writer from 1999 to 2001.
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Information & Authors
Information
Published In
Journal of Hydrologic Engineering
Volume 10 • Issue 4 • July 2005
Pages: 253 - 263
Copyright
© 2005 ASCE.
History
Received: May 27, 2003
Accepted: Aug 30, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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