Identifying Two-Dimensional Characteristics of Surface Water Hydraulics in an Irrigated Paddy Field
Publication: Journal of Irrigation and Drainage Engineering
Volume 135, Issue 4
Abstract
To efficiently manage the water supply for paddy rice and to reduce the inundation damage from floods, it is necessary to enhance our understanding of the characteristics of the surface water hydraulics in an irrigated paddy field. In this study, a two-dimensional numerical model is used, and the model’s applicability for simulating surface irrigation and drainage is evaluated. The model’s Manning roughness coefficient is estimated, taking into account the growth stage of the paddy rice; the simulation results are in good agreement with the observations. Model simulations reveal that the initial ponding depth affects the wave propagation and the increase in water depth during irrigation. There are few differences in piezometric heads among the positions except for those close to the outlets during drainage. Constructing drainage ditches in a paddy field reduces the drainage time to 24 h. Also, the study results reveal that it is preferable to determine the appropriate water management measures by considering the characteristics of the surface water hydraulics of paddy fields to reduce costs and labor input.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 135 • Issue 4 • August 2009
Pages: 431 - 442
Copyright
© 2009 ASCE.
History
Received: Mar 23, 2008
Accepted: Oct 23, 2008
Published online: Jan 27, 2009
Published in print: Aug 2009
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