Modified Model for Simulating Hydrologic Processes for Plastic Mulch Production Systems
Publication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 9
Abstract
A lumped hydrologic model (ACRU2K.1), developed from ACRU2000, was extended and evaluated to simulate water dynamics in a plastic mulch bedded system for vegetable production under high water table environments. The updated model (ACRU2K.2) and ACRU2K.1 were calibrated using data collected during the fall 2005 and spring 2006 crop seasons of a field study for a vegetable production system in south Florida. Both model versions were evaluated using data from the fall 2006 crop season. Graphical and statistical methods were applied to evaluate and compare the performance of ACRU2K.1 and ACRU2K.2 using observed and simulated water table depths (WTD). Graphical analyses showed no added advantage in using ACRU2K.2 with its new irrigation process. However, the introduction of a drainage process for ACRU2K.2 showed some improvement over ACRU2K.1 in simulating changes in the water table. For the calibration period, Nash-Sutcliffe coefficient (NS) values for ACRU2K.1 and ACRU2K.2 were 0.73 and 0.65, respectively. However, for the evaluation period NS values for ACRU2K.1 and ACRU2K.2 were and , respectively. In general, ACRU2K.1 and ACRU2K.2 underperformed when simulating the WTD for plastic mulch bedded systems under high water table environments. This was the result of ACRU2000’s inability to respond correctly to sharp water table fluctuations (within 12 h) and is a fundamental limitation in its hydrological response time.
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Acknowledgments
Funds for this study were provided by the Southwest Florida Water Management District and the Florida Department of Agriculture and Consumer Services. The authors are very grateful to J. Dale Hardin and James M. Knowles for their technical assistance.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 9 • September 2013
Pages: 738 - 746
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 21, 2012
Accepted: Mar 20, 2013
Published online: Mar 22, 2013
Published ahead of production: Apr 1, 2013
Discussion open until: Aug 22, 2013
Published in print: Sep 1, 2013
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