Model for the Simulation of Water Flows in Irrigation Districts. I: Description
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Volume 132, Issue 4
Abstract
Significant improvements in the profitability and sustainability of irrigated areas can be obtained by the application of new technologies. In this work, a model for the simulation of water flows in irrigation districts is presented. The model is based on the combination of a number of modules specialized on surface irrigation, open channel distribution networks, crop growth modeling, irrigation decision making, and hydrosaline balances. These modules are executed in parallel, and are connected by a series of variables. The surface irrigation module is based on a numerical hydrodynamic routine solving the Saint Venant equations, including the heterogeneity of soil physical properties. The simulation of water conveyance is performed on the basis of the capacity of the elements of the conveyance network. Crop growth is simulated using a scheme derived from the well-known model CropWat. The irrigation decision making module satisfies water orders considering water stress, yield sensitivity to stress, multiple water sources, and the network capacity. Finally, the hydrosaline module is based on a steady state approach, and provides estimations of the volume and salinity of the irrigation return flows for the whole irrigation season. The application of the model to district irrigation management and modernization studies may be limited by the volume of data required. In a companion paper, the model is calibrated, validated, and applied to a real irrigation district.
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Acknowledgments
This research was funded by the Plan Nacional de of the Government of Spain, by the FEDER funds of the European Union through Grant 2FD97-0547-C02, and by the of the Autonomous Government of Aragón (awarding a research scholarship to S. Lecina). Thanks are due to the management, technical services, ditch riders, and farmers of the Irrigation District V of Bardenas for their unconditional support.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 132 • Issue 4 • August 2006
Pages: 310 - 321
Copyright
© 2006 ASCE.
History
Received: Jul 26, 2004
Accepted: Aug 1, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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