Assessment of the Basin Hydrological Responses to Development of Pressurized Irrigation Systems (Case study: The Ahar-chai basin)

Document Type : Original Article

Authors

1 Phd student., Department of Water Engineering., University of Urmia., Urmia.,Iran

2 Assistant professor., Department of Water Engineering, Urmia Lake Research Institute, University of Urmia., Urmia., Iran.

3 Associate professor., Department of Water Engineering, Faculty of Agriculture, University of Urmia., Urmia., Iran.

4 Assistant professor., Department of Water Engineering., Urmia Lake Research Institute, University of Urmia., Urmia., Iran

Abstract

This study analyzes the hydrological impacts of irrigation systems changes in the Ahar-chai basin. For this purpose, a conceptual approach based on water accounting was applied using WEAP model. Hydrological process of the basin in the form of two models of soil moisture method simulated. In the next step, the calibration and validation of models made and the components of the basin hydrologic balance estimated. The results showed that total evapotranspiration was higher in pressurized irrigation than in surface irrigation (26%). Surface runoff during pressurized irrigation period was lower than surface irrigation period (52%), due to reducing irrigation return flow and rainfall. These results show that the surface runoff can be influenced by the type of irrigation and rainfall. In general, the water balance greatly reduced in the basin. The results indicated the negative potential of pressurized irrigation on basin hydrology. Results also showed that WEAP model is able to assess the hydrological impacts of different irrigation systems on basin water resources. To basin water resources management, the water balance accounting methodology should be implemented to avoid misunderstandings about the hydrological impacts of pressurized irrigation, such as unrealistic expectations in water saving in the basin.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 11, Issue 4 - Serial Number 64
November and December 2017
Pages 626-635

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