Evaluation of the Use of Non-Conventional Waters on the Runoff and Sedimentation of the Tajen Basin Using the SWAT Model

Document Type : Research Paper

Authors

1 Water Engineering Department, Faculty of Agricultural Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Corresponding Author, Water Engineering Department, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

3 Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Abstract

Lack of water resources in Mazandaran province and the volume of effluent produced in different sectors, ‎has caused that in order to reduce the withdrawal of surface and groundwater resources in the province, the ‎use and management of unconventional water resources, much attention is paid. The purpose of the present ‎study is to evaluate the application of unconventional water use scenarios on the amount of runoff and ‎sediment in six stations (including Kordakhil, Garmroud, Varand, Vastan, Parvijabad and Aliabad stations) in ‎the Tejn watershed during the years 2000 to 2017 using the SWAT model. Recalibration and validation of the ‎model using data from 2003 to 2012 and 2013 to 2017 and then to evaluate the scenarios of allocating 30% of ‎the available wastewater for agriculture (scenario one), allocating 30% of unconventional water to feed ‎aquifers in the conditions of applying scenario one (scenario two) and a 20% reduction in the extraction of ‎underground water sources for irrigation and the use of unconventional water sources as alternative sources ‎to meet environmental needs (scenario three).‎‏ ‏Evaluating the efficiency of the model using R2 and NSE ‎coefficients shows the proper performance of the model in simulating these two parameters. The results ‎indicate that the application of scenario one did not affect the amount of runoff and sediment in the basin, but ‎with the application of scenario two, the amount of runoff and sediment decreased by 13.4% and 9.1%, ‎respectively. Applying Scenario three should be 10 to 20% of the annual discharge for the second six months ‎and 30 to 40% of the average annual discharge for the first six months of the year in order to meet the ‎environmental needs. The results obtained from the present research show that the use of non-conventional ‎water, in addition to solving the water shortage, also reduces the problems caused by the flow of runoff and ‎the settling of sediments.‎

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References

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Water and Irrigation Management
Volume 12, Issue 4
January 2023
Pages 713-728

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