بهره برداري تلفيقي از منابع آب سطحي و زيرزميني حوضه گاماسياب براي حفظ تعادل آبخوان با استفاده از نرم افزار WEAP

چكيده انگليسي :

Integrative exploitation of Gamasiab surface and groundwater resoures basin to keep aquifers balance using WEAP software Afsaneh Sardani a sardani@ag iut ac ir June 2018 College of Agriculture Department of Water Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Jahangir Abedi Koupai koupai@cc iut ac ir Abstract Gamasyab Basin which is located in the western part of Iran is one of the main sub basins ofthe Karkheh basin The basin has an area of 11459 km2 The largest part of the Gamasiab basinarea is located in Kermanshah province and partly in Hamadan The basin has an area of 11459km2 Due to the fact that the level of aquifers has decreased and the Gamasiab River has beensubjected to seasonal drying in the recent years some actions are required to prevent theextinction of water resources and to deal with a water deficit or drought crisis In this research using WEAP software in Gamasiab basin water resources and catchment consumption weresimulated in order to assess the status of the basin and utilize and allocate optimal resources anduses of the basin It also tries to maintain surface water and underground water resourcesthrough exploitative policies In this research in addition to the reference scenario fourscenarios were used to optimize harvesting and consumption in the basin including sprinklerirrigation scenarios drip irrigation irrigation based on water requirement and water deficitirrigation scenarios including three scenarios 15 30 and 45 of water deficit irrigation Meanwhile according to the results of WEAP software the optimum result was obtained fromthe drip irrigation scenario which has the lowest non supply requirements average 0 5 millioncubic meters for all sub basins and the largest volume of aquifers 318 million cubic meters forthe Sahne sub basin 841 million cubic meters for the Harsin sub basin and 3003 million cubicmeters for the Kermanshah sub basin After that the optimum result was obtained from theirrigation scenario The average of 0 5 million cubic meters of unmet demands for all subbasins and the largest volume of aquifers 308 million cubic meters for the Sahne sub basin 803 million cubic meters for the Harsin sub basin and 2967 million cubic meters for theKermanshah sub basin Then 15 30 and 45 water deficit irrigation have the least unmetdemand and the largest increase in aquifer volume In the 15 water deficit irrigation scenario if we assume that the production function is linear and coefficient of yield reduction Ky isconstant for 85 water deficit irrigation rather than full irrigation there is a 15 8 reduction inproduct yield but this reduction is more tolerable than yield reduction in two scenarios of 30 water deficit irrigation and 45 water deficit irrigation which The yield reduction rate is 32 1 and 48 respectively In the 45 water deficit irrigation scenario the results are similar to thedrip irrigation scenario but with the assumption of the linearity of the production function itreduces the yield by 48 and decreases the farmers income so it can not be a good policy forthe basin In the surface irrigation scenario based on water demand the amount of waterrequired for irrigation is determined by the amount of water demand from CropWat software The results of this scenario are better than the current situation of the catchment It saves about70 million cubic meters of water per year for the Kermanshah sub basin 50 million cubicmeters per year for the Harsin sub basin and 10 million cubic meters per year for the sub basin However in this scenario the amount of water demand is in deficit but overall the deficit forthe whole year is less than the reference scenario Keywords WEAP CropWat Simulation Scenario Allocation 116

سرداني، افسانه

بهره برداري تلفيقي از منابع آب سطحي و زيرزميني حوضه گاماسياب براي حفظ تعادل آبخوان با استفاده از نرم افزار WEAP

WEAP , CropWat , شبيه سازي , سناريو , تخصيص