Document Type : Research Paper
Department of Water Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
Department of Water Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Guilan.
Department of Water Engineering, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.
In this study, a fuzzy multi-objective planning model was used for the optimal allocation of irrigation water and land use under multiple uncertainties. The effect of effective rainfall for determining the irrigation requirement of cultivated crops and also the limitation of surface water and groundwater resources were taken into account in the developed model in the Talash study area, which is located outside the Sefidroud irrigation and drainage network. The study area of Talesh was divided into three irrigation areas: Astara, Talesh, and Rezvanshahr. Then, the results of the optimal model were investigated at different levels of α-cut (0, 0.2, 0.4, 0.6, 0.8, and 1). Allocated amounts of surface water and groundwater showed that maximum shortages occurred in June and July in Talash area, So that the shortage of Talash area in the upper and lower bounds of a-cut=0.8, which was 1.7 and 2.7 times more than Astara area as well as 1.2 and 1.8 times more than Rizvanshahr area, respectively. The optimal ratio of groundwater consumption to the total allocated water in Astara, Talesh, and Rezvanshahr areas was obtained as 13.4%, 58.1%, and 28.5% respectively. Also, 100% of the allowable groundwater is consumed in most of the dry months of the year. Due to the unavailability of many farmers in this area to surface water resources, useful approaches should be given for more access to surface water for farmers. Therefore, the results of this study could be a warning for the regional manager planners to consider this issue in future planning to select the best decision regarding the use of the type of irrigation water resource.