Climatic Changes and the application of an Urban WEF Nexus Approach to the Utilization of the Existing Recources in Boroujerd

Since such hydrological factors as precipitation and temperature, affected by climate change, are influential in simulating WEF processes, it is necessary to explore the problem. Currently the most reliable instrument for generating the climatic scenarios of the paired 3D models for the general flow of atmosphere and ocean. This study aims to use the existing water resources for urban sustainable development with a view to climate change. Based on two different scenarios of RCP2.6 and RCP8.5 for the 5th Evaluation Report by on Intergovernmental committee on climate changes, the output of HADGEM2 model was used and the city of Boroujerd, Iran, was chosen as the pilot location where the WEF Nexus approach has been adopted. The findings indicate that there will be a 1.5-3C˚ increase in temperature in the next period. Furthermore, in RCP2.6 scenario, it will experience as much as 20mm increase in precipitation and in RCP8.5 it will decrease by 40mm. The results from WEF model suggest that a centralized agricultural system accounts for 21.29% of the local demand for fruits and 272% of the local demand for vegetables while rainwater harvesting is responsible for 3.6% of the demand for fresh water resources. The water demand for urban irrigation purposes is supplied with urban sewage cycle and reconsumption. Biogas production and power generation from urban waste can daily supply 1.08% of the current electricity. This means that the cost of sewage management might be lower than that of renovation and new operation in urban sewage.