Document Type : Research Paper
Authors
1 Department of Forest, Range and Watershed Management, Faculty Natural Resources and Environmental, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Forest, Range and Watershed Management, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University,Tehran, Iran
3 Soil Conservation and Watershed Management Research Institute Education and Extension Organization (AREEO), Tehran, Iran
4 Department of Reclamation of Arid and Mountainous Regions, University, Tehran, Karaj, Iran
5 Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran
Abstract
This study focuses on simulation and management the various hydrological responses to climatic changes. The semi-distributed hydrologic model SWAT (soil and water assessment tool) was used to evaluate runoff and water balance due to climate changes in Siminehroud and Zarrinehroud watersheds. The simulation period was selected between 1990 and 2014. The assessment results in the calibration and validation periods using the NS and R2 obtained 0.75, on average. Using statistical multisite downscaling of LARS-WG climatic models MIROC-ESM-CHEM، GFDL-ESM2M and NorESM1-M the future climatic condition entered to the model using two optimistic RCP2.6 and pessimistic RCP8.5 scenarios. The largest changes in runoff in the upcoming period, May, reduced by 2.4 m3 s-1 and in April, increased by 1.49 m3 s-1 in the optimistic scenario. In RCP8.5 pessimistic scenario in May and June, also the highest runoff was observed. The rate of actual monthly evaporation will increase in the optimistic scenario up to 3 mm and in the pessimistic scenario up to 8 mm increase will have a negative impact on the available water resources in the watershed. With estimation the climate changes and its effect on the stream flow discharge is possible performing a suitable management in Siminehroud and Zarrinehroud watersheds.
Keywords
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