Water is a substance that all the creatures of the earth depend on for their survival, considering the limited water resources on the surface of the earth and also the expansion of the population, the lack of resources and the deterioration of the environment in the world, the efficient management and exploitation of the region Water resources are very important. Runoff, as one of the most basic water sources in the world, has been affected not only by human activities but also by climate changes. One of the challenges of hydrologists and water resource policy makers is the increasing decrease of water resources. Therefore, the separation of human activities and climate change is very important in reducing the annual flow of Zayandeh-Rood, considering the strategic location of the Zayandeh-Rood River as a strategic and important water source in the central part of Iran, which requires management planning. In this research, in order to separate the contribution of human and climatic activities on the reduction of the inflow to the Zayandeh-Rood dam, it has been eva‎luated using a conceptual method based on the Boudico framework. Flow, precipitation and potential evapotranspiration data that have a reasonable uncertainty at the 95% confidence level for the three sub-catchments. The flow downstream the watersheds of Plasjan, Shahrukh Castle and Zayandeh-Roud decreased by 21.3 mm, equivalent to 23.53%, by 181.97 mm, equivalent to 31.14%, and by 31.51 mm, equivalent to 14. Fu model has been determined as the best physical basis model for simulating the flow of the three sub-basins of Plasjan, Shahrokh Castle and Zayandeh-Roud. In the Plasjan catchment area, 83% of the flow decrease is related to climate change and 17% of the flow decrease is related to human activities. In the Shahrokh Castle catchment area, 82% of the flow reduction is related to human activities and 18% of the flow reduction is related to climate change. Then, in the Zaindeh-Roud watershed, 75% of the flow reduction is related to human activities and 25% of the flow reduction. It is related to climate change. In general, the effects of human activities are the main factor in reducing the flow in the two sub-basins of Qala Shahrukh and Zayandeh-Roud, and climate change has a dominant role in reducing the flow in the Plasjan sub-basin

عليرضا گوهري , سعيد اسلاميان

علي ترابي حقيقي

جهانگير عابدي كوپائي , رضا مدرس