عنوان مقاله [English]
The Correct management watersheds is one of the most important methods is the optimal use of soil and water resources. To do this, it’s need for comprehensive information of different methods administrative management. Recent decades, correct and timely assessment of quantitative and qualitative runoff is considered one of the concerns of the country's macro management. This project is modeling and evaluation and efficiency of the SWAT model to simulate the monthly runoff, sensitivity analysis, optimization of critical parameters, to evaluate the effect land use during the past four decades on Quantity of Maroon River watershed at the departure station (Idanak) in Kohgiloyeh and Boyerahmad. For this purpose, were used from semi-distributed SWAT model and SUFI2 program in the form of bundles SWAT CUP for sensitivity analysis, calibration, validation and uncertainty analysis.In this research first were prepared changes in land use map available as well as soil and vegetation in the watershed Maroon map within four ten-year period from 1980 to 2010 by using TM and ETM sensor of Landsat satellite .Observations Data of hydrometric Idenak station as base station was used during 1970 to 2010 in four ten-year period to observe changes in runoff during the calibration and validation. Compare the effect of land use management options on the different components of the hydrological cycle shows different amounts of runoff. Shows a the pessimistic scenario occurred in four decades. With continuing damage to the state in land use regression various amounts of runoff increases and decreases permeability and gullies on the surface and deep aquifers.