Simulation of Ahar Chay Water and Sediment Balance Using SWAT and ArcGIS Model

Atfi, Gholamreza and Raoof, Majid and Esmali, Abazar and Salahshoor, Ayat (2015) Simulation of Ahar Chay Water and Sediment Balance Using SWAT and ArcGIS Model. Masters thesis, University of Mohaghegh Ardabili.

Text (شبيه سازي بيلان آب و رسوب حوزه¬ آبخيز اهرچاي با استفاده از مدل SWAT و ArcGIS) Gholamreza Atfi.pdf Download (1MB)

Abstract

The importance of soil and water in human life and its role in the formation of communities and development of human civilization have known to everybody. Thus, soil and water resources stability and evaluation can be considered as essential activity in the watersheds studies. In addition, the study of water balance is absolutely important to investigate the hydrology cycle. Researching and preparation of water and sediment balance components in the watersheds require many spatial data and their analyzing, so new technologies, models and tools such as GIS are needed. In this study, the SWAT model, which is a conceptual and semi-distributed model in the water and sediment balance simulation, was used in Aharchay watershed located in Ahar, East Azarbayjan. SWAT efficiency in hydrologic simulation in this area has been evaluated. Metorology and hydometry data of 1979-2010 was selected for this simulation model. Aharchay watershed hydrology simulation in period of 32 years, showed that average amount of rainfall and evapotranspiration, as two main parameters of water balance in this study, were obtained 559.8 and 299.1 mm respectively. The SWAT Model calibrated with 1982 to 2002, and validated with 2003 to 2010 data. Calibration and validation processes done by using SWAT-CUP software and PSO algorithm. Nash-Sutcliffe efficiency coefficient (NS) for water and sediment simulation were abtained 0.39 and -0.06 for calibration stage and for validation stage -6.7 and -45 respectively. Results also shoed that water balance simulation has been done better than sediment balance simulation. Deficiency of required information, use of different data series in calibration and validation stages because of creation of Sattarkhan dam and existence of dam resovoir (with large area), some of reasons caused that model efficiency coefficients were low.

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