The Determination of Çarşamba River Water Budget with Swat in Konya Closed Basin, Turkey

Abstract

Hydrological models are frequently used in the development of strategies for water resources management. The Soil and Water Assessment Tool (SWAT), which is a physically based and semi-dispersed model, provides very successful results in the examination of hydrological events, development of sediment and water quality models. The creation of the water budget in water potential determination studies provides important comments about the study area. The Çarşamba River, located in the Konya Closed Basin, was designated as the study area. The establishment of the hydrological model of the Çarşamba Çayı, which contributes to meet the agricultural irrigation needs, is necessary to determine the water potential of the study area. In this study, the water budget was evaluated for the headwater of Çarşamba River during the period of 2006-2015. The hydrological model of the study area was constructed by using the SWAT model. At the stage of development of the hydrological model, hydrological and meteorological data were obtained from Seydişehir and Hadim meteorological observation stations and D16A115 flow observation station. The evapotranspiration required for water budget calculations was determined using the Penman Monteith method. In the evaluation of the success of the SWAT model, the coefficient of determination (R2 ), Nash-Sutcliffe Efficiency Coefficient (NSE) and percentage of bias (PBIAS) performance criteria were used. SWAT-CUP was used for the calibration and validation of the SWAT model. According to the results of the study, a negative change was observed in storage at the end of 2008 and 2013. However, there have been positive changes in storage of the study area in other years. In annual total precipitation, the highest value was obtained in 2009 and the lowest value was obtained in 2013. When the evapotranspiration parameter was examined, the highest values were observed in the years 2011 and 2012.