ASSESSMENT OF THE WATER BUDGET BY USING A CONCEPTUAL MODEL: THE CASE OF ÇARŞAMBA BASIN

Abstract: Hydrologic models are crucial to detect, understand and improve water resources and their behaviour. The Hydrologiska Byråns Vattenbalansavdelning (HBV) model which is deterministic, lumped, daily rainfall-runoff model, was implemented to the headwater of Çarşamba Basin, located on Konya Closed Basin in Turkey. The basin is in a region data-scarcity hence we used the data of Seydisehir and Hadim meteorological stations nearby. We aimed to understand the hydrological processes and obtain information that will facilitate the identification of water management strategies. Initially, the model was calibrated using the Generalized Reduced Gradient (GRG) nonlinear solving method for optimization, and at this stage, the HBV model showed an adequate performance. For daily runoff, the HBV model has performed at Kling-Gupta efficiency coefficient (KGE)=0.676 and Nash-Sutcliffe efficiency coefficient (NSE)=0.501. In this study, we also calculated the water budget as annual and seasonal to appraisal temporal performance of the model. Consequently, the best results have been achieved for spring months while achieving worst for summer months.