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Simulation of streamflow using hydrologic modeling system HEC-HMS

Erşahin, Berkan.
Basin models are fundamental for water resources assessment, analyzing quality and quantity of streamflow, managing water distribution systems, protecting and developing groundwater systems, flood protection, and water-supply forecasting. The integration of all hydrologic processes with their interconnections to each other at the basin scale is required for basin models. Mathematical basin models such as HEC-HMS are used for simulating hydrological processes in basin-scale to understand basin response to storm events. The goal of this study is to test the applicability of the HEC-HMS model for a basin located in Turkey and to demonstrate the importance of snowmelt especially for snow affected areas, such as Çakıt Basin which is the study area of this thesis. Requirements of event-based and continuous simulations are identified to guide future HEC-HMS applications in Turkey. Çakıt Basin, which is located in Niğde province has a drainage area of 518 km2. Meteorological data, flow data, digital elevation model, land use/land cover map and soil properties are collected and used in building event-based and continuous models. The models are calibrated and validated with observation stations constructed within the scope of 115Y041 TUBITAK project. The results of this study showed that streamflow at Çakıt Stream Gage Station, both for event-based and continuous runs, can be estimated realistically with NSE values higher than 0.6 for the validation periods using HEC-HMS. Furthermore, the importance of integration of the snowmelt into the hydrologic models is demonstrated.