3,- 1Dept. of Environmental Engineering, Suleyman Demirel University, Isparta, Türkiye (meltemkacikoc@sdu.edu.tr)
- 2Non-affiliated Senior Engineer, Antalya, Türkiye (buketmesta@gmail.com)
- 3Dept. of Civil Engineering, Hydraulic Division, Dokuz Eylul University, İzmir, Türkiye (okan.fistikoglu@deu.edu.tr)
- 4Computer Research Centre, Anadolu University, Eskisehir, Türkiye (huseyinozkaya@anadolu.edu.tr)
- 5Engineer, Ministry of Agriculture and Forestry, Directorate General for Water Management, Ankara, Türkiye (kubra.ozdemircalli@tarimorman).gov.tr)
Abstract
Reliable hydrological modelling tools that can operate with the type and quality of data commonly available at the basin scale are essential for effective water resources planning. In recent years, the HIDROTURK model has been developed to support national hydrological assessments in Türkiye, especially in modelling tasks undertaken as part of river basin management planning processes. This study presents one of the first comprehensive evaluations of the newly updated HIDROTURK Phase II model and compares its performance with the AQUATOOL + EVALHID hydrological modelling system. The North Marmara River Basin was selected as the test region due to its complex hydrological structure and diverse sub-basin characteristics.
Hydrological simulations were carried out using long-term meteorological inputs derived from precipitation and evapotranspiration records for the period 1989–2014, enabling the examination of the models under a wide range of climatic conditions. Streamflow outputs were compared with observations at 14 calibration points, and model performance was assessed using the Nash–Sutcliffe Efficiency (NSE) and Percent Bias (PBIAS) indicators.
The results indicate that the meteorological inputs generated through HIDROTURK’s internal processing tools show a high level of agreement with data prepared using more traditional methods, and that both models produced comparable flow patterns under similar conditions. Overall, the findings demonstrate that HIDROTURK Phase II exhibits stable behavior even at this early stage of development and provides a practical and reliable alternative for hydrological simulations.
Keywords: Hydrological Modelling; Basin-Scale Simulation; Model Comparison; Model Performance Evaluation; Streamflow Calibration
ACKNOWLEDGEMENT: The authors would like to express their gratitude to the projects “Technical Assistance on Preparation of River Basin Management Plans for Six Basins (EuropeAid/140294/IH/SER/TR)” and “Development and Sustainability of the HIDROTURK Model Project” for their support. The authors also thank the Directorate General for Water Management, the State Hydraulic Works, and the General Directorate of Meteorology for providing essential data.
How to cite: Kacikoc, M., Mesta, B., Fistikoglu, O., Ozkaya, H., and Ozdemir-Calli, K.: Comparative Evaluation of the Newly Developed HIDROTURK-Phase II Hydrological Model in the North Marmara River Basin, Türkiye, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-1436, https://doi.org/10.5194/egusphere-egu26-1436, 2026.
