Akademik Veri Yönetim Sistemi
IWA 4th Regional Conference on Diffuse Pollution and Eutrophication, İstanbul, Türkiye, 24 - 28 Ekim 2022, ss.332-339, (Tam Metin Bildiri)
Water quality model has an importance value to manage water resources. Soil and Water Assessment Tool (SWAT) is a hydrological and water quality model among several other software programs. SWAT is an effective ecosystem model and established tool for the studies on the water quality management. In this study, a hydrological and water quality model for the upper part of the Porsuk Basin were generated by using SWAT. In the model, the freely available instantaneous flowrate and nitrate (NO3) data from the GEMStat portal in addition to flowrate data obtained by local institution in Turkey named General Directorate of State Hydraulics Works (DSI). The Global Freshwater Quality Database GEMStat provides a large variety of water quality data from countries worldwide. The main target of this study is to investigate the utility of GEMStat data for a water quality model. For this purpose, firstly, the SWAT model was developed by using global data sources such as SRTM for digital elevation map, CORINE for digital land use/cover map, FAO-DSMW for digital soil map. Then, the flowrate results obtained by the model were calibrated and validated for both measured data obtained from DSI and GEMStat in three different periods. Finally, the goodness of the calibration and validation results was assessed using statistical measure, including the Nash-Sutcliffe efficiency (NSE). On a daily basis, the value of NSE was 0.64 for calibration step with measured flowrate data obtained from DSI. And, the value of NSE for validation with GEMStat instantaneous flowrate data with calibrated parameters is 0.58. The model was also calibrated using GEMStat NO3 data with a reasonable value (NSE = 0.45). Hence, the results show that GEMStat instantaneous flowrate and NO3 data can be used as an auxiliary open-source data in the SWAT modeling process.