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Gökhan Cüceloğlu; Dursun Zafer Seker; Ayşegül Tanik; İzzet Öztürk. Analyzing Effects of Two Different Land Use Datasets on Hydrological Simulations by Using SWAT Model. International Journal of Environment and Geoinformatics 2021, 8, 172 -185.
AMA StyleGökhan Cüceloğlu, Dursun Zafer Seker, Ayşegül Tanik, İzzet Öztürk. Analyzing Effects of Two Different Land Use Datasets on Hydrological Simulations by Using SWAT Model. International Journal of Environment and Geoinformatics. 2021; 8 (2):172-185.
Chicago/Turabian StyleGökhan Cüceloğlu; Dursun Zafer Seker; Ayşegül Tanik; İzzet Öztürk. 2021. "Analyzing Effects of Two Different Land Use Datasets on Hydrological Simulations by Using SWAT Model." International Journal of Environment and Geoinformatics 8, no. 2: 172-185.
Precise representation of precipitation input is one of the predominant factors affecting the simulation of hydrological processes in catchments. Choosing the representative climate datasets is crucial to obtain accurate model results, especially in mountainous regions. Hence, this study assesses the suitability of the Climate Forecasting System Reanalysis (CFSR) and local climate data to simulate the streamflow at multiple gauges in the data-scarce mountainous Black Sea catchment. Moreover, the applicability of using the elevations band in the model is also tested. The Soil and Water Assessment Tool (SWAT) is used as a hydrological simulator. Calibration and uncertainty analysis are performed by using SWAT-CUP with the Sequential Uncertainty Fitting (SUFI-2) algorithm based on monthly streamflow data at six different hydrometric stations located at different altitudes. The results reveal that the CFSR dataset provides quite reasonable agreements between the simulated and the observed streamflow at the gauge stations compared to the local dataset. However, SWAT simulations with both datasets result in poor performance for the upstream catchments of the study area. Considering orographic precipitation by applying elevation bands to the local climate dataset using CFSR data leads also to significant improvements to the model’s performance. Model results obtained with both climate datasets result in similar objective metrics, and larger uncertainty with a coefficient variation (CV) ranging from 73% to 107%. This paper mainly highlights that (i) global climate datasets (i.e., CFSR) can be a good alternative especially for data-scarce regions, (ii) elevation band application can improve the model performance for the catchments with high elevation gradients, and iii) CFSR data can be used to determine precipitation lapse rate in data scarce-regions.
Gokhan Cuceloglu; Izzet Ozturk. Assessing the Impact of CFSR and Local Climate Datasets on Hydrological Modeling Performance in the Mountainous Black Sea Catchment. Water 2019, 11, 2277 .
AMA StyleGokhan Cuceloglu, Izzet Ozturk. Assessing the Impact of CFSR and Local Climate Datasets on Hydrological Modeling Performance in the Mountainous Black Sea Catchment. Water. 2019; 11 (11):2277.
Chicago/Turabian StyleGokhan Cuceloglu; Izzet Ozturk. 2019. "Assessing the Impact of CFSR and Local Climate Datasets on Hydrological Modeling Performance in the Mountainous Black Sea Catchment." Water 11, no. 11: 2277.
This research aimed to evaluate the impact of land cover/use changes on watershed responses and hydrological processes by applying the Soil and Water Assessment Tool (SWAT) distributed hydrologic model to the Buyukcekmece Water Basin of Istanbul Metropolitan city. SWAT model was run for two different scenarios for the 40-year period between 1973 and 2012, after completing calibration procedures under gauge-data scarce conditions. For the first scenario, 1990 dated Land cover/land use (LCLU) map and meteorological data obtained between 1973 and 2012 were used. For the second scenario, 2006 dated LCLU map and same meteorological data were used to analyze the impact of changing landscape characteristics on hydrological processes. In the selected watershed, LCLU changes started towards the end of the 1980s and reached a significant status in 2006; therefore, 1990 and 2006 dated LCLU maps are important to model human impact period in the watershed. Afterwards, LCLU changes within sub-basin level were investigated to quantify the effects of different types of land changes on the major hydrological components such as actual evapotranspiration, percolation, soil water, base flow, surface runoff and runoff. Our analysis indicated that, under the same climatic conditions, changes in land cover/use, specifically urbanization, played a considerable role in hydrological dynamics with changes on actual transpiration, base flow, surface runoff, runoff, percolation and soil water mainly due to urban and agricultural area changes. Among the different hydrological components analyzed at watershed level, percolation, ET and base flow were found to be highly sensitive to LCLU changes, whereas soil water was found as the least sensitive to same LCLU changes.
Elif Sertel; Mehmet Zeki Imamoglu; Gokhan Cuceloglu; Ali Erturk. Impacts of Land Cover/Use Changes on Hydrological Processes in a Rapidly Urbanizing Mid-latitude Water Supply Catchment. Water 2019, 11, 1075 .
AMA StyleElif Sertel, Mehmet Zeki Imamoglu, Gokhan Cuceloglu, Ali Erturk. Impacts of Land Cover/Use Changes on Hydrological Processes in a Rapidly Urbanizing Mid-latitude Water Supply Catchment. Water. 2019; 11 (5):1075.
Chicago/Turabian StyleElif Sertel; Mehmet Zeki Imamoglu; Gokhan Cuceloglu; Ali Erturk. 2019. "Impacts of Land Cover/Use Changes on Hydrological Processes in a Rapidly Urbanizing Mid-latitude Water Supply Catchment." Water 11, no. 5: 1075.
The use of water resources has increased with rapid population growth, industrial development, and agricultural activities. Besides, the problem might increase with the potential climate change impacts on water quantity. Thus, sustainable use of water resources becomes crucial. Modeling studies provide scientific support to the analysis of water resource problems and develop strategies for current and potential problems for the sustainable management of water resources. In this study, WEAP-PGM (Water Evaluation and Planning System—Plant Growth Model) was applied to the Sakarya River Basin in Turkey, where almost 50% of the area is agricultural land. The main goals in the study are compiling/integrating available data from different sources in a data-scarce region for hydrological models, and estimating the water budget components of Sakarya River Basin on an annual basis as well as investigating the applicability of WEAP-PGM. General model performance ratings indicated that model simulations represent streamflow variations at acceptable levels. Model results revealed that, runoff is 4747 million m3, flow to groundwater is 3065 million m3 and evapotranspiration is 23,011 million m3. This model setup can be used as a baseline for calculating the crop yields under climate change in the context of water-food-energy nexus in the further studies.
Salim Yaykiran; Gokhan Cuceloglu; Alpaslan Ekdal. Estimation of Water Budget Components of the Sakarya River Basin by Using the WEAP-PGM Model. Water 2019, 11, 271 .
AMA StyleSalim Yaykiran, Gokhan Cuceloglu, Alpaslan Ekdal. Estimation of Water Budget Components of the Sakarya River Basin by Using the WEAP-PGM Model. Water. 2019; 11 (2):271.
Chicago/Turabian StyleSalim Yaykiran; Gokhan Cuceloglu; Alpaslan Ekdal. 2019. "Estimation of Water Budget Components of the Sakarya River Basin by Using the WEAP-PGM Model." Water 11, no. 2: 271.
Uncertainties due to climate change and population growth have created a critical situation for many megacities. Investigating spatio-temporal variability of water resources is, therefore, a critical initial step for water-resource management. This paper is a first study on the evaluation of water-budget components of water resources in Istanbul using a high-resolution hydrological model. In this work, the water resources of Istanbul and surrounding watersheds were modeled using the Soil and Water Assessment Tool (SWAT), which is a continuous-time, semi-distributed, process-based model. The SWAT-CUP program was used for calibration/validation of the model with uncertainty analysis using the SUFI-2 algorithm over the period 1977–2013 at 25 gauge stations. The results reveal that the annual blue-water potential of Istanbul is 3.5 billion m3, whereas the green-water flow and storage are 2.9 billion m3 and 0.7 billion m3, respectively. Watersheds located on the Asian side of the Istanbul megacity yield more blue-water resources compared to the European side, and constitute 75% of the total potential water resources. The model highlights the water potential of the city under current circumstances and gives an insight into its spatial distribution over the region. This study provides a strong basis for forthcoming studies concerning better water-resources management practices, climate change and water-quality studies, as well as other socio-economic scenario analyses in the region.
Gokhan Cuceloglu; Karim C. Abbaspour; Izzet Ozturk. Assessing the Water-Resources Potential of Istanbul by Using a Soil and Water Assessment Tool (SWAT) Hydrological Model. Water 2017, 9, 814 .
AMA StyleGokhan Cuceloglu, Karim C. Abbaspour, Izzet Ozturk. Assessing the Water-Resources Potential of Istanbul by Using a Soil and Water Assessment Tool (SWAT) Hydrological Model. Water. 2017; 9 (10):814.
Chicago/Turabian StyleGokhan Cuceloglu; Karim C. Abbaspour; Izzet Ozturk. 2017. "Assessing the Water-Resources Potential of Istanbul by Using a Soil and Water Assessment Tool (SWAT) Hydrological Model." Water 9, no. 10: 814.
The Dalyan Region that drains into a complex lagoon system is located on the Mediterranean Sea coast of southwest Turkey. There are no large streams in the area, indicating that a considerable amount of freshwater draining into the lagoon is expected to be based on groundwater inflows and that groundwater quality is an important issue for the lagoon ecosystem. Since the lagoon and its watershed are within an environmental special protection area, planning preventive and mitigative measures toward water quantity and quality, including groundwater, is crucial. Since an important step in such a study is the generation of vulnerability map of groundwater pollution, this study aims at the generation of an intrinsic groundwater vulnerability map and its assessment for the first time in the study area based on the DRASTIC method. Since the DRASTIC method requires recharge rates for the calculation of groundwater pollution potential index, these were obtained from a previous modeling study conducted in the same area, where SWAT model was used. The intrinsic vulnerability maps generated were overlaid with current land-use maps to evaluate actual groundwater pollution risk. Our analyses showed that 46% of the study area is under the high risk of groundwater pollution, where 62% of the vulnerable high-risk area is agricultural land.
Ali Ertürk; Alpaslan Ekdal; Melike Gurel; Nusret Karakaya; Gokhan Cuceloglu; Ethem Gönenç. Model-based assessment of groundwater vulnerability for the Dalyan Region of southwestern Mediterranean Turkey. Regional Environmental Change 2017, 17, 1193 -1203.
AMA StyleAli Ertürk, Alpaslan Ekdal, Melike Gurel, Nusret Karakaya, Gokhan Cuceloglu, Ethem Gönenç. Model-based assessment of groundwater vulnerability for the Dalyan Region of southwestern Mediterranean Turkey. Regional Environmental Change. 2017; 17 (4):1193-1203.
Chicago/Turabian StyleAli Ertürk; Alpaslan Ekdal; Melike Gurel; Nusret Karakaya; Gokhan Cuceloglu; Ethem Gönenç. 2017. "Model-based assessment of groundwater vulnerability for the Dalyan Region of southwestern Mediterranean Turkey." Regional Environmental Change 17, no. 4: 1193-1203.