Search Results - "Okkan, Umut"

Evaluation of the suitability of NCEP/NCAR, ERA-Interim and, ERA5 reanalysis data sets for statistical downscaling in the Eastern Black Sea Basin, Turkey by Nacar, Sinan, Kankal, Murat, Okkan, Umut

“…Climate community frequently uses gridded reanalysis data sets in their climate change impact studies. However, these studies for a region yield more realistic…”
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Assessing the effects of climate change on monthly precipitation: Proposing of a downscaling strategy through a case study in Turkey by Okkan, Umut

“…The forecasting of future precipitation can be considered by using the outputs of the General Circulation Models (GCMs). In the study, a downscaling strategy…”
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Projecting aridity from statistically downscaled and bias-corrected variables for the Gediz Basin, Turkey by Kirdemir, Umut, Okkan, Umut, Fistikoglu, Okan

“…Abstract Due to climatological changes, a study was conducted in the Gediz Basin, Turkey, where agricultural production holds an important place. In the study…”
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The combined use of wavelet transform and black box models in reservoir inflow modeling by Okkan, Umut, Ali, Zafer Serbes

“…In the study presented, different hybrid model approaches are proposed for reservoir inflow modeling from the meteorological data (monthly precipitation,…”
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DİNAMİK SU BÜTÇESİ MODELİNE DESTEK VEKTÖR REGRESYONU ENTEGRASYONU by Okan Fıstıkoğlu, Umut Okkan, Zeynep Beril Ersoy

“…Yağış-akış modelleri kapsamında ele alınan modeller içerisinden kavramsal modeller havza dinamiğini atanan parametreler yardımıyla benzeştirmeye çalışırken,…”
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Application of Levenberg-Marquardt Optimization Algorithm Based Multilayer Neural Networks for Hydrological Time Series Modeling by OKKAN, Umut

“…It is very important to make hydrological time series modeling on water resource engineering and the decision making strategies of water resource management…”
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Statistical downscaling of monthly reservoir inflows for Kemer watershed in Turkey: use of machine learning methods, multiple GCMs and emission scenarios by Okkan, Umut, Inan, Gul

“…ABSTRACT In this study, statistical downscaling of general circulation model (GCM) simulations to monthly inflows of Kemer Dam in Turkey under A1B, A2, and B1…”
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Investigation of the Behavior of an Agricultural-Operated Dam Reservoir Under RCP Scenarios of AR5-IPCC by Okkan, Umut, Kirdemir, Umut

“…In regions where the Mediterranean climate prevails, the agricultural sector and agricultural-operated dam reservoirs are threatened by climate change. In this…”
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Evaluating climate change effects on runoff by statistical downscaling and hydrological model GR2M by Okkan, Umut, Fistikoglu, Okan

“…The main purpose of this study is to evaluate the impacts of climate change on Izmir-Tahtali freshwater basin, which is located in the Aegean Region of Turkey…”
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Prediction of unconfined compressive strength of carbonate rocks using artificial neural networks by Ceryan, Nurcihan, Okkan, Umut, Kesimal, Ayhan

“…The unconfined compressive strength (UCS) of intact rocks is an important geotechnical parameter for engineering applications. Determining UCS using standard…”
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Investigating adaptive hedging policies for reservoir operation under climate change impacts by Okkan, Umut, Fistikoglu, Okan, Ersoy, Zeynep Beril, Noori, Ahmad Tamim

“…•A nonlinear hedging rule was adapted to ensembles of climate-impact projections.•The adaptive hedging policy was effective in mitigating the…”
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Bayesian Learning and Relevance Vector Machines Approach for Downscaling of Monthly Precipitation by Okkan, Umut, Inan, Gul

“…AbstractIn this study, statistical downscaling of large-scale general circulation model (GCM) simulations to monthly precipitation of Kemer Dam, in Turkey, has…”
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Rainfall-runoff modeling using least squares support vector machines by Okkan, Umut, Serbes, Zafer Ali

“…Over the past decade, artificial neural networks (ANN) have been widely used in the runoff modeling studies. In spite of a number of advantages, ANN models…”
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Embedding machine learning techniques into a conceptual model to improve monthly runoff simulation: A nested hybrid rainfall-runoff modeling by Okkan, Umut, Ersoy, Zeynep Beril, Ali Kumanlioglu, Ahmet, Fistikoglu, Okan

“…•Machine learning algorithms were embedded into a monthly conceptual-lumped model.•The nested hybrid schemes use various conceptual outputs as auxiliary…”
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Statistical Downscaling of Monthly Precipitation Using NCEP/NCAR Reanalysis Data for Tahtali River Basin in Turkey by Fistikoglu, Okan, Okkan, Umut

“…Statistical downscaling methods describe a statistical relationship between large-scale atmospheric variables such as temperature, humidity, precipitation,…”
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Internal structure modification of a simple monthly water balance model via incorporation of a machine learning-based nonlinear routing by Okkan, Umut, Ersoy, Zeynep Beril, Fistikoglu, Okan

“…ABSTRACT Among various monthly water balance models, one of the models that has the simplest structure and offers a well-behaved conceptual platform is the…”
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Analyzing the uncertainty of potential evapotranspiration models in drought projections derived for a semi-arid watershed by Okkan, Umut, Fistikoglu, Okan, Ersoy, Zeynep Beril, Noori, Ahmad Tamim

“…Potential evapotranspiration (PET) serves as a proxy for estimating actual evapotranspiration (AET) in hydrological model simulations and constitutes an input…”
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Trends and amount changes of temperature and precipitation under future projections in high–low groups and intra-period for the Eastern Black Sea, the Wettest Basin in Türkiye by Nacar, Sinan, Şan, Murat, Kankal, Murat, Okkan, Umut

“…This study investigates the possible effects of climate change on temperature and precipitation variables in the Eastern Black Sea Basin, Türkiye’s wettest and…”
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Innovative Polygonal Trend Analysis (IPTA) in detecting the seasonal trend behavior of statistically downscaled precipitation for the Eastern Black Sea Basin of Turkey by Nacar, Sinan, Şan, Murat, Kankal, Murat, Okkan, Umut

“…This study compares projected and past seasonal precipitation trends in the Eastern Black Sea Basin, Turkey. Historical data from twelve stations representing…”
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Simulating Nature: a Philosophical Study of Computer-simulation Uncertainties and Their Role in Climate Science and Policy Advice by Okkan, Umut, İnan, Gül

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