Kirkil, Gökhan
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K.,Gokhan
G. Kirkil
Kirkil,Gokhan
Kirkil,G.
GÖKHAN KIRKIL
Kirkil, Gokhan
K., Gokhan
Kirkil, G.
Gökhan KIRKIL
Kirkil G.
Gökhan Kirkil
Gokhan, Kirkil
KIRKIL, Gökhan
K., Gökhan
KIRKIL, GÖKHAN
Kirkil, GÖKHAN
Kirkil, Gökhan
Kirkil, Gökhan
Kirkil, Gökhan
G. Kirkil
Kirkil,Gokhan
Kirkil,G.
GÖKHAN KIRKIL
Kirkil, Gokhan
K., Gokhan
Kirkil, G.
Gökhan KIRKIL
Kirkil G.
Gökhan Kirkil
Gokhan, Kirkil
KIRKIL, Gökhan
K., Gökhan
KIRKIL, GÖKHAN
Kirkil, GÖKHAN
Kirkil, Gökhan
Kirkil, Gökhan
Kirkil, Gökhan
Job Title
Doç. Dr.
Email Address
Main Affiliation
Civil Engineering
Status
Current Staff
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ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
15
LIFE ON LAND
0
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
14
LIFE BELOW WATER
1
Research Products
6
CLEAN WATER AND SANITATION
0
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
4
Research Products
4
QUALITY EDUCATION
2
Research Products
2
ZERO HUNGER
0
Research Products
10
REDUCED INEQUALITIES
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
16
Research Products
13
CLIMATE ACTION
14
Research Products
1
NO POVERTY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
3
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
7
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
4
Research Products
5
GENDER EQUALITY
0
Research Products
Documents
38
Citations
1468
h-index
15
Documents
36
Citations
1408
Scholarly Output
39
Articles
17
Views / Downloads
275/3248
Supervised MSc Theses
12
Supervised PhD Theses
0
WoS Citation Count
286
Scopus Citation Count
382
WoS h-index
7
Scopus h-index
8
Patents
0
Projects
0
WoS Citations per Publication
7.33
Scopus Citations per Publication
9.79
Open Access Source
25
Supervised Theses
12
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| Journal | Count |
|---|---|
| Computation | 2 |
| Monthly Weather Review | 2 |
| Physics of Fluids | 2 |
| Energies | 2 |
| Applied Sciences-Basel | 1 |
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39 results
Scholarly Output Search Results
Now showing 1 - 10 of 39
Article Citation - WoS: 1Citation - Scopus: 2The Role of Hydrogen in the Energy Mix: a Scenario Analysis for Turkey Using Osemosys(Mdpi, 2024) Tetik, Hepnur; Kirkil, GokhanThe urgent need to tackle climate change drives the research on new technologies to help the transition of energy systems. Hydrogen is under significant consideration by many countries as a means to reach zero-carbon goals. Turkey has also started to develop hydrogen projects. In this study, the role of hydrogen in Turkey's energy system is assessed through energy modeling using the cost optimization analytical tool, Open Source Energy Modelling System (OSeMOSYS). The potential effects of hydrogen blending into the natural gas network in the Turkish energy system have been displayed by scenario development. The hydrogen is produced via electrolysis using renewable electricity. As a result, by using hydrogen, a significant reduction in carbon dioxide emissions was observed; however, the accumulated capital investment value increased. Furthermore, it was shown that hydrogen has the potential to reduce Turkey's energy import dependency by decreasing natural gas demand.Master Thesis Enerji Kullanımında Avrupa Yeşil Mutabakatı'nın Karbonsuzlaşma Hedeflerinin İncelenmesi(2023) Tan, Sadık Erkan; Ediger, Şevket Volkan; Kirkil, Gökhanİklim değişikliğinin nedeni insanların fosil yakıtları kullanarak atmosferdeki sera gazlarını arttırması ve Dünya'nın enerji dengesini bozmasıdır. Çözüm ise zor ve dikkatli bir karbonsuzlaşma sürecini gerektirmektedir. Sera gazı salımının azaltılması, yenilenebilir enerji kaynaklarının kullanımının arttırılması ve enerji verimliliğinin arttırılması en çok kabul gören karbonsuzlaşma hedefleridir. AB, 2019 yılında Avrupa Yeşil Mutabakatı adında iddialı ve kapsamlı bir karbonsuzlaşma politikası açıklayarak 2050 yılında ilk karbonsuzlaşmış kıta olacaklarını duyurdu. Fosil yakıt kaynaklarından yenilenebilir enerji kaynaklarına doğru enerji geçişini sağlamaya yönelik birçok strateji, hedef, ekonomik mekanizmalar oluşturuldu. AB'nin 2050 yılında tamamen karbonsuzlaşmış bir kıta olabilmesi için yaklaşık son üç yüzyıldır yüksek oranlarda fosil bağımlısı olmuş enerji sektörlerinde enerji geçişini sağlaması en zor olan kısımdır. Bu enerji geçişi ve karbondan arındırma süreci için en zorlayıcı sorulardan biri: 'Enerji kullanımında Avrupa Yeşil Mutabakatı'nın karbonsuzlaşma hedeflerine ulaşılması mümkün mü?'. Bu soruyu cevaplamak için, AB'nin kurucu antlaşmaları, direktifleri, enerji stratejileri ve 2020 hedefleri doğrultusunda 2030 ve 2050 hedefleri analiz edildi. Literatürde yapılan araştırmalar AB'nin ve AB ülkelerinin hedeflerini, politikalarını birçok farklı metotla incelemiş olmalarına rağmen en çok enerji tüketime sahip olan Almanya, Fransa, İtalya ve İspanya bir arada incelenmemiştir. Bu amaçla, bu tez en çok enerji tüketimine sahip dört AB ülkesinin stratejilerini ve hedeflerini ile bu hedeflere ulaşma başarılarını analiz edip karşılaştırmalı bir şekilde değerlendirmiştir. Çalışmanın sonunda enerji dönüşümünde ve karbonsuzlaşmada AB'nin ve seçilen dört ülkenin 2030 hedeflerinden yenilenebilir enerji ve sera gazı azaltım hedeflerine ulaşabileceğinden ama enerji verimliliği hedeflerine ulaşamayacağın ve benzer bir sonucun 2050 hedefleri için de gerçekleşeceği ileri sürülmektedir.Article An Integrated Framework for Internal Replenishment Processes of Warehouses Using Approximate Dynamic Programming(MDPI, 2025) Kalafat, Irem; Hekimoglu, Mustafa; Yucekaya, Ahmet Deniz; Kirkil, Gokhan; Ediger, Volkan S.; Yildirim, SendaWarehouses are vital in linking production to consumption, often using a forward-reserve layout to balance picking efficiency and bulk storage. However, replenishing the forward area from reserve storage is prone to delays and congestion, especially during high-demand periods. This study investigates the strategic use of buffer areas-intermediate zones between forward and reserve locations-to enhance flexibility and reduce bottlenecks. Although buffer zones are common in practice, they often lack a structured decision-making framework. We address this gap by developing an optimization model that integrates demand forecasts to guide daily replenishment decisions. To handle the computational complexity arising from large state and action spaces, we implement an approximate dynamic programming (ADP) approach using certainty-equivalent control within a rolling-horizon framework. A real-world case study from an automotive spare parts warehouse demonstrates the model's effectiveness. Results show that strategically integrating buffer zones with an ADP model significantly improves replenishment timing, reduces direct picking by up to 90%, minimizes congestion, and enhances overall flow of intra-warehouse inventory management.Conference Object Citation - WoS: 1Citation - Scopus: 1Modeling of Wind Effects on Stratified Flows in Open Channels: a Model for the Istanbul Strait (bosphorus)(2016) Bilge, Ayşe Hümeyra; Kirkil, Gökhan; Burak, Selmin; İncegül, MetehanStratified flows in open channels arise as a result of density or surface level differences. If the channel is connected to a basin at one or both ends, strong winds originating from the basin cause the "wind setup" effect that increases the water level at the entrance of the channel. On the other hand, along the channel, persistent winds in the upper layer flow direction lead to an increase of the drift velocity and to a decrease in upper layer flow depth. The Istanbul Strait (Bosphorus) connecting the Black and the Marmara Seas, is characterized by a stratified flow caused by the surface level and salinity difference between these basins, consisting of a southward upper layer flow and a northward lower layer flow. Along the strait, there are three hydraulic control points; the north sill, a midway contraction reach and the south sill. Under wind effects, the northern and southern entrances of the strait behave as an estuary whereas the midway reach to the south of the contraction acts as as an open channel. In winter, when the sea level difference is relatively low, the wind setup due to southerly winds may cause a blockage and even reversal of the upper layer flow. On the other hand in spring when there is excessive river discharge, northerly winds increase the influx of Black Sea waters into the strait and may lead to a blockage of the lower layer. We claim that strong northerly winds may cause a decrease of the upper layer depth beyond the contraction and we propose a simple model for its estimation in terms of the wind and water flow speeds.Article Citation - Scopus: 101Resolved Turbulence Characteristics in Large-Eddy Simulations Nested Within Mesoscale Simulations Using the Weather Research and Forecasting Model(2014) Mirocha, Jeff; Kosovic, Branko; Kirkil, GökhanOne-way concurrent nesting within the Weather Research and Forecasting Model (WRF) is examined for conducting large-eddy simulations (LES) nested within mesoscale simulations. Wind speed spectra and resolved turbulent stresses and turbulence kinetic energy from the nested LES are compared with data from nonnested simulations using periodic lateral boundary conditions. Six different subfilter-scale (SFS) stress models are evaluated using two different nesting strategies under geostrophically forced flow over both flat and hilly terrain. Neutral and weakly convective conditions are examined. For neutral flow over flat terrain turbulence appears on the nested LES domains only when using the two dynamic SFS stress models. The addition of small hills and valleys (wavelengths of 2.4 km and maximum slopes of ±10°) yields small improvements with all six models producing some turbulence on nested domains. Weak convection (surface heat fluxes of 10 Wm-2) further accelerates the development of turbulence on all nested domains. However considerable differences in key parameters are observed between the nested LES domains and their nonnested counterparts. Nesting of a finer LES within a coarser LES provides superior results to using only one nested LES domain. Adding temperature and velocity perturbations near the inlet planes of nested domains shows promise as an easy-to-implement method to accelerate turbulence generation and improve its accuracy on nested domains. © 2014 American Meteorological Society.Conference Object Citation - Scopus: 1Genesys-Mod Turkey: Quantitative Scenarios for Low Carbon Futures of the Turkish Energy System(IEEE Computer Society, 2022) Hasturk, I.S.; Celebi, E.; Yucekaya, A.D.; Kirkil, G.This paper examines the quantitative scenarios for low-carbon futures of the Turkish energy system at aggregated (country level) and regionally disaggregated (NUTS-1 level) levels. We have employed four different storylines for the future European energy system. They are quantified and implemented for the European energy system (30 regions, mostly single countries, including Turkey) using the open-source global energy system model, GENeSYS-MOD v3.0. We have compared the results of all scenarios at aggregated and disaggregated levels and found that there are significant differences among them. Specifically, the hydrogen production (and its use) has increased considerably in the disaggregated model when compared to the aggregated level results. The major reason for these differences is found to be the better estimation of regional renewable capacity factors (wind and solar) in the disaggregated level compared to aggregated level. © 2022 IEEE.Article Citation - WoS: 36Citation - Scopus: 41Turkish Public Preferences for Energy(Elsevier Science, 2018) Ediger, Volkan S.; Kirkil, Gökhan; Çelebi, Emre; Ucal, Meltem Şengün; Kentmen-Cin, ÇiğdemPublic concern over energy supplies prices sustainability and efficiency has emerged as a major issue around the world. Yet most of what we know regarding public opinion on energy comes from North America and Europe. This paper presents the results from the 2016 Turkish Public Preferences for Energy Survey which included 1204 respondents and examined Turkish residents' household energy consumption energy policy preferences and environmental concerns. The main findings were that Turkish citizens consider natural gas and electricity highly expensive view dependence on imported energy as Turkey's most pressing energy challenge and recognize the problem of climate change. This lends public support for wind and solar power but at the same time energy issues and the environment policies of political parties do not affect voting choices and political preferences.Conference Object A Numerical Study of Shallow Mixing Development Over Flat Surface and Dunes(TSINGHUA UNIV, 2013) Kirkil, Gökhan; Constantinescu, GeorgeResults of a high resolution Detached Eddy Simulation (DES) are used to characterize the evolution of a shallow mixing layer developing between two parallel streams in a long open channel with a smooth flat bed and dunes. The study discusses the vertical non-uniformity in the mixing layer structure and provides a quantitative characterization of the growth of the large-scale quasi two-dimensional (2D) coherent structures with the distance from the splitter plate. Results show that in streamwise sections situated between 75D (D is the channel depth) and 150D from the splitter plate the width of the mixing layer close to the free surface is 20-30% more than the width in the near-bed region in the case in which the channel bed is flat. This is mostly because of the tilting of the mixing layer interface on the low-speed side toward the low speed stream as the free surface is approached. Power spectra of the horizontal velocity components show the presence of a -3 subrange at streamwise locations situated more than 10D from the splitter plate consistent with the presence of large-scale quasi 2D horizontal eddies and the transfer of energy (inverse energy cascade) from the smaller scales toward these eddies. Consistent with visualizations of the mass transport of a passive scalar within the mixing layer close to the free surface the estimated streamwise length of the quasi 2D mixing layer eddies is about 2.5 to 3.0 times larger than the local width of the mixing layer. The presence of large-scale roughness elements in the form of an array of two-dimensional dunes with a maximum height of 0.25D (D is the channel depth) induces a much more rapid and larger shift of the centerline of the mixing layer due to the increased influence of the bottom roughness.Master Thesis Decarbonization Potentials in the Turkish Energy Intensive Industries(Kadir Has Üniversitesi, 2021) Ünlü, Begüm; Kirkil, GökhanBiyoçeşitlilik ve iklim krizi ile mücadelede uluslararası kuruluşların önderliğinde küresel ısınmayı minimumda tutmak üzere bir dizi önlem alınmaktadır. Önlemlerden biri olan sera gazı emisyonlarının azaltılması için öncelikle enerji sektöründe yoğun karbonlu kaynaklardan düşük karbonlulara geçiş sağlanmaktadır. Lakin sadece enerji geçişinin emisyonları azaltmak için yeterli olmadığı bilinmektedir. Bu nedenle küresel emisyon salınımında enerjiden sonra ikinci sırada gelen sanayi sektöründe karbonsuzlaştırma yöntemlerine ağırlık verilmektedir. Çoğu gelişmiş ülkenin çalışmalarında Enerji Yoğun Endüstri olarak sınıflandırılan, üretim sürecinde yoğun enerji harcayan ve yoğun emisyona sebep olan alt sektörlere özel karbonsuzlaştırma önerileri kapsamlı bir şekilde ele alınmaktadır. Türkiye Sanayisi ise teknolojik araştırma ve geliştirmeleri enerji verimliliğine odaklanarak gerçekleştirmektedir. Karbonsuzlaştırma seçenekleri enerji verimliliğini de içine alan geniş bir yelpaze sunduğu için Türk Sanayisi tarafından da benimsenmelidir. Bu çalışma Türkiye'de üretim yapan enerji yoğun endüstrilerde karbonsuzlaştırma potansiyelini sunmayı amaçlamıştır. Çalışmada öncelikle karbonsuzlaştırma kavramı ve iklim krizi ile mücadalede ön saflarda yer alan uluslarası kuruluşların karbonsuzlaştırmaya bakış açısı incelenmiştir. Ardından küresel çapta uygulanan karbonsuzlaştırma seçenekleri araştırılıp enerji yoğun endüstrilere özel çözümler saptanmıştır. Daha sonra Türkiye'de enerji yoğun endüstriler alt sektör bazında incelenmiş ve uygun olan karbonsuzlaştırma önerileri sunulmuştur. Bu önerilerin hayata geçmesi için hükümetin, kuruluş ve sanayicilerin iklim krizi ile mücadelede küresel hedeflere uygun, ortak bir yaklaşım benimsemesi gerekmektedir. Ancak bu sayede sanayide karbonsuzlaştırma seçeneklerinin değerlendirilmesi mümkün olabilecektir.Article Citation - Scopus: 63Transition and Equilibration of Neutral Atmospheric Boundary Layer Flow in One-Way Nested Large-Eddy Simulations Using the Weather Research and Forecasting Model(2013) Mirocha, Jeffrey D.; Kirkil, Gökhan; Bou-Zeid, Elie; Chow, Fotini Katopodes; Kosovic, BrankoThe Weather Research and Forecasting Model permits finescale large-eddy simulations (LES) to be nested within coarser simulations an approach that can generatemore accurate turbulence statistics and improve other aspects of simulated flows.However errors are introduced into the finer domain fromthe nestingmethodology. Comparing nested domain flat-terrain simulations of the neutral atmospheric boundary layer with singledomain simulations using the same mesh but instead using periodic lateral boundary conditions reveals the errors contributed to the nested solution from the parent domain and nest interfaces. Comparison of velocity spectra shows good agreement among higher frequencies but greater power predicted on the nested domain at lower frequencies. Profiles of meanwind speed show significant near-surface deficits near the inflowboundaries but equilibrate to improved values with distance. Profiles of the vertical flux of x momentum show significant underprediction by the nested domain close to the surface and near the inlet boundaries. While these underpredictions of the stresses which cause the near-surface velocity deficits attenuate with distance within the nested domains significant errors remain throughout. Profiles of the resolved turbulence kinetic energy show considerable deviations from their single-domain values throughout the nested domains. The authors examine the accuracy of these parameters and their sensitivities to the turbulence subfilter stress model mesh resolution and grid aspect ratio and provide guidance to practitioners of nested LES. © 2013 American Meteorological Society.
