Browsing by Author "Dinçer, Ali Ersin"

Now showing 1 - 7 of 7

Batık Minarelerde Su Seviyesinin Yapıya Olan Etkisinin Sayısal Olarak İncelenmesi
(Iğdır Üniversitesi, 2021) Demir, Abdullah; Dinçer, Ali Ersin; 0000-0002-6392-648X; 0000-0002-4662-894X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Demir, Abdullah; Dincer, Ali Ersin
Baraj göllerinin, sular altında bıraktığı yerleşim yerlerinin, su üstünde kalan son mirasları minarelerdir. Türkiye’de iki adet batık minare bulunmaktadır ve su üstünden görülebilmeleri ile cazibe merkezleri haline gelmişlerdir. Uzun yıllar sular altında kalması bu yapıların malzeme kalitesinin düşmesine sebep olmuştur/olacaktır. Bunun yanında; olası bir deprem esnasında var olan zemin hareketine ek olarak suyun çalkalanma etkisinin de eklenmesi bu minarelerin davranışlarının öngörülmesini daha da zorlaştırmaktadır. Yüksek Deprem riski barındıran bölgelerde yer alan her bu yapıların deprem esnasında su ile yapacağı etkileşimin sonuçlarının irdelenmesi gerekmektedir.Bu kapsamda su altında kalan minarelerin davranışlarını incelemek için idealleştirilmiş 2 boyutlu model oluşturulmuş ve yakın fay hareketleri uygulanmıştır. İdealleştirilmiş modelin analizi için tam akupajlı bir yapı-sıvı etkileşim (FSI) modeli kullanılmıştır. Bu modelde yapı kısmın modellenmesi için sonlu elemanlar yöntemi (FEM), sıvı kısmın modellenmesi için ise yumuşatılmış parçacık hidrodinamiği (SPH) kullanılmıştır. Bu iki farklı yöntem ile modellenen alanların etkileşimi için ise kontak mekanik kullanılmıştır. Kullanılan FSI yöntemi birçok problemin çözümü ile doğruluğu kanıtlanan geçerli bir yöntemdir. Farklı su seviyeleri ile oluşturulan idealleştirilmiş modeller, geliştirilen FSI yöntemi ile analiz edilmiş ve sonuçlar karşılaştırmalı olarak sunulmuştur. Elde edilen sonuçlar batık minarelerde su kütlesi etkisinin yakın fay altında ne kadar yüksek olduğunu ortaya koymaktadır. Su seviyesindeki değişim ile bu etki doğal olarak değişim göstermektedir. Çalışma kapsamında farklı su seviyeleri incelenerek batık minareler üzerindeki su kütlesi etkisi ayrıntılı olarak incelenmiştir.
Comparative analysis of hybrid geothermal-solar systems and solar PV with battery storage: Site suitability, emissions, and economic performance
(ELSEVIER, 2024) Fedakar, Halil Ibrahim; Dinçer, Ali Ersin; Demir, Abdullah; 0000-0002-7561-5363; 0000-0002-4662-894X; 0000-0002-6392-648X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Fedakar, Halil Ibrahim; Dinçer, Ali Ersin; Demir, Abdullah
Renewable energy integration has become a critical focus in the global effort to reduce carbon emissions and diversify energy sources. In regions with distinct geographic features, such as Türkiye, combining different renewable technologies can offer enhanced energy security. This study investigates the site suitability and economic and environmental performance of hybrid geothermal-solar systems and solar PV systems with battery storage across the provinces of Osmaniye, Hatay, and Kilis, of Türkiye. Using the fuzzy-AHP method, site suitability is evaluated, addressing a key gap in comparing these systems' adaptability to varying geographic conditions. This study is the first to directly compare these two renewable energy technologies in terms of site suitability. The findings reveal significant differences in site suitability, with solar PV systems with battery storage demonstrating broader applicability across the region. The suitable sites (20–100 % suitability) cover 1260.82 km² for solar PV systems with battery storage and only 122.18 km² for hybrid geothermal-solar systems. In terms of environmental impact, hybrid geothermal-solar systems exhibit significantly lower carbon emissions, averaging 44.6 kg CO₂/MWh, compared to 123.8 kg CO₂/MWh for solar PV systems with battery storage. Economically, hybrid geothermal-solar systems also outperform with a lower levelized cost of electricity of $0.091 kWh versus $0.254 kWh for solar PV systems. These results highlight the environmental and economic advantages of hybrid geothermal-solar systems, while also emphasizing their limited scalability to regions with geothermal activity. Conversely, solar PV systems, despite their higher emissions and costs, offer greater flexibility and potential for widespread deployment.
Exploring flood and erosion risk indices for optimal solar PV site selection and assessing the influence of topographic resolution
(PERGAMON-ELSEVIER SCIENCE LTD, 2023) Yılmaz, Kutay; Dinçer, Ali Ersin; Ayhan, Elif N.; 0000-0002-4662-894X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Dinçer, Ali Ersin
This study explores the suitability of Mentes,e Region in Turkiye for the installation of solar PV farms, given the significant increase in energy demand in the country and the need to reduce reliance on fossil fuels. The Analytical Hierarchy Process (AHP) method, which has been widely used in previous studies, is employed to identify the most influential criteria for site selection, including environmental, economic, and social factors. However, this study introduces two new factors, flood hazard and erosion indices, to the analysis, which are crucial in areas susceptible to these hazards. The results show that approximately 7.5% of the study surface area is suitable for solar PV production. The study reveals that flood hazard and erosion indices have an effect on the suitable sites despite their relatively lower weights in the AHP. In addition, the study illustrates that site selection can be carried out using topographic data of lower resolution, as long as the data is resampled to match the resolution of land use data. The study is novel in its integration of flood and erosion risk indices in the decision process and its investigation of the influence of topographic resolution on site selection for solar PV panels.
A Fully Coupled Numerical Model for Unbonded Post-tensioned Timber Structures
(SPRINGER LINK, 2024) Dinçer, Ali Ersin; Demir, Abdullah; 0000-0002-4662-894X; 0000-0002-6392-648X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Dinçer, Ali Ersin; Demir, Abdullah
The paper presents a fully Lagrangian mesh-free solver to simulate the dynamic behavior of post-tensioned timber structures. Weakly Compressible Smoothed Particle Hydrodynamics (SPH) is employed to model both the timber and the tendon. An efficient and simple coupling method between the timber and the tendon is proposed by considering the numerical stability. Besides, the same coupling algorithm is used to model the interaction between column and beam elements. Although the column is treated as rigid in the simulations, the coupling algorithm accounts for the initial compression of the column resulting from post-tensioning. For the verification of the code for solids and material nonlinearity of timber, benchmark problems available in the literature are used. Finally, the solver's capability is demonstrated through dynamic analysis of post-tensioned timber structures. The solutions obtained for all the cases are in good agreement with the experimental and theoretical data, which indicates the applicability and accuracy of the solver.
The impact of Kahramanmaraş (2023) earthquakes: A comparative case study for Adıyaman and Malatya
(ELSEVIER, 2024) Dinçer, Ali Ersin; Dincer, N. Nergiz; Tekin-Koru, Ayça; Yaşar, Burze; Yılmaz, Zafer; 0000-0002-4662-894X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Dinçer, Ali Ersin
This study examines the effects of two major earthquakes of magnitude 7.7 and 7.6 that struck Kahramanmaraş on February 6th, 2023, followed by a magnitude 6.4 quake in Hatay on February 20th, which caused major damage in 11 Turkish provinces. The study focuses on Adıyaman and Malatya and uses an interdisciplinary approach to analyze the economic and environmental impacts. Primary data sources, including field visits and interviews, reveal clear labor-related challenges in both provinces, characterized by a government-induced labor shortage. In both provinces, physical capital has been severely damaged, particularly affecting small businesses, historic bazaars, and old industrial areas. The impact on businesses varies by size and location, with Adıyaman suffering more severe setbacks than other cities. The shortage of skilled labor related to the earthquake damage affects the quality of production, which can have a serious economic impact. Transportation disruptions continue to hamper supply chains and affect companies' ability to meet their export commitments. The environmental consequences, particularly the large amount of debris, pose a major challenge. The lack of a comprehensive disaster waste plan at the central government level leads to inadequate waste management. The study recommends sorting the debris at temporary sites to obtain reusable items while paying attention to the sustainability and transparency of debris management processes. In summary, this comparative case study highlights the need for tailored approaches to address the different impacts in the 11 provinces. A one-size-fits-all solution is insufficient and an individual needs assessment is needed for each province in order to implement targeted economic and environmental recovery measures.
A Novel Procedure for the AHP Method for the Site Selection of Solar PV Farms
(Wiley-Hindawi, 2024) Demir, Abdullah; Dinçer, Ali Ersin; Yilmaz, Kutay; 0000-0002-6392-648X; 0000-0002-4662-894X; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Demir, Abdullah; Dinçer, Ali Ersin
This study proposes a novel approach to enhance the analytic hierarchy process (AHP) for the selection of suitable sites for solar photovoltaic (PV) farms. This approach is particularly beneficial when it is possible to establish a predefined objective relation in the final weights of the AHP method. The methodology focuses on achieving this predefined relation introducing a systematic revision of the constants of related constraints. In this study, the costs of constructing a unit transmission line and road in the Kayseri Province are objectively related, and the initial constant matrix of the AHP method is iteratively revised until the relation of the final weights converges to the predefined one. The suitability of solar PV farm locations is classified into five classes, revealing approximately 28% (40-100% of suitability) of the province as favorably suitable and designating about 67% as restricted zones. The findings reveal notable distinctions between the revised weights and those derived from the conventional AHP method. The disparity in weights for various constraints varies from 13.5% to 7.2%. Consequently, the alterations in the area of suitability regions range from 3.4% to 50%. The revision of AHP weights results in a reduction in higher-suitability areas, coupled with a significant expansion in the region exhibiting lower suitability. Notably, the extent of change in the suitability map increases when the difference in ratios between two criteria obtained from the AHP and the predefined objective relation is high. The proposed method demonstrates its applicability in regions like Kayseri where an objective relation between criteria can be established. Given the inherent subjectivity of the AHP method, the proposed procedure becomes essential to attain more objective weights. Since the methodology objectively adjusts weights based on known ratios, it increases the accuracy and reliability of site selection studies.
Wind farm site selection using GIS-based multicriteria analysis with Life cycle assessment integration
(SPRINGER, 2024) Demir, Abdullah; Dinçer, Ali Ersin; Çiftçi, Cihan; Gülçimen, Sedat; Uzal, Nigmet; Yılmaz, Kutay; 0000-0002-6392-648X; 0000-0002-4662-894X; 0000-0001-9199-6437; 0000-0002-8967-3484; 0000-0002-0912-3459; AGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü; Demir, Abdullah; Dinçer, Ali Ersin; Çiftçi, Cihan; Gülçimen, Sedat; Uzal, Nigmet
The sustainability of wind power plants depends on the selection of suitable installation locations, which should consider not only economic and technical factors including manufacturing and raw materials, but also issues pertaining to the environment. In the present study, a novel methodology is proposed to determine the suitable locations for wind turbine farms by analyzing from the environmental perspective. In the methodology, the life cycle assessment (LCA) of wind turbines is incorporated into the decision process. The criteria are ranked using analytical hierarchy process (AHP). The study area is chosen as the western region of Türkiye. The obtained suitability map reveals that wind speed is not the sole criterion for selecting a site for wind turbine farms; other factors, such as bird migration paths, distance from urban areas and land use, are also crucial. The results also reveal that constructing wind power plants in the vicinity of İzmir, Çanakkale, Istanbul, and Balıkesir in Türkiye can lead to a reduction in emissions. İzmir and its surrounding area show the best environmental performance with the lowest CO2 per kilowatt-hour (7.14 g CO2 eq/kWh), to install a wind turbine due to its proximity to the harbor and steel factory across the study area. Çanakkale and the northwest region of Türkiye, despite having high wind speeds, are less environmentally favorable than İzmir, Balıkesir, and Istanbul. The findings of LCA reveal that the nacelle and rotor components of the wind turbine contribute significantly (43–97%) to the environmental impact categories studied, while the tower component (0–36%) also has an impact.