Browsing by Author "Kemec, Serkan"

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Accessibility Analysis of Urban Green Space: the Case of Erbil City
(Konya Technical Univ, Fac Architecture & design, 2023) Kemec, Serkan; Abdalkarim, Salar Hassan
Urban green areas are open spaces in urban areas that are mainly covered by vegetation. They can be public or private urban green spaces that include parks, community gardens, forests, and nature reserves. Parks are an important component of urban quality of life if they are well designed and accessible. Accessible parks contribute to physical activity among urban residents. Therefore, the objective of the study was to identify the most significant main accessibility factors that discourage the use of public urban green areas, and examine the extent to which they influence the use of green areas in residential areas of the city of Erbil. This study was conducted in 2017 and 2020 to measure the accessibility of green spaces using network analysis with GIS for Erbil city. The present study represents the first known investigation regarding the accessibility of public green spaces within the city of Erbil. The results show that for community parks, 68% of the population has access with a travel time of 5 minutes, 99% of the population has access with a travel time of 10 minutes, and 100% of the population has access with a travel time of 15 minutes. For district parks, 70% of the population had access with 5 minute drive time. With 10-minute drive time, 96% of the population had access and 100% of the population had access with 15-minute drive time. For neighborhood parks, the results show that 43% of the population had access with 5-minute walk and, 71% of the population had access with 10-minute walk. At 15-minute walk time, 80% of Erbil residents had access to neighborhood parks. Mini parks were accessed by 22% of the population with a 5 minute walk and they were accessed by 52% of the population with a 10 minute walk. With a 15 minute walk, mini parks were accessible to 70% of the population.
Antropojenik Etkiler ve İklim Değişikliği Baskısı Altında Sulak Alanlar: Van Kalesi ve Çevresi Doğal Sit Alanı Örneği
(2023) Aydın, Emel; Kemec, Serkan
İklim değişikliği ve diğer antropojenik etkilere karşı kırılgan olan sulak alanlar, ekosistemdeki en verimli ve karbon açısından zengin bölgeler arasındadır. Özellikle kıyı sulak alanları, dolgu, yapılaşma ve yol gibi insan kaynaklı müdahalelerle tehdit altındadır. Çalışma, bir kıyı sulak alanı olan Van Kalesi ve Çevresi Doğal Sit Alanı ele almaktadır. Uygun mekânsal korelasyon ve regresyon yöntemleri kullanılarak yapılan analiz ve değerlendirmeler sonucunda, iklim değişikliği değişkenlerinde artma ve azalma eğilimleri olduğu tespit edilmiştir. Uydu görüntüleriyle yapılan ölçümler sulak alanda dolgu ve yol yapımı sebebiyle önemli oranda tahribat ve arazi kullanımı değişimi olduğunu göstermektedir. CORINE arazi örtüsü haritalarının analiz sonuçları arazi örtüsü değişimini desteklemekte ve sulak alanlarda azalma olduğunu göstermektedir. Çalışma sonucunda, alana yaklaşık 353.000 m² dolgu ve 8.5 km yol yapıldığı ve dolayısıyla şehirde müdahale edilen alan kadar ekosistem hizmetinin devre dışı kaldığı tespit edilmiştir. Daha büyük tahribatları önlemek amacıyla, alanın kesin korunacak alan ya da nitelikli koruma alanı olarak tescillenmesi gerekmektedir.
Development of a Tsunami Inundation Map in Detecting Tsunami Risk in Gulf of Fethiye, Turkey
(Springer Basel Ag, 2015) Dilmen, Derya Itir; Kemec, Serkan; Yalciner, Ahmet Cevdet; Duzgun, Sebnem; Zaytsev, Andrey
NAMIDANCE tsunami simulation and visualization tool is used to create tsunami inundation maps showing quantitative maximum tsunami flow depths in Fethiye. The risk of an extreme, but likely earthquake-generated tsunami is estimated at Fethiye Bay for 14 probabilistic earthquake scenarios. The bay is located 36A degrees 39'5aEuro(3)N 29A degrees 7'23aEuro(3)E, southwestern Turkey, which has coastline to the eastern Mediterranean Sea. The tsunami simulation and inundation assessment are performed in three stages: (1) formation of a digital elevation model of the region from the best available topography/bathymetry dataset, (2) estimation of a maximum credible tsunami scenario for the region and determination of related earthquake parameters, (3) high resolution tsunami simulation and computation of near shore and overland tsunami dynamics in the study area using tsunami simulation and visualization code NAMIDANCE, (4) determination of spatial distributions of tsunami characteristics (maximum water elevations, water velocities, flow depths) under the critical tsunami condition. The results are based on the most recent descriptions of potential tsunami sources, topographic and bathymetric databases, and tsunami numerical models. We present an innovative study concentrating on preparation of quantitative flow depths and inundation maps with a very high-resolution bathymetry/topographic dataset in the eastern Mediterranean. Inundation maps will be used to analyze the effects of possible tsunamis. The presented research is crucial to raising the awareness of government officials, the public, and other stake holders about the high probability of a tsunami event in Turkey. Moreover, the results of this study will help to plan for evacuation routes, establish safe zones, and assist in preparation for the tsunami, creating public awareness, and planning evacuation routes before the actual tsunami event happens.
The Evaluation of The Impacts of The Climate Change on Datca-Bozurun Spa With Geospatial Data and Techniques
(Bulgarian Cartographic Assoc, 2018) Kemec, Serkan
Climate change, a multi-component phenomenon, affects the biodiversity at all levels from the organisms to biomes. Climate change components could be listed as; temperature, rainfall, extreme events, CO2 concentration, Ocean / Sea dynamics. Sea-water temperatures and sea level changes in the world and Mediterranean scale, at local scale, the temperature and precipitation data related to the area, CORINE Land Cover data, Normalied Difference Vegetation Index (NDVI) products, have been investigated for the potential use to determine the possible effects of climate change on the Datca - Bozburun SPA by using endangered flora and fauna species observation data. Results of the study showed that evaluated spatial data and spatial decision support tools have huge potential to construct specific, measurable, achievable, realistic and timely strategies to preserve the SPA's from the negative effects of the climate change.
Kentsel Yeşil Alanların Planlamasında Kullanılan Konumsal Analiz Yöntemleri ve Kullanım Olanakları
(2023) Yeler, Okan; Kemec, Serkan; Satır, Onur
Çalışmanın amacı, kentsel yeşil alan planlaması ve konumsal analizlerin kullanım olanaklarını, dünyadaki bilimsel literatürlerdeki yerini ve konuyla ilgili genel olarak yapılabilecek çalışmaları, farklı literatürlerden elde edilen orijinal çıkarımlar üzerinden analizini yapmaktır. Çalışma kapsamında, kentsel yeşil alan kavramı, yeşil alanların sınıflandırılması, kentsel planlama ve Coğrafi Bilgi Sistemleri (CBS), mekânsal analizlerin yeşil alan planlamasında kullanımı ve coğrafi bilgi teknolojileri yardımıyla kentsel yeşil alan planlaması konularında ülkemiz ve dünya literatürlerindeki eğilimler irdelenmiştir. Sonuç olarak; genel literatürde otonom sistemlerin oluşturulması ve akıllı şehirler kapsamında yeşil alan planlamasına yönelik çalışmaların, ulaşım ve erişim imkanlarına odaklanan nitelikli planlama yaklaşımlarının, kent ölçeğinde, çevre biyolojisi, toprak ve rehabilitasyon konularında coğrafi veriye dayalı çalışmaların yetersiz olduğu tespit edilmiştir. Konuyla ilgili en çok bilimsel yayın yapılan dergiler incelendiğinde, ilk 10’a giren dergilerin çoğunluğunun Web of Science (WOS) veri tabanında Quarter-1 (Q1) kategorisindeki dergiler olduğu, dolayısıyla yüksek kalitedeki dergilerde konuyla ilgili çalışmaların yayınlandığı görülmüştür. Ülkeler bazında bilimsel katkı açısından değerlendirildiğinde konuyla ilgili en etkin çalışmaların Finlandiya’da yapıldığı belirlenmiştir.
A New Lod Definition Hierarchy for 3d City Models Used for Natural Disaster Risk Communication Tool
(Bulgarian Cartographic Assoc, 2012) Kemec, Serkan; Zlatanova, Sisi; Duzgun, Sebnem
Taking precautions before a disaster to reduce the causalities and losses engendered by natural disasters is relatively cheaper, and more importantly, better than cure. The authors propose a conceptual framework with the consideration of all stakeholders related to the disaster management to have a better risk management, and to guide the design, implementation and integration of the 3D urban modeling tools into disaster risk visualization. In this study, a new indoor LoD hierarchy is proposed for building objects. The LoD definitions of CityGML are only for the external parts of the city structures and the indoor is modeled in one LoD only. Similar to the outdoor definitions of CityGML, the proposed indoor LoD definitions aim to achieve robust definitions. This framework allows visualization in all the possible 3D urban disaster situations.
Residents' Satisfaction in Post-Disaster Permanent Housing: Beneficiaries Vs. Non-Beneficiaries
(Elsevier, 2022) KamacI-Karahan, Ebru; Kemec, Serkan
This paper examines the satisfaction of residents living in post-disaster permanent housing, with particular emphasis on the pre-disaster neighborhood experiences and beneficiary status. Data were obtained by a face-to-face questionnaire survey (N = 171) conducted between January 15 and May 25, 2014, in Sihke post-disaster permanent housing, which was built after the 2011 Van earthquakes in Turkey. Pearson's correlation analysis was used to measure the effect of the relationships between the variables used in the regression analysis. An independent sample t-test was used to assess residents' evaluations of the physical and social settings in the pre-disaster and present resettlement areas, based on their ownership status (beneficiaries versus non beneficiaries). Hierarchical multiple regression analysis was used to determine which factors influenced overall satisfaction with the neighborhood, with beneficiary status, past residential experiences, the social environment, and socio-demographic factors as controlling variables. The preliminary findings show that being a beneficiary, the pre-disaster and current neighborhood environments, and social ties are dimensions and predictors of residents' satisfaction with post-disaster permanent housing in the context of Van, Turkey.
Simulating the Impact of Natural Disasters on Urban Development in a Sample of Earthquake
(Springer, 2023) Satir, Onur; Kemec, Serkan; Yeler, Okan; Akin, Anil; Bostan, Pinar; Mirici, Merve Ersoy
Natural disasters have been increased in areas, where people live densely, day by day. Istanbul 1999, Van 2011, and Izmir 2020 earthquakes were just some of the tragic events in the near past in Turkiye. The aim of this study was to define Van 2011 earthquakes effects as a sample on urban development by using land use/land cover projecting techniques. In this case, Van urban development (in urban macroform scale) was simulated without Van 2011 earthquakes based on existing urban development using the Cellular Automata Markov Chain (CA-MARKOV) approach for the year 2018. Effects of the earthquake were determined on urban development by comparing modeling results with observed 2018 built up areas. So that significant physical and social driving factors were evaluated including road distance, slope, hillshade, ground stability, and land use ability, and weighting values on urban development were calculated under the influence of the natural disaster. Van urban built up areas were mapped using high-spatial resolution remote sensing instruments such as SPOT, ASTER, RapidEye, and Gokturk 2 satellite dataset for 1988-2002-2011, and 2018 images applying an object-based classification approach (OBC). First of all, the model was validated using 1988, 2002, and 2011 urban development maps. The Kappa accuracy was found to be 0.85, respectively, for the model. Defined urbanization drivers were applied to the 2002-2011 time period to simulate 2018 urban areas without any earthquake. The results indicated that urban areas were affected by earthquakes. If there was no earthquake, urban development to the periphery would be 30% less. Additionally, 10% more built up areas would be constructed on ground sensitive areas, and only 2% of the new constructions would be established on suitable lands. Today this ratio is around 8%. As a result, urban development has been a trend to move from flat land to slight slopes and has been moved away from roads and settlements. It was determined that the spread into the city was accelerated as well as spread toward the periphery due to the earthquake.