TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14365/4
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Article Göl Kirliliği Probleminin Çözümü için Hızlı ve Güvenilir Bir Sayısal Yaklaşım(2025-07-15) Gümgüm, SevinSu, hava gibi çevrenin temel bileşenlerinden biridir ve su kaynaklarının bozulması tüm canlı organizmaları tehdit etmektedir. Bu nedenle su kirliliği sorununu araştırmak büyük önem taşımaktadır. Göller, su kaynaklarının büyük bir bölümünü oluşturmaktadır. Bu çalışmanın amacı, üç adet birbiriyle bağlantılı gölden oluşan bir sistemdeki kirlilik dinamiklerini Gegenbauer dalgacık yöntemi ile analiz etmektir. Problem, her bir göldeki kirlilik oranının zamana göre değişimini temsil eden üç doğrusal diferansiyel denklem sistemi ile modellenmiştir. Zaman türevlerine, kesikli Gegenbauer dalgacık serisiyle yaklaşılmış ve diferansiyel denklem sistemi, cebirsel denklem sistemine dönüştürülmüştür. Elde edilen sayısal sonuçlar, literatürde mevcut diğer sayısal sonuçlarla karşılaştırılarak önerilen tekniğin güvenilir ve hızlı olduğu gösterilmiştir. Ayrıca, yöntemin yüksek doğruluk sağladığı ve bu nedenle diğer ekolojik olayların çözümünde de kullanılabileceği ortaya konmuştur.Article Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted From Dam Failure in Urkmez Residential Area by Means of Distorted Physical Model(2021-09-15) Güney, Mehmet Şükrü; Sevinç, EmrahThe purpose of this study is to investigate the effect of partial vegetation on the wave propagationresulted from sudden dam failure in a residential area. Temporal variations of water depths and floodwave propagation velocities were determined and compared with those obtained from theexperiments performed without vegetation. The experiments were performed on the distortedphysical model of Urkmez Dam and its downstream region. The distorted physical model withhorizontal scale of 1/150 and vertical scale of 1/30 contains the dam reservoir, the dam body, theresidential area of Urkmez coastal town until the sea and the partial vegetation. In the model, thereservoir has an active volume of 11.222 m3, the dam body has a length of 2.84 m and a height of 1.07m, and the downstream area is nearly 200 m2. Water depths were measured by e+ WATER L levelsensors placed at various locations of the downstream region. Velocities were measured by ultrasonicvelocity profilers (UVP) located near the level sensors. Flood wave propagation was recorded by thehigh definition digital camera. Experimental findings obtained from the physical model wereconverted to the prototype values, in nature. The changes in water depths and elapsed times, also thechanges in velocities and their occurrence times were determined for different zones of thedownstream area in the presence of vegetation. The experimental results revealed that in such a damfailure, the flood arrives at the sea in 6 s in the absence of vegetation, while in 10 s in the presence ofvegetation. These values correspond to 2.74 min and 4.57 min, respectively in the prototype. Theexistence of vegetation resulted in decrease in flood propagation velocities mainly in the denseresidential area, as expected. It was observed that the maximum water depths were increased at theleft bank and decreased at the right bank, except at level sensor S6 which is very close to the creek. Itwas observed that the maximum depth averaged velocities were decreased in the sparse and denseresidential areas. The existence of the vegetation changed considerably the local velocities duringrising and recession stages of the water depth. It was found that the order of magnitude of theprototype velocities was high and such velocities can cause serious damage mainly in the buildingsclose to the dam body. Because the presence of vegetation caused a decrease in flood propagationvelocities in the sparse and dense residential areas, it would reduce the damages on the buildings inthese areas.Article Is Production or Consumption the Determiner? Sources of Turkey’s Co2 Emissions Between 1990-2015 and Policy Implications(2021-09-29) Alkan, Ayla; Oğuş Binatlı, Ayla; Binatli, Ayla OgusTurkey’s CO2 emissions have been steadily increasing since the 1990s. Determining influences of socioeconomic factors behind thisincrease can help identify which sectors and what types of policies should be prioritized to go into action. This paper identifies themain contributors to CO2 emissions change within five-year intervals during 1990-2015 by adopting the Structural DecompositionAnalysis (SDA) method. The results show that CO2 emissions increase was driven by per capita expenditure and population factors,while emission coefficient factor had a reducing effect on emissions. As the production side factors fell pretty behind theconsumption side factors, net emissions were positive and the actual determiner in CO2 emissions was found as consumption. Themost contributing sectors were Electricity, Land Transportation and Mineral. Speeding up renewable energy investments andcontinuing energy efficiency measures, placing a carbon tax on electricity and oil consumption, promoting public transport and useof clean fuels and vehicles, slowing down construction and raising consumer awareness to change their consumption behavior,particularly to reduce demand for high emitting products and services should be the top priority policies.