Dogal Afetler ve Cevre Dergisi

1-8

Authors: Aslı Sabuncu, Filiz Sunar

Earthquakes are the most destructive natural disasters, causing massive loss of life, infrastructure damages and serious financial losses. Earthquake-induced building damage detection is a very important step after earthquakes since such buildings pose a risk for cities. The recent advances in digital photogrammetry/remote sensing technology and satellite sensor/camera systems have inspired to emerge new and different research areas and applications. With the development of digital camera technology since 1950's, it has become possible to produce orthophotos with high spatial resolution and positional accuracy. These orthophotos are used successfully in the extraction of the details and the thematic classification. Depending on the high spatial image resolutions, the use of object-based approach has gained importance and has become widespread rather than the traditional pixel-based approach in the thematic classification. The town of Erciş in Van province, situated in the eastern part of Turkey, was selected for the study. In this region, an earthquake with moment magnitude (Mw) of 7.2 was occurred at 10:41 UTC (13:41 local time) on October 23th, 2011. In this study, the orthophotos produced from the aerial photographs taken one day after the earthquake by the General Command of Mapping for the purpose of damage detection. In the post-earthquake ortophotos, 2 different types of sites were selected as the study areas. As an initial step, segmentation process was carried out by selecting the most suitable parameters for the classification of both homogenous and heterogeneous areas. In the segmentation phase, the multi-resolution algorithm was utilized. After doing different trials, the most suitable shape factor and compactness values were considered. In the next step, two different classification approaches, namely “supervised” and “unsupervised”, used within the object based image classification were applied and their classification accuracies were compared.

28-38

Authors: Yaşar Kobya, Cafer Mert Yeşilkanat

In this study, it was aimed to make an elemental analysis of the natural spring waters in 7 cities (Artvin, Rize, Trabzon, Giresun, Ordu, Gümüşhane and Bayburt) in the Eastern Black Sea region and to determine the elemental distribution of the entire region using geostatistical analysis with the help of this analysis. In accordance with this purpose, elemental analyses (Na, Al, P, Cl, K, Ca, V, Mn, Fe, Ni, Cu, Zn) were carried out with the help of ICP-OES device for 40 samples of natural spring water in Eastern Black Sea Region. The average chemical analysis values ​​for each element in Eastern Black Sea Region were as 10270, 215, 122, 4749, 1093, 15960, 59, 5, 89, 18, 10 and 90 μg / L, respectively. The results were generally consistent with the permissible limits of World Health Organization and the Ministry of Health of the Republic of Turkish. In addition, a general harmony was observed as a result of the comparison made with similar studies carried out at different points in the world. Using geostatistical analysis, the distribution of each element was determined and mapped in the study area. By means of these distribution maps, an estimated result could also be obtained about the chemical distributions of waters in unsampled locations. Finally, the possible effects of the analyzed elements on human health and which areas being under risk due to excess elements were discussed in this study.

48-55

Authors: Esra Deniz Güner, Emine Su Turan

With the industrialization process, humanity has had to face the problem of global climate change through the intensive use of fossil fuels since the 1870s. This problem is seriously affecting all countries of the world regardless of the level of development. Renewable energy or alternative energy sources have been advocated in recent years, which is the most agreed proposition that has become prominent on the conservation of nature. With global warming, climate change, and scarcity of limited natural resources, the forms of energy and production that do not pollute nature have become one of the priority demands of the states especially since the signing of the Kyoto Protocol. In this study, the issue of global climate change and the importance of disseminating the use of renewable energy resources in respect to managing this problem were revealed.