Yazar "Keskin, Tulay Ekemen" seçeneğine göre listele

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    Hydrogeological Features and Environmental Impacts of Geothermal Waters in the Yildiz River Basin (Sivas, Turkey)
    (Wiley, 2015) Keskin, Tulay Ekemen; Kacaroglu, Fikret
    The study area, located in the Yildiz River Basin (Sivas), has eight geothermal waters, which are used for balneotherapy. The aim of this study was to investigate the natural and/or anthropogenic water pollution in terms of drinking and irrigation water in the Sicak, Cermik, Uyuz, Cermigi, and Hamzaseyh, Cermigi geothermal areas. Na+, Cl-, SO4-2, B, Mn, Fe, As, and Se concentrations of the geothermal waters generally exceed the upper limits stated in the Turkish Standards for Water Intended for Human Consumption and World Health Organization regulations. Based on the irrigation water classification by the U.S. Salinity Laboratory Diagram, it is concluded that these waters may have hazardous levels of salinity and sodium when used as irrigation water. Wastewater from these health and tourism centers is discharged into the Yildiz River and to agricultural land. This procedure causes increase in the concentrations of major and minor elements and negatively affects the river water quality.
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    Investigation of Meteorological Drought Characteristics of the Great Man-Made River Region (Libya)
    (Springer International Publishing Ag, 2022) Elhaj, Mustafa Ibrahim Mohamed; Keskin, Tulay Ekemen; Jamali, Ali
    In this study, located in the Great Man-Made River region, meteorological drought analysis were conducted for five monitoring stations in Northern Libya, the Standardized Precipitation Index (SPI) method and the Reconnaissance Drought Index (RDI) method were used to determine meteorological drought using monthly total precipitation data, and using mean monthly temperatures data and total monthly precipitation data, respectively. The drought analysis using DrinC software of the Great Man-Made River region for 1-, 3-, 6-, and 12-months SPI and RDI values were conducted and examined in detail. According to the SPI12 month index values, the driest period was determined by 86% in Tripoli Airport and Nalut station, and the least dry period was determined at Sirt station by 39%, and as a result of the analyzes that were conducted, according to the values of the RDI-12 month index, the longest period was determined drought in Zuara station in the year 2000-2001. It was noted that the year 2000-2001 was one of the driest years of all stations, and the other years with high drought rates were 1981-1982, 1984-1985, and 1992-1993.
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    Investigation of meteorological drought characteristics of the great man-made river region: a case study of drought in Libya
    (Springer, 2022) Elhaj, Mustafa Ibrahim Mohamed; Keskin, Tulay Ekemen; Jamali, Ali
    Drought is a hidden natural hazard that involves complex climatic systems and has significant environmental and social consequences. Due to the current state of catastrophic climatic occurrences, there has been an increased interest in monitoring droughts in recent years. This study conducted meteorological drought analysis for five monitoring stations in the Great Man-Made River region located in Libya. The Standardized Precipitation Index (SPI) and Reconnaissance Drought Index (RDI) methods were used to determine meteorological droughts utilizing monthly total precipitation data, and mean monthly temperatures and monthly total precipitation data, respectively. The drought analysis of the Great Man-Made River region using DrinC software for 1-, 3-, 6-, and 12-month SPI values were researched. According to the SPI-12-month index values, the driest period was determined by 86% in the Tripoli Airport and Nalut station, and the least dry period was determined in the Sirt station by 39%. It was found that the year 2000-2001 was one of the driest years in all studied stations, and the other years with high drought rates were 1981-1982, 1984-1985, and 1992-1993.
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    MINERAL-WATER INTERACTION AND HYDROGEOCHEMISTRY OF GROUNDWATER AROUND BARTIN COAL MINE, TURKEY
    (Parlar Scientific Publications (P S P), 2013) Keskin, Tulay Ekemen
    The present study was conducted in the Bartin region of Turkey, which has active coal mining. Coal veins are generally located between elastic layers, which are overlain by volcanics. Correlation and factor analyses were applied in order to determine the processes controlling the chemical composition of groundwater. The findings show effects on the physicochemical composition of groundwater of coal level and volcanic rocks. Theses results showed a contamination by Al, Fe, Mn, Pb, B and As, of water discharging from coal levels and volcanics. Al, Fe, Mn, Pb (in one spring) concentrations in these waters exceeded Turkish and WHO drinking water standards, and As concentrations were higher than in other waters. Some of these waters are used by surrounding towns for drinking, domestic and irrigation purposes. Springs discharging from the volcanic Yemislicay Formation have Na-HCO3 facies, and waters discharging from other geological formations have Ca-HCO3 facies.
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    Prediction of water pollution sources using artificial neural networks in the study areas of Sivas, Karabuk and Bartin (Turkey)
    (Springer, 2015) Keskin, Tulay Ekemen; Dugenci, Muharrem; Kacaroglu, Fikret
    The determination of the rock types from which the water is recharged/discharged is an essential component of hydrochemical, hydrogeological and water pollution studies. Especially, detection of sources of groundwater contamination is very important in terms of human health and other living organism. This study aims at prediction of water pollution sources using artificial neural networks (ANNs) in Sivas, Karabuk and Bartin areas of Turkey, which have different types of rocks, agricultural activity and mining activity. In this study, a model based on ANNs was developed for forecast to the water discharging from different types of rocks and the water pollution sources in the study areas. Back propagation and Bee Algorithm (BA) were used in ANN training. For achieving the aim of the study, 14 hydrochemical data set were used. The best ANN classification of water discharging from different type of rocks was accomplished with 80 % accuracy using BA. These results indicate that the researches that are similar to this study can provide quite convenience for the assessment of groundwater pollution sources when applied on a large and regional scale.
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    Statistical analysis of water discharging from rocks of different origin: a case study from Turkey
    (Springer, 2016) Keskin, Tulay Ekemen; Kacaroglu, Fikret; Ersoz, Taner; Dugenci, Muharrem
    The present study was conducted in Sivas, Karabuk and Bartin regions of Turkey, which have rocks of different origins, agricultural and mining activities. Correlation, principal components, hierarchical cluster and multidimensional scaling analyses were applied to determine the processes controlling the chemical composition of groundwater. The results show that dissolution-weathering process, agricultural activities, oxidation processes of sulfide minerals, mining activities, coal levels, alteration of volcanics and progressive silicate hydrolysis effects the physicochemical properties of groundwater in the study areas. Principal components and multidimensional scaling analyses provided excellent visual representations of the grouping of the waters. The significant variables in the first factor are SO4, Mn, Fe, Al, and pH. The factor represents the groundwater reached by these elements via the dissolution and oxidation processes of sulfide minerals (especially pyrite). Ca, EC, and HCO3 are generally grouped under the second factor representing the dissolution of carbonate rocks. The third factor represented by Na, CO3, and pH is mostly related to alteration of volcanics, progressive silicate hydrolysis and dissolution, and probably ion exchange between Ca and Na. The fourth factor of NO3 and Cl is strongly influenced by agricultural activity. The measurement, analyses and evaluation results showed that the groundwater contamination is caused by (1) NO3 in waters discharging from clastic rocks in areas where intensive agricultural activities are conducted; (2) Al, Fe, Mn, and SO4 ions in water emerging from volcanics containing Pb-Zn-Cu ore deposits; and (3) Al, Fe, and Mn in water issuing from coal levels and altered volcanics. Some of these waters are used by adjacent towns for drinking, domestic, and irrigation purposes.