Yazar "Aksever, Fatma" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    Assessment of stream water chemistry and impact of geothermal fluid in the up-Buyuk Menderes Basin, Turkey
    (Springer Heidelberg, 2017) Davraz, Ayşen; Aksever, Fatma; Afşin, Mustafa
    The discharge of geothermal fluid into the natural water environment may lead to serious damages. In this study, the impact of geothermal waste water on surface water has been investigated in the up-Buyuk Menderes River, Turkey. Thermal return water from district heating and from thermal bath in the Sandikli region were the most important source of major solutes and trace elements to the up-Buyuk Menderes River and tributaries. The thermal contribution causes a drastic increase in Na, SO4 ions, EC, and temperature of surface waters. The concentrations of As, Al, B, Fe, Cr, Li, S, P, Pb, U, Mn, and Zn are increasing dramatically downstream of thermal water inputs in the Kufi Creek tributary. In addition to natural thermal water inputs, water quality was impacted by anthropogenic trace and major element inputs from surface waters. The increased of some trace elements (Al, As, B, Cu, Cd, Fe, Mn, P, U) in surface water are related to anthropogenic activities such as agricultural activities, sewage effluents, and stockyards in the study area. Additionally, surface water quality of the up-Buyuk Menderes River and tributaries was evaluated according to standards given by the Environmental Protection Agency of both Turkey and USA. Our study demonstrates the influence of thermal water inputs on water quality of surface waters.
  • Küçük Resim
    Öğe
    Hüdai (Sandıklı-Afyonkarahisar) jeotermal alanı ve çevresinin hidrojeolojik, hidrojeokimyasal ve izotopik incelemesi
    (TÜBİTAK ÇAYDAG, 2013) Afşin, Mustafa; Aksever, Fatma; Davraz, Ayşen; :Demirel, Vatan; Karakaş, Zehra Semra
    Bu çalışmada, Hüdai Jeotermal alanı (HJA)’nın hidrojeolojik, hidrojeokimyasal ve izotopik özellikleri araştırılarak jeotermal sistem tanımlanmış ve sürdürülebilir kullanım için gerekli veri tabanı oluşturulmuş; HJA’daki travertenlerin petrografik ve izotopik özellikleri ile çökelim ortamları incelenmiştir. Elde edilen verilerle HJA’daki jeotermal sistemin kavramsal modeli çizilmiş; sürdürülebilirliğin sağlanması amacıyla jeotermal suların koruma alanları yeniden belirlenmiştir.
  • Küçük Resim
    Öğe
    The interference of a deep thermal system with a shallow aquifer and health risk assessment: the case of Sandikli (Afyonkarahisar) Basin, Turkey
    (Springer, 2016) Davraz, Ayşen; Afşin, Mustafa; Aksever, Fatma; Karakaş, Zehra; Hınıs, M. Ali
    A mixture of geothermal waters having high ionic concentration to cold water aquifers is caused to deterioration at irrigation and drinking water quality. The aim of this study is determine spreading and extending of pollution in cold groundwater with the contribution of geothermal waters in the Sandikli (Afyonkarahisar) basin. Hydrochemical facies of the waters is Ca-Mg-HCO3 and Ca-Mg-HCO3-SO4 in cold waters and Na-Ca-SO4-HCO3 in the geothermal waters, respectively. Ca2+ and HCO3 are dominant ions in cold waters, whereas those in geothermal waters are Na+ and SO42-. Shallow groundwaters have low ionic concentrations, while deep circulation waters have high ionic concentrations. The increases of T, EC, Na+, SO42-, Cl-, B, Al, As, Fe, Mn, Ni, F, U and NO3- parameters were determined in the cold groundwaters as locally due to hydrothermal contribution, waterrock interaction and anthropogenic effects in the Sandikli basin. As a related to groundwater usage, there are two different risks in the basin, human health risk (drinking water usage) and environmental risk (irrigation water usage). From the results of hazard index, it is verified that As is the main contaminant, and toxic human risk can be caused by ingestion of water in the basin.