Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi
Yazarlar: Uğur Erdem DOKUZ, Selma YAŞAR KORKANÇ, Mustafa KORKANÇ
Konular:Mühendislik
DOI:10.28948/ngumuh.502263
Anahtar Kelimeler:Alluvium aquifer,Hydrogeochemistry,Groundwater Pollution,Niğde City Centre
Özet: The primary condition of sustainable regional development is to provide sustainable utilization of natural resources by well understanding its potential. The alluvium cover which Niğde city is built on has a heterogeneous structure owing to regional geological factors that form it. The alluvium cover forms a border between Aşıgediği Metamorphics (gneiss, quartzite, and marble) which spreads eastern and southeastern of the study area and Melendiz Volcanics (andesite and pyroclastics) which spreads western and northwestern part of the study area. The region is tectonically under control of Niğde and Tuz Gölü Fault zones. This geological structure causes the very heterogeneous structure of alluvium cover. This structure directly affects the hydrogeological properties of the study area. Under the control of these geological conditions, Niğde city center alluvium aquifer surrounded by and hydrogeologically in interaction with aquifers composed of marbles from east and southeast and andesites from west and northwest. In the concept of this study, chemical (major ion, PO4, NO3 and trace element) analyses conducted with physicochemical (pH, DO, T, EC) measurements and groundwater level measurements. The results are evaluated by hydrogeochemical calculations, diagrams, and spatial distribution maps. Consequently, it is understood that alluvium aquifer of Niğde city center is under natural and anthropogenic effects in point of water quality. According to results, Niğde city center groundwaters have generally Ca-HCO3 water type with concordant to the geological character while gained Ca-Mg- HCO3, Ca-Na-HCO3 and Ca-SO4 type by the enrichment of Mg, Na and SO4 ions in some parts of the study area still concordant to the geological conditions. While the surrounding lithologies are the main reason for this situation, agricultural, industrial and domestic pollutant can be seen in groundwater particularly from borderlines of alluvium. In addition, it is obtained that SO4 rich geothermal waters also affects alluvium aquifer through the southern part of the study area.