Evaluation of the water quality at Tahtali dam watershed in Izmir-Turkey by means of statistical methodology

WOS: 000253130200009Sustaining the human ecological benefits of surface water requires carefully planned strategies for reducing the cumulative risks posed by diverse human activities. Municipal governments in Izmir City play a key role in developing solutions to surface water management and protection. Therefore, several methodologies are carried out to develop new solutions for protecting available water resources. In the present study, the major chemical loads of surface water at the Tahtali dam reservoir were evaluated statistically by using monthly averaged values of the measured parameters. Here, the SPSS and NCSS statistical programs were applied during the statistical analyses. Analyses were carried out in two stages. In the first part of the statistical analyses, the mean, median, minimum, maximum, 25th and 75th quartiles were calculated. In second part, the data were investigated by using statistical median test, normality test, parametric and non-parametric correlation and regression analyses. These methods were performed on water quality data taken from four sample sites representing the recharge and discharge areas at the Tahtali dam. The Median test is applied to check if medians of water quality data from four sample sites (Derebogazi, Bulgurca, Menderes and Golcukler) are equal or not. Commonly a non-parametric test (distribution-free test) is used to compare two independent groups of sampled data. Since there are more than two groups in independent group comparison, Kruskal-Wallis test is applied instead of Mann-Whitney U test. Finally, the main objective of using statistical analyses in third research is to estimate the types of pollution sources, the level of pollution and its environmental impacts on the Tahtali dam reservoir by means of statistical methodology

The interference of a deep thermal system with a shallow aquifer and health risk assessment: the case of Sandikli (Afyonkarahisar) Basin, Turkey

WOS: 000371393400054A 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.Scientific and Technical Research Council of Turkey (TUBITAK), Sandikli-Afyonkarahisar, Turkey [CAYDAG-110Y034]This study was financially supported by The Scientific and Technical Research Council of Turkey (TUBITAK) (Project No.: CAYDAG-110Y034-Project title: The study of hydrogeological, hydrogeochemical and isotopic of Hudai geothermal field and its vicinity, Sandikli-Afyonkarahisar, Turkey