title: Investigation of temporal trends in hydrochemical quality of surface water in Western Turkey.
abstract: This study comprises application of non-parametric trend analysis (Mann-Kendall test and Sen's Slope estimator techniques) and multidimensional scaling method to water quality data sets. Water samples analyzed (for chloride, nitrate-nitrogen, sodium, sulfate and total dissolved solid parameters) semi-monthly at seven river monitoring stations in Tahtali Basin, Turkey for 6 years were evaluated. The results revealed that agricultural discharges caused spatial differences in terms of water quality in the basin. Moreover, variable concentrations generally decreased or did not change over time. This study showed that, trend detection and data grouping methods help decision makers to judge effectiveness of management programs.
authors.affiliation: Faculty of Engineering, Department of Environmental Engineering, Dokuz Eylul University, Tinaztepe Campus, Buca 35160, Izmir, Turkey. hulya.boyacioglu@deu.edu.tr
authors.forename: Hülya
authors.initials: H
authors.lastname: Boyacioglu
authors.forename: Hayal
authors.initials: H
authors.lastname: Boyacioglu
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry*; D013997:Time Factors; D014421:Turkey; D018505:Waste Management; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical