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Trend analysis of River water quality: A case study on Gadar-Chai River | ||
| Journal of Applied Research in Water and Wastewater | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 30 دی 1404 اصل مقاله (1.69 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22126/arww.2026.11727.1355 | ||
| نویسندگان | ||
| Neda Jafari* ؛ Yagob Dinpashoh؛ Ahmad Fakheri-Fard | ||
| Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran. | ||
| چکیده | ||
| Water quality in rivers is a critical concern in hydrology. This study examines the Gadar-Chai River, situated within Iran's Urmia Lake basin, utilizing data from four selected hydrometric stations: Oshnavieh, Polebahramlu, Bighaleh, and Naghadeh. An improved Water Quality Index (ImpWQI) was calculated for each station using data from 2003 to 2021. Trends in ImpWQI values and the used water quality parameters, including the annual time series of TDS, EC, pH, HCO₃⁻, Cl⁻, SO₄²⁻, Ca²⁺, Mg²⁺, Na⁺, K⁺, and TH, were analyzed in the period 2003–2021. Three significance levels, at 1%, 5%, and 10%, were used. The Mann-Kendall (MK), Mod-ified Mann-Kendall (MMK), and innovative trend analysis (ITA) methods, as well as Sen's slope estimator, were used for trend detection and calculating the slope of trend lines. The results showed both upward and downward trends in the time se-ries. MK, MMK, and ITA showed similar results in detecting the trend direction, but differed in estimating trend magnitude. MMK tended to show stronger trends than MK .However, unlike the MK and MMK methods, which only identify monotonic trends, the ITA method is capable of detecting sub-trends. Among all the water quality variables of the Gadar-Chai Basin, the pH parameter had the highest num-ber of positive trends. Trends in the Cl- parameter were negative in almost all the stations. Trends in the ImpWQI index were negative in the three stations, namely Oshnavieh, Polebahramlu, and Naghadeh; however, station Bighale witnessed an upward trend in ImpWQI. A negative trend line slope was observed for the EC pa-rameter in the station Polebahramlou, whereas a positive slope was obtained for the same parameter in the station Bighaleh. | ||
| کلیدواژهها | ||
| ImpWQI؛ ITA؛ Mann-Kendall method؛ Sen' s slope estimator؛ Surface water quality | ||
| مراجع | ||
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