Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream
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Dosyalar
Tarih
2010
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Big Melen stream is one of the major water resources providing 268 km(3) year (-aEuro parts per thousand 1) of drinking and municipal water for Istanbul. Monthly time series data between 1991 and 2004 for 25 chemical, biological, and physical water properties of Big Melen stream were separated into linear trend, seasonality, and error components using additive decomposition models. Water quality index (WQI) derived from 17 water quality variables were used to compare Aksu upstream and Big Melen downstream water quality. Twenty-six additive decomposition models of water quality time series data including WQI had R (2) values ranging from 88% for log(water temperature) (P a parts per thousand currency signaEuro parts per thousand 0.001) to 3% for log(total dissolved solids) (P a parts per thousand currency signaEuro parts per thousand 0.026). Linear trend models revealed that total hardness, calcium concentration, and log(nitrite concentration) had the highest rate of increase over time. Tukey's multiple comparison pointed to significant decreases in 17 water quality variables including WQI of Big Melen downstream relative to those of Aksu upstream (P a parts per thousand currency signaEuro parts per thousand 0.001). Monitoring changes in water quality on the basis of watersheds through WQI and decomposition analysis of time series data paves the way for an adaptive management process of water resources that can be tailored in response to effectiveness and dynamics of management practices.
Açıklama
Anahtar Kelimeler
Decomposition Analysis, Monitoring, Time Series, Water Quality Index
Kaynak
Environmental Monitoring And Assessment
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
165
Sayı
1-4
