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Water Quality Trend Analysis based on Watershed Characteristics in Agriculture Reservoirs  

Kim, Ho-Sub (Han River Environment Research Laboratory, National Institute of Environmental Research)
Choi, Eun-Mi (Department of Environmental Science, Kangwon National University)
Kim, Dong-Woo (Watershed Management Research Division, Environmental Research Complex)
Kong, Dong-Soo (Han River Environment Research Laboratory, National Institute of Environmental Research)
Kim, Kyung-Man (Korea Rural Community & Agriculture Corporation)
Kim, Bom-Chul (Department of Environmental Science, Kangwon National University)
Publication Information
Korean Journal of Ecology and Environment / v.40, no.2, 2007 , pp. 214-222 More about this Journal
Abstract
This study was conducted to assay the relationship between the characteristics of watershed and water quality, and to evaluate water quality characteristics of the classified types by TSI deviation analysis with the collected data from 490 reservoir. Relatively shallow depth (<5m) reservoirs out of selected 490 appeared to be eutrophic. The mean TP concentration in reservoirs with the PFA+UFA/watershed area of above 30% was ${\geq}0.1$ mg $L^{-1}$. The mean TN concentration in reservoirs with the PFA/watershed area of above 25% was ${\geq}2.6$ mg $L^{-1}$. Based on the TSI deviation analysis, water quality parameters in TYPE III reservoirs were in high concentration compared to other reservoirs types. Characteristics of Type III generally showed eutrophic, small DA/RA ratio, shallow depth, and large paddy field and upland field to watershed ratio compared to other types of reservoirs. Both water quality and morpho-physical parameters, Type I and II reservoirs were similar with the exceptions of BOD and chi. ${\alpha}$ concentration. Phosphorus in Type I reservoirs was not the primary limiting factor on algal growth, but significant decrease chl. ${\alpha}$ concentration with the increasing TN/TP indicated that phosphorus was the possible secondary limiting factor. Overall results indicated that type of land use, such as PFA and UFA area in watershed, was important parameters for the assessment of water quality characteristics, and phosphorus was limiting nutrient on algal growth in 490 reservoirs.
Keywords
TSI deviation analysis; morpho-physical parameters; land us; PFA+UFA/watershed area; primary limiting factor;
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Times Cited By KSCI : 3  (Citation Analysis)
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