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KMID : 1024520140230091537
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Journal of the Environmental Sciences
2014 Volume.23 No. 9 p.1537 ~ p.1549
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Trophic State Index (TSI), Spatial Gradient Characteristics and the Empirical Models for Eutrophication Evaluations in Daecheong Reservoir
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Kwon Hyuk-Hyun
An Kwang-Guk
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Abstract
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The objectives of this study were to analyze reservoir trophic state, based on Trophic State Index (TSI), spatial
variation patterns of three zones (riverine, transition, and lacustrine zone), and empirical models through 20-years
long-term data analysis. Trophic variables of TP and CHL-a were highest during the summer monsoon, and decreased
along the main axis from the riverine to lacustrine zone. In the mean time, TN did not show the trend. Ratios of N:P
and Secchi disc transparency (SD) increased from the riverine to lacustrine zone. The analysis of trophic state index
(TSI) showed that mean TSI (TP) and TSI (CHL-a) were 62 and 57, respectively, and these values were highest in the
transition zone during the summer. This zone should be managed well due to highest lake water pollution. The analysis
of Trophic State Index Deviation (TSID) showed that algal growth was primarily limited by light penetration, and this
was most pronounced in the monsoon season. The analysis of empirical models showed that the value of R2
, based on CHL-SD model, was 0.30 (p < 0.0001) in the transition zone and the R2
, based on TP-SD model, was 0.41 (p < 0.0001) in the transition zone.
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KEYWORD
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Daecheong Reservoir, Water Quality, TSI, Empirical model
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