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Spatial Interpretation of Monsoon Turbid-water Environment in a Reservoir (Yongdam) Discharging Surface Water, Korea  

Shin, Jae-Ki (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO))
Hur, Jin (Department of Earth and Environmental Science, Sejong University)
Lee, Heung-Soo (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO))
Park, Jae-Chung (Andong Dam Office, Korea Water Resources Corporation (KOWACO))
Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.5, 2006 , pp. 933-942 More about this Journal
Abstract
In this study, temperature, turbidity, suspended paniculate matter (SPM) distribution and mineral characteristics were investigated to explain spatial distribution of the turbid-water environment of Yongdam reservoir in July, 2005. Six stations were selected along a longitudinal axis of the reservoir and sampling was conducted in four depths of each station. Water temperature was showed the typical stratified structure by the effects of irradiance and inflow. Content of inorganic matter in suspended particles increased with the concentration of suspended particulate matter (SPM) due to the reduction of ash-free dry matter (AFDM). Turbidity ranged from 0.6 to 95.1 NTU and the maximum turbidity value of each station sharply increased toward downstream from upstream. The high turbidity layers were located at the depth between 12~16 m. Particle size ranged from 0.435 to $482.9{\mu}m$. day and silt-sized particles corresponded 91.9~98.9% and 1.1~8.0% in total numbers of SPM, respectively. Turbidity showed high correlations with clay (r=0.763, p<0.05) and silt content (r=0.870, p<0.05).Inorganic matter content (r=0.960, p<0.01) was more correlated with turbidity than organic matter (r=0.823, p<0.05). Mineral characterization using x-ray diffraction and electron probe microanalyzer demonstrated that the major minerals contained in the SPM were kaolinite, illite, vermiculite and smectite. As results of this study, surface water discharge as well as small size of the SPM were suggested as long-term interfering factors in settling down the turbid water in the reservoir.
Keywords
Monsoon; Particle; Reservoir; Selective withdrawal; Surface water discharge; Turbidity; Turbid-water;
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Times Cited By KSCI : 9  (Citation Analysis)
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