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Dynamics of Turbid Water in a Korean Resernvoir with Selective Withdrawal Discharges  

Shin, Jae-Ki (Korea Institute of Water and Environment, Korea Water Resources Corporation(KOWACO))
Jeong, Seon-A (Korea Institute of Water and Environment, Korea Water Resources Corporation(KOWACO))
Choi, Il-Hwan (Korea Institute of Water and Environment, Korea Water Resources Corporation(KOWACO))
Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
Publication Information
Korean Journal of Ecology and Environment / v.37, no.4, 2004 , pp. 423-430 More about this Journal
Abstract
This study intended to understand movements of turbid water in selective with drawal reservoirs before and after summer monsoon. Mean rainfall during November-May was low, compared to that during June-October. The reservoir water was discharged through watergates when previous rainfall and inflow exceeded 50 mm and $80\;m^3s^{-1}$, respectively. Intake towers were generally used except for the period of the high runoff. Average turbidity in gown-reservoir showed a difference of 29.9 NTU between premonsoon and postmonsoon. Diameter of particles of turbid water ranged between 0.435 and $482.9\;{\mu}m$. Fine particles such as clay were much denser than the larger particle. In the whole stations, clay component was relatively higher with a proportion of that in the particle distribution. Particle composition of turbid water showed that clay consisted of 94.4-98.9% and silt made of 1.1-5.6%. Analysis on turbid water movements derived from particle distribution showed a linear increase from the deep layer toward the surface layer in lower area of a reservoir. This was closely related with the hydraulic behavior of the reservoir, and heavily affected by the discharges through selective withdrawal towers and watergates. Turbid water originated from stream sediments in the middle area then resuspended in the down-reservoir causing a movement between the surface and middle layers of the reservoir. Therefore, such phenomenon needs to be understood for reservoir water quality management.
Keywords
selective withdrawal; turbid water; turbidity; particle; reservoir; monsoon;
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