Application of a 2-dimensional water quality model (CE-QUAL-W2) to the turbidity interflow in a deep reservoir (Lake Soyang, Korea)

초록

The temporal and spatial distribution of water temperature was surveyed and simulated in a deep warm monomictic reservoir (Lake Soyang, Korea). The great depth (maximum depth 118 m) and wind-sheltered dendritic shape caused stable thermal stratification in summer. Turbid storm runoff during the summer monsoon formed a 20-40 m intermediate layer distinct from the clearer epilimnion and hypolimnion. The temperature distribution and movements of the density current were simulated by using the 2-dimensional hydrologic model, CE-QUAL-W2. The model was calibrated with data from 1996 and verified with data from 1995-2002 by applying the same set of parameters and constants as used in calibration. The model could simulate temperature profiles with excellent agreement. Movement of the intermediate density current also was well simulated. The CE-QUAL-W2 model was useful in the prediction of temperature distribution and movement of density current in reservoirs, which implies merit for further employment of this model in water quality simulations.

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