Contaminants transport and mixing in a deep and stratified reservoir are largely governed by the thermal structure of the reservoir. For last two decades, diverse three-dimensional (3D) hydrodynamic and water quality models have been developed and applied for supporting reservoir management, but validation studies of the models to simulate stratification processes of deep reservoirs using extensive field data were rare. The study was aimed to evaluate the performance of a 3D hydrodynamic model, ELCOM, in a deep and dendritic reservoir located in Geum River of Korea for simulating heat fluxes and stratification processes. The model showed satisfactory performance in simulating the water temperature profiles within the acceptable errors at all monitoring stations. The evaporative and sensible heat losses through the reservoir surface were maximized during August and January, respectively. The net heat flux (H_n) was positive from February to September, while the stratification formed from May and continued until September. The model reasonably reproduced instant surface vertical mixings that observed during strong wind events. ELCOM is recommendable as a suitable 3D hydrodynamic model for supporting water quality management of the deep and stratified reservoirs.
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