A Hydrodynamic Modeling Study to Determine the Optimum Water Intake Location in Lake Paldang, Korea

Abstract

A three‐dimensional hydrodynamic model was applied to Lake Paldang, South Korea. The lake has three inflows, of which Kyoungan Stream has the smallest flow rate and poorest water quality. Since all drinking water intake stations are located near the confluence of Kyoungan Stream within the lake, this contaminated tributary may have a significant impact on the quality of drinking water sources. The optimum drinking water intake location was determined from the applied model. The model was calibrated and verified using the data measured under different hydrological conditions. The model results were in reasonable agreement with the field measurements in both calibration and verification. The circulation and spreading patterns of the incoming flows in the lake, as well as their composition ratios to the drinking water intakes were determined from the model, and three alternative intake locations were proposed. The simulation results suggested that the horizontal and vertical relocations of the intake aqueduct could significantly decrease the composition ratio of the contaminated water. From this study, it was concluded that the three‐dimensional hydrodynamic model could successfully simulate the temporal and spatial mixing patterns of incoming flows and become a useful tool in determining the optimum water intake location in Lake Paldang.

Characterizing Density Flow Regimes of Three Rivers with Different Physicochemical Properties in a Run-Of-The-River Reservoir

“…25 m throughout the year. The errors between the observed and simulated water levels were estimated to be MAE 0.02 m, RMSE 0.03 m, and RE 0.1%, which were relatively small compared to previous studies [27]. The accuracy of the simulated water level confirms the reliability of the numerical grid and flow boundary conditions used in the model.…”

“…Further, the impact of upstream rivers on the flow regimes and water quality of the reservoir is relatively large and rapid [35]. In addition, due to the operating characteristics of the ROR reservoir and the geographic structure resulting from rapidly increasing width and depth near the bends where the two main rivers converge, the variability in hydraulic and water quality properties is even greater [27,35,36]. Consequently, spatial distribution characteristics of water quality in Paldang reservoir are closely related to physical mixing characteristics [37][38][39][40][41][42].…”

Contribution of Internal Nutrients Loading on the Water Quality of a Reservoir

“…The GLLVHT model is suitable for representing irregular boundaries because it uses a curvilinear computational grid method. It has been successfully applied to identify the causes of water quality problems in various hydraulic environments and to find solutions [11,[37][38][39][40][41]. The GLLVHT model is built into the Generalized Environmental Modeling System for Surfacewaters (GEMSS) and serves as an integrated system for hydraulics to support a three-dimensional, time-varying modeling system.…”

Influence of Different Substrates in Wetland Soils on Denitrification

“…More than 95% of water flow into the lake comes from the South and North Branches, which have relatively clean water quality. Gyoungan Stream has the smallest flow rate but the worst water quality because the stream is located in a watershed near the metropolitan area that can produce heavy contaminants (Na and Park 2005).…”