Author(s): Suin Choi; Dongsu Kim; Youngdo Kim; Siwan Ryu
Linked Author(s): Dongsu Kim, YongDo Kim
Keywords: DCP Density Current River Confluence Mixing Behavior Electrical Conductivity
Abstract: This study investigates the mixing behavior and flow characteristics at the confluence of the Nakdong and Kumho Rivers, focusing on the influence of density currents induced by temperature differences. Field measurements using ADCP and water quality sensors comprehensively analyzed spatial and temporal variations in water quality parameters, such as electrical conductivity and temperature, along with flow velocity. The results revealed that high-momentum inflows during rainfall hindered mixing, causing warmer water to sink and form subsurface layers, whereas low-momentum conditions exhibited typical density current patterns with less pronounced velocity effects. Notably, secondary flow patterns, such as Dual Helical Motion, were distinctly observed and utilized as indicators of mixing efficiency. This study provides detailed insights into the interaction between density currents and mixing behavior, contributing valuable data for improving mixing processes and managing water quality at river confluences.
Year: 2025