Author(s): Chang Hyun Lee; Soo Bin Yoon; Dong Su Kim; Young Do Kim
Linked Author(s): Dongsu Kim, Young C. Kim, YongDo Kim
Keywords: Lake Paldang hydraulic structure mixing behavior three-dimensional analysis water quality/thermal stratification flow dynamics
Abstract: Lake Paldang is an artificial lake formed by the construction of a dam at the confluence of the Namhan River, Bukhan River, and Gyeongan Stream. Located downstream within a large watershed, it has a short retention time and exhibits distinct hydraulic and water quality characteristics across the riverine, transitional, and lacustrine zones. Notably, the Namhan and Bukhan Rivers are regulated rivers with dam systems, resulting in significant hydraulic and water quality fluctuations due to dam operations. Seasonal and flow-dependent stratification patterns, along with internal circulation within Lake Paldang, are influenced by these inflows. As these dynamics vary, baseline data is needed to analyze the density currents driven by temperature differences between the Bukhan and Namhan Rivers and the mixing behavior within Lake Paldang as inflow volumes fluctuate. River-dominated lakes, like Lake Paldang, are structurally vulnerable to pollution, necessitating analyses of diverse water environment issues. Seasonal and flow-dependent differences in water body characteristics give rise to unique water phenomena, requiring interpretation. Therefore, analyzing three-dimensional mixing behavior within Lake Paldang, from the confluence points of the Namhan, Bukhan, and Gyeongan Rivers, is essential due to variations in water quality, temperature, and flow rate among these inflows. This study analyzes water body mixing patterns in Lake Paldang based on cross-sectional and vertical measurements using advanced equipment. The findings indicate that Lake Paldang’s flow characteristics were assessed through various direct-read parameters and hydraulic analyses. The influence of hydraulic structures located upstream of the inflowing rivers also resulted in diverse patterns of flow characteristics and water mixing within the lake, highlighting the complex variations in Lake Paldang’s internal mixing behavior.
Year: 2025