2025 Volume 81 Issue 16 Article ID: 24-16024
The behavior of hypoxia in a shallow lake is strongly influenced by wind conditions. This research conducted a 3D hydrodynamic and water quality simulation in Lake Suwa, Japan, to analyze the impact of wind condition setting on hypoxia based on two cases: (1) uniform wind conditions derived from observations at AMeDAS Suwa observatory and (2) non-uniform wind conditions calculated by an atmospheric model. A comparison between the cases showed that considering the spatial distribution of wind enhances horizontal circulation and thermal stratification in the lake. In the southwestern part of the lake, the velocity in Case 1 tended to be larger than that in Case 2 during strong winds, suggesting that the bottom velocity in Case 1 would be overestimated. Additionally, the non-uniform wind increased the frequency and scale of hypoxia compared to the result under uniform wind conditions throughout the calculation period.The result highlights the importance of detailed representation of the wind field in understanding and predicting the behavior of hypoxia in shallow lakes.
