| The ecological and environmental problems facing Pinqing Lake are becoming increasingly serious. In order to explore the
current situation of Pinqing Lake, this paper studies the hydrodynamic characteristics of Pinqing Lake based on an unstructured numerical
model, and analyzes the water exchange capacity of Pinqing Lake through a coupled transport and diffusion model. The results show: the
tidal current in Pinqing Lake basically presents reciprocating flow, and the velocity at the mouth is larger, while the tidal current in Pinqing
Lake is weaker. The average water exchange half-time in the whole Pinqing Lake is 26.7 days. The water exchange half-time from the
mouth gate to the lake top gradually increases, and the water exchange half-time near the mouth gate is relatively short, which indicates
strong water exchange capacity. The average water exchange half-time in Zone A and Zone B near the mouth gate is 0.4 d and 3.4 d,
respectively. In the area far away from the mouth and shallow water depth, the hydrodynamic conditions become weaker and the water
exchange half-time is longer, which shows poor water exchange capacity. The average water exchange half-time of water in the central area
E, typhoon shelter C and D of Pinqing Lake is 13.0 d, 18.7 d and 19.7 d, respectively, and the maximum water exchange half-time of water
near the lake top is more than 75 d. The results of this study can provide theoretical guidance for the ecological environment management of
Pinqing Lake. |
