Two-dimensional Numerical Simu Lation Of Wind-induced Flow Field And Water Exchange Capacity In D Ifferent Types Of Lake Bays

The lake is not only an important habitat for humans,animals,and plants to survive but also an important support for the development of the national economy.The lake water environmental problems brought about by urbanization and industrialization have seriously restricted the healthy development of local ecosystems and economic society.In response to the severe situation faced by the lake water environment system,China has adopted a series of countermeasures such as sewage interception and pollution control,natural restoration,and water quality control of rivers and lakes.These water environment control measures have achieved certain results overall.However,for the lake bay area where the human activities in the lake have the greatest impact,the most serious pollution,and the most difficult to repair,there are still difficulties in treating the symptoms and reducing the water quality.Under natural conditions,the wind-driven circulation is the most important form of water flow in the lake.Exploring the wind-flow structure and water exchange capacity of different forms of lake bay is the key to improving the ecological restoration technology of lake bay.The ecological environment and water security,and the relationship between hydrodynamics and ecosystems are of paramount importance.This paper takes lake bay as the research object.The main research contents and innovations are as follows:(1)The shape of the lake bay is quite different.Based on Google Earth,this paper investigates the geographical characteristics of lake bay and screens the important indicators that characterize the geographical characteristics of lake bay,namely area,shape coefficient,and openness.Classification,defining category boundaries,and deriving the formula for conceptualizing a real lake bay as a rectangular lake bay.(2)Using the two-dimensional water quality hydrodynamic model of lake bay,the two-dimensional flow field and tracer concentration field of different types of lakes are simulated,and the average flow rate,water exchange rate of lake bay are used as indicators.The response of lake bay's natural attributes to the exchange capacity of lake bay and lake bay waters was studied.(3)The formation process of the lake bay circulation under different wind directions and the temporal and the average flow velocity and water exchange rate of the lake.