极端风场对郑东新区人工湖水动力特性影响分析

Hydrodynamic characteristics of an artificial lake under extreme wind condition in Zhengdong New District

该文采用数值模拟的方法,研究了龙湖在极端风场下的风生流场和风生浪场,讨论了对龙湖所产生的影响。研究结果表明,当遇极端风况(10级风力,风速27.7 m/s)时,龙湖表层流速大于底层流速,表层流向与风向一致,最大流速为70.90 cm/s–96.12 cm/s;龙湖全水域有风生浪,有效波高随着水深和风区长度的增大而增大,最大值约为0.77 m。较大的流速和波高可能会对龙湖堤岸和周边设施造成破坏,明确了较不利风向、主频、次频风向下需要提前防护的周岸位置;通过计算不同风速下的龙湖有效波高,建议安全风速预警值约为19 m/s(8级风力)。研究对于龙湖的规划建设和建成后的调度运行具有一定的借鉴意义。

Numerical simulation was used to study wind-driven current and wind-driven wave fields under the extreme wind conditions, and the influences on Longhu Lake were discussed in Longhu Lake. The results show that the surface velocity is greater than the bottom velocity, and the direction of the surface current is the same as wind direction. The maximum velocity is range from 70.90 cm/s to 96.12 cm/s, the wave height increases with the water depth and wind fetch length in the whole waters, as well as the maximum wave height is 0.77 m. Lager current velocity and wave height may cause damage to the bank and the surrounding facilities of Longhu Lake. Unfavorable wind direction and the location that should be protected in advance under the dominant and secondary wind were proposed. In addition, the warning value of wind velocity was suggested to be 19 m/s by calculating the maximum wave height for different wind fields. The study could be taken as reference for the construction and dispatching operation for Longhu Lake.