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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。
In this paper, the wind-induced flow field and wind-induced wave field in Longhu Lake under extreme wind fields are studied by using numerical simulation method. The impact on Longhu Lake is discussed. The results show that the surface flow rate of Longhu is greater than that of the bottom layer in the extreme wind conditions (10 winds and wind speed of 27.7 m / s), and the surface flow direction is consistent with the wind direction. The maximum flow velocity is 70.90 cm / s-96.12 cm / s. There is wind and waves in the water, and the effective wave height increases with the increase of water depth and wind length, with the maximum value of 0.77 m. Larger flow rates and wave heights may cause damage to the Longhu embankment and its surrounding facilities, and clarify the location of the coast that needs earlier protection in adverse wind directions, dominant frequencies and sub-frequency wind directions. By calculating the effective wave height of Longhu at different wind speeds, it is suggested that safety Wind speed warning value is about 19 m / s (8 wind). The research has certain reference significance to the planning and construction of Longhu and the dispatching and running after its completion.