大亚湾海域典型和可能最大台风冲淤数值模拟研究

Numerical Simulation of Scouring and Silting by Typical and Possibly Strongest Typhoon in Daya Bay

基于MIKE 21建立大亚湾海域风暴潮海浪数值模型,利用实测资料对海域的潮位、潮流和悬沙浓度进行了验证,结果显示,模型计算与实测值吻合较好。由此表明,所建模型能正确反映大亚湾海域的潮流泥沙运动特征。在此基础上通过加入典型台风“山竹”与可能最大台风风暴潮,以此研究台风对大亚湾海域的冲淤状况。结果表明,“山竹”台风和可能最大台风风暴潮对大亚湾海域以微淤为主,仅在马鞭洲、芒洲、白沙洲和喜洲附近出现冲刷,最大冲刷为0.3 m左右。

This paper builds a numerical model of storm surge and wave in Daya Bay based on MIKE 21,and verifies the simulation results of tidal level,tidal current and suspended sediment concentration by the measured data.The results show that the calculated values by the model agrees well with the measured values,which indicates that the model can correctly reflect the characteristics of tidal current and sediment movement in Daya Bay.On this basis,through adding the typical typhoon“Mangkhut”and the possibly strongest typhoon,the influence of typhoon on scouring and silting in Daya Bay are studied,and the results indicate that slight silting is the main influence of“Mangkhut”and the possibly strongest typhoon to the Daya Bay,and the scouring occurs only near Mabianzhou,Mangzhou,Baishazhou and Xizhou,with the maximum scouring of about 0.3 m.