苏通大桥桥位江面风速的数值试验  

Numerical experiment of the wind velocity over Sutong highway bridge

作　　者：杨正卿[1] 刘聪[2] 银燕[1] 

机构地区：[1]南京信息工程大学大气物理学院,南京210044 [2]江苏省气象台,南京210008

出　　处：《气象科学》2010年第2期193-201,共9页Journal of the Meteorological Sciences

基　　金：国家科技支撑计划项目(2006BAG04B00)

摘　　要：用WRF中尺度模式对苏通大桥桥位江面的风速进行了数值模拟。在修改了模式自带的静态地形数据后模拟效果较修改前有所改善。并发现在对天气系统有较准确模拟的情况下模式对桥位江面最大风速的模拟也较为精确,反之结果相差较多。挑选了其中两个个例并使用修改过静态地形数据的模式分别对地形和一些物理方案作敏感性试验,发现各种因素对模拟结果都有着不同程度的影响,起决定性作用的是水陆分布;在没有强对流天气系统的情况下各种微物理参数化方案对模拟结果均不产生明显影响;模拟时需加入长短波辐射参数化和边界层参数化方案,并且其中YSU边界层参数化方案的模拟结果最为理想。在缺乏江面风观测数据的时段里模式对江面风速的模拟结果具有一定的参考价值。The wind velocity over Sutong highway bridge was simulated using the mesoscale model WRF in this paper. The initial static data used by the model was modified to improve the results of simulation of wind velocity over Sutong highway bridge. While the weather systems were simulated well and truly by the model, the maximum wind velocity over Sutong highway bridge could also be simulated accurately. Two examples were chosen to conduct sensitivity experiments and we have found that it is the water-land distribution that plays a crucial role to form the unique wind velocity distribution in this region. When there is no severe convection weather system, none of the microphysics parameterization processes has obvious effect on the simulation results. Long wave and short wave radiation parameterization and the boundary layer parameterization must be used when simulating the wind velocity, while the YSU boundary layer parameterization was the best for the simulation of the wind velocity over Sutong highway bridge.

关 键 词：风速 公路大桥 敏感性试验 

分 类 号：P425.65[天文地球—大气科学及气象学]