高原气象

高原气象 >

2018 , Vol. 37 >Issue 4: 1074 - 1082

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00086

论文

舟山跨海大桥一次强冷空气过程的精细化风场模拟

  • 顾婷婷 ,
  • 李晓丽 ,
  • 刘丹妮 ,
  • 潘娅英
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  • 浙江省气象服务中心, 浙江 杭州 310017;舟山市气象服务中心, 浙江 舟山 316021

收稿日期: 2017-08-12

  网络出版日期: 2018-08-28

基金资助

浙江省科技厅公益性技术研究社会发展重点项目（2014C23003）

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Simulation of Highly Resolved Wind Field on a Severe Cold Air Case over Zhoushan Sea-Crossing Bridge

  • GU Tingting ,
  • LI Xiaoli ,
  • LIU Danni ,
  • PAN Yaying
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  • Zhejiang Meteorological Service Center, Hangzhou 310017, Zhejiang, China;Zhoushan Meteorological Service Center, Zhoushan 316021, Zhejiang, China

Received date: 2017-08-12

  Online published: 2018-08-28

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摘要

以NCEP FNL再分析资料作为初始场和边界场，利用TAPM模式对2015年11月24-27日发生在舟山跨海大桥的一次强冷空气大风过程进行水平分辨率300 m×300 m的数值模拟试验，并采用大桥上的道路气象站观测资料进行误差检验，分析此次大风过程中舟山跨海大桥各路段的横风分布特征。结果表明TAPM模式对于此次大风过程的舟山跨海大桥桥面风速、风向以及横风风速都具有较好的模拟能力，且模式对于过程最大风速的模拟一致性较好，但陆地站点风速模拟值存在偏大的现象。此次冷空气大风影响过程中，金塘大桥中段、西堠门大桥东段以及甬舟高速册子岛段东段为强横风的主要影响路段，横风风速大于11 m·s-1，6级以上的强横风影响时间达33 h以上。而桃夭门大桥到舟山路段虽然过程平均风速较高，但横风影响较弱，横风风速仅为2~7 m·s-1。值得注意的是，甬舟高速金塘岛段自东向西的弯道路段以及桃夭门大桥转向册子岛的弯道路段口，会存在横风突然增大的风险，极易对安全行车造成不利影响。

关键词： TAPM; 精细化; 横风; 数值模拟

本文引用格式

顾婷婷 , 李晓丽 , 刘丹妮 , 潘娅英 . 舟山跨海大桥一次强冷空气过程的精细化风场模拟[J]. 高原气象, 2018 , 37(4) : 1074 -1082 . DOI: 10.7522/j.issn.1000-0534.2017.00086

Abstract

Based on the NCEP FNL reanalysis data, the TAPM model was used to simulate the severe cold air case with a high spatial resolution of 300 m×300 m over Zhoushan sea-crossing bridge from 24 to 27 November 2015.The results of simulation were verified with the observational data from traffic meteorological observation stations on the bridge.Thus, the temporal and spatial distribution characteristics of cross wind at different sections of Zhoushan sea-crossing bridge were analyzed.The results show that TAPM model has a good performance in simulating the evolution and distribution characters of wind fields over the Zhoushan sea-crossing bridge during the severe cold air event.The variation trends of wind speed, wind direction and cross wind speed in every hour are near to the observations, as well as the wind speed and the time when the maximum wind happens.However, the model underestimates the wind speed at the land station.During the process of this severe cold air, the strong cross wind mainly influences the middle section of Jintang bridge, the east section of Xihoumen bridge and Cezi isle, where the cross wind speed is higher than 11 m·s-1.The duration time of the strong cross wind force scale over 6 is more than 33 hours.Although the mean wind speed from Taoyaomen bridge to Zhoushan sections is high, the cross wind speed is much smaller and only about 2~7 m·s-1, the negative impact of the high cross wind is the least compared with other sections.What should be paid attention to is that the risk of cross wind will suddenly increase in the two curve road sections in the east-west direction of Jintang isle of the Yongzhou highway and the ramp between the Taoyaomen bridge and the Cezi isle, which may bring potential traffic hazard and requires additional driving attention.The research provides an effective and feasible way to improve the forecasting and warning of highly resolved wind field and provide better management for the Zhoushan sea-crossing bridge traffic safety.

Key words： TAPM; highly resolved; cross wind; numerical simulation

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