Plateau Meteorology

Plateau Meteorology >

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

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

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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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

Cite this article

GU Tingting , LI Xiaoli , LIU Danni , PAN Yaying . Simulation of Highly Resolved Wind Field on a Severe Cold Air Case over Zhoushan Sea-Crossing Bridge[J]. Plateau Meteorology, 2018 , 37(4) : 1074 -1082 . DOI: 10.7522/j.issn.1000-0534.2017.00086

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