Plateau Meteorology

Plateau Meteorology >

2019 , Vol. 38 >Issue 6: 1272 - 1282

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00019

Idealized Numerical Simulation of Local Mountain-Valley Winds over Complex Topography

  • JIANG Ping ,
  • LIU Xiaoran ,
  • ZHU Haonan ,
  • ZHU Yu ,
  • ZENG Wenxin
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  • Chongqing Climate Center, Chongqing 401147, China;Sun Yat-sen University, Guangzhou 510275, Guangdong, China

Received date: 2018-10-02

  Online published: 2019-12-28

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Abstract

This study used observational data to carry out a high-resolution simulation on mountain-valley winds over complex topography with a computational fluid dynamics model. Results show that the thermal contrast by topography could form the mountain-valley winds. During daytime (T16), the temperature at mountain top increases faster than the foot by the solar radiation, which result in thermal contrast at a same level, and thus forms a clear valley-wind circulation. The near-surface wind is strong at both edges of mountain ridge, and the magnitude can reach 0.15 m·s-1. However, the winds at flat areas of mountain top and valley are not observable. In the evening (T04), the valley keeps warm and mountain top cools by radiation, which forms the mountain wind blowing from the valley. The simulated mountain winds are similar to valley wind, but with a smaller magnitude (~0.1 m·s-1) and an opposite direction. Two sensitive tests show that enlarging the amplitude of the thermal difference between mountain top and valley could enhance valley winds at daytime. The near-surface winds can be as large as 0.4 m·s-1, and the corresponding vertical winds and boundary layer height both increase obviously. However, the mountain-wind circulation do not show similar variations.

Key words： Complex topography; mountain-valley wind; thermal contrast; computational fluid

Cite this article

JIANG Ping , LIU Xiaoran , ZHU Haonan , ZHU Yu , ZENG Wenxin . Idealized Numerical Simulation of Local Mountain-Valley Winds over Complex Topography[J]. Plateau Meteorology, 2019 , 38(6) : 1272 -1282 . DOI: 10.7522/j.issn.1000-0534.2019.00019

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