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NUMERICAL SIMULATION ON THE wind FIELD structure OF A MOUNTAINOUS AREA BESIDE SOUTH CHINA SEA DURING THE LANDFALL OF TYPHOON MOLAVE

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Journal of Tropical Meteorology 2014年第1期20卷 66-73页

作者：李磊陈柏纬胡非张立杰柳艳香 Shenzhen National Climate Observatory Shenzhen Meteorological Bureau State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Hong Kong Observatory Public Meteorological Service Center Chinese Meteorological Administration

Leveraging the commercial CFD software FLUENT,the fine-scale three-dimensional wind structure over the Paiya Mountains on the Dapeng Peninsula near Shenzhen,a city on the seashore of South China Sea,during the landfall of Typhoon Molave has been simulated and analyzed.Through the study,a conceptual wind structure model for mountainous areas under strong wind condition is established and the following conclusions are obtained as follows:(1)FLUENT can reasonably simulate a three-dimensional wind structure over mountainous areas under strong wind conditions;(2)the kinetic effect of a mountain can intensify wind speed in the windward side of the mountain and the area over the mountain peak;and(3)in the leeward side of the mountain,wind speed is relatively lower with relatively stronger wind shear and turbulence.

关键词： typhoon numerical simulation wind structure Shenzhen mountainous area

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A REVIEW OF THE STORM CHARACTERISTICS OF TYPHOON KALMAEGI (1415) AND RELATED FORECASTING CONSIDER ATIONS IN HONG KONG

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Tropical Cyclone Research and Review 2014年第4期3卷 243-255页

作者： Chun-wing Choy Yee-ting Junella Tam Dick-shum Lau Wai-kin Wong Hong Kong Observatory Hong KongChina

Kalmaegi(1415)required the issuance of Gale or Storm wind Signal No.8 in Hong Kong in 2014,even though it passed by at a distance of 370 km from Hong Kong during its closest approach.Storm surges triggered by Kalmaegi caused backflow of sea water in some low lying areas in both Hong Kong and Macao.This paper reviews the use of observational data in monitoring the cyclone characteristics and studies the synoptic factors leading to its fast movement and extensive circulation.The combined analysis of multi-platform satellite wind retrieval,in-situ surface observations and aircraft reconnaissance data over the northern part of the South China Sea is found to be useful in depicting the cyclone structure.Synoptic analysis suggests that the relatively large size of Kalmaegi may be attributed to monsoon shear pattern during its formation stage and the subsequent strengthening of southwesterlies over the northern part of the South China Sea.A strong subtropical ridge north of Kalmaegi not only provides strong steering and thus its high translational speed,but also leads to extensive gale force wind distribution over its northern semi-circle.The performance of various numerical prediction models in forecasting the movement,intensity change and wind structure of Kalmaegi,as well as the storm surge triggered,is assessed and presented.

关键词： Kalmaegi Hong Kong tropical cyclone forecasting track wind structure

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