Observation and Analysis on Qiongzhou Strait Gales of Severe Typhoon Neasat (2011)

Wang Zhichun; Zhi Shiqun; Ding Lingyun

Vol.24, NO.5, 2013

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2013 > 24(5): 595-605

Wang Zhichun, Zhi Shiqun, Ding Lingyun. Observation and analysis on Giongzhou Strait gales of severe typhoon Neasat (2011). J Appl Meteor Sci, 2013, 24(5): 595-605.

Citation:

Wang Zhichun, Zhi Shiqun, Ding Lingyun. Observation and analysis on Giongzhou Strait gales of severe typhoon Neasat (2011). J Appl Meteor Sci, 2013, 24(5): 595-605.

Wang Zhichun, Zhi Shiqun, Ding Lingyun. Observation and analysis on Giongzhou Strait gales of severe typhoon Neasat (2011). J Appl Meteor Sci, 2013, 24(5): 595-605.

Citation:

Wang Zhichun, Zhi Shiqun, Ding Lingyun. Observation and analysis on Giongzhou Strait gales of severe typhoon Neasat (2011). J Appl Meteor Sci, 2013, 24(5): 595-605.

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Observation and Analysis on Qiongzhou Strait Gales of Severe Typhoon Neasat (2011)

1.
Guangdong Provincial Climate Center, Guangzhou 510080
2.
School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275

Received Date: 2012-12-10
Rev Recd Date: 2013-06-13
Publish Date: 2013-10-31

Abstract

Abstract

Based on wind data of a severe typhoon observed by two meteorological towers and one motive wind profile radar which are located on both sides of Qiongzhou Strait at the inshore sea, the gale features of the severe typhoon Neasat (2011), maximum wind speed, gust factor and wind profile index variation characteristics of typhoon Neasat (2011) are analyzed.On the right side of the typhoon path, the wind direction is clockwise on the Northern Hemisphere; the maximum 10-minute average wind speed observed in typhoon eye district is near 35 m·s^-1, and the wind direction rotation is over 180°; the maximum 10-minute average wind speed in periphery district is near 30 m·s^-1, and the wind direction around has rotated by 73°. Wind shear process can be fitted by exponential function and logarithmic function, which both fit well for smooth underlying surface, and the logarithmic function is slightly superior to exponential function.Gust factor decreases with increasing wind speed until the wind speed reaches level 6, and rougher underlying surface leads to bigger gust factor.The relation between wind gust factor and the height can be fitted by exponential function, especially when the surface is smooth.Compared with GB/T 18710—2002 recommended value, the gale shear index calculated over rough underlying surface during typhoon Neasat (2011) is higher than the recommended value, while over the smooth underlying surface it is lower than the recommended value.
- severe typhoon Neasat (2011);
- wind shear;
- gust factor;
- Qiongzhou Strait

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References(25)

Figures and Tables

Fig. 1 Severe typhoon Neasat (2011) moving path and observation-point distribution on 29 September 2011

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图 2 2011年9月29—30日不同高度雷达风廓线变化

(a) 水平风廓线时间-高度剖面图，(b) 垂直气流时间-高度剖面图

Fig. 2 Wind profile of different height at radar detected point during 29—30 September 2011

(a) height-time section of horizontal wind profile, (b) height-time section of vertical airflow

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Fig. 3 Wind profile fitting curve at gale

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Fig. 4 100-m height wind conditions at radar detection point during 29—30 September 2011 (a) wind variations, (b) wind vector changes

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Fig. 5 Gradient wind space-time change during the severe typhoon Neasat (2011) transit during 28—30 September 2011

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Fig. 6 100-m height wind conditions at the south tower during 29—31 September 2011 (a) wind variations, (b) wind vector changes

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Fig. 7 Wind profile fitting curve at gale during severe typhoon Neasat (2011) affection

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Fig. 8 Wind power exponent relations with 10-m height wind speed during typhoon Neasat (2011) affection

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Fig. 9 Gust factor with wind speed during severe typhoon Neasat (2011) affection on the south tower

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Fig. 10 Gust factor with wind speed during severe typhoon Neasat (2011) affection on the north tower

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Fig. 11 Gust factor changes with height and its fitting curve at gale on the south and the north towers

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Table 1 Main technical parameters of Airda3000Q boundary layer wind profile radar

参数名称	参数	参数名称	低模式参数
雷达波长	0.23256 m	脉冲宽度	0.33 μs
波束宽度	9°	探测高度范围	3450 m以下
波束数	5	噪声系数	2 dB
天线增益	不低于25 dB	高度分辨率	50 m
波束仰角	70°	相干积累次数	216
发射峰值功率	1500 W	FFT点数	64
探测盲区	50 m以下	带宽	3.0 MHz (滤波器)

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