期刊文献+
共找到775篇文章
< 1 2 39 >
每页显示 20 50 100
Observation and Numerical Experiments for Drag Coefficient Under Typhoon Wind Forcing 被引量:1
1
作者 CAO Huiqiu ZHOU Liangming +1 位作者 LI Shuiqing WANG Zhifeng 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第1期35-41,共7页
This paper presents a study on drag coefficients under typhoon wind forcing based on observations and numerical experiments. The friction velocity and wind speed are measured at a marine observation platform in the So... This paper presents a study on drag coefficients under typhoon wind forcing based on observations and numerical experiments. The friction velocity and wind speed are measured at a marine observation platform in the South China Sea. Three typhoons: SOULIK(2013), TRAMI(2013) and FITOW(2013) are observed at a buoy station in the northeast sea area of Pingtan Island. A new parameterization is formulated for the wind drag coefficient as a function of wind speed. It is found that the drag coefficient(Cd) increases linearly with the slope of 0.083′10^(-3) for wind speed less than 24 m s^(-1). To investigate the drag coefficient under higher wind conditions, three numerical experiments are implemented for these three typhoons using SWAN wave model. The wind input data are objective reanalysis datasets, which are assimilated with many sources and provided every six hours with the resolution of 0.125?×0.125?. The numerical simulation results show a good agreement with wave observation data under typhoon wind forcing. The results indicate that the drag coefficient levels off with the linear slope of 0.012′10^(-3) for higher wind speeds(less than 34 m s^(-1)) and the new parameterization improvese the simulation accuracy compared with the Wu(1982) default used in SWAN. 展开更多
关键词 drag COEFFICIENT SWAN high wind SPEED typhoon
下载PDF
Analysis of typhoon wind hazard in Shenzhen City by Monte-Carlo Simulation 被引量:2
2
作者 GUO Yunxia HOU Yijun QI Peng 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第6期1994-2013,共20页
As one of the most serious natural disasters,many typhoons affect southeastern China every year.Taking Shenzhen,a coastal city in southeast China as an example,we employed a Monte-Carlo simulation to generate a large ... As one of the most serious natural disasters,many typhoons affect southeastern China every year.Taking Shenzhen,a coastal city in southeast China as an example,we employed a Monte-Carlo simulation to generate a large number of virtual typhoons for wind hazard analysis.By analyzing 67-year historical typhoons data from 1949 to 2015 using the Best Track Dataset for Tropical Cyclones over the Western North Pacific recorded by the Shanghai Typhoon Institute,China Meteorological Administration(CMASTI),typhoon characteristic parameters were extracted and optimal statistical distributions established for the parameters in relation to Shenzhen.We employed the Monte-Carlo method to sample each distribution to generate the characteristic parameters of virtual typhoons.In addition,the Yah Meng(YM)wind field model was introduced,and the sensitivity of the YM model to several parameters discussed.Using the YM wind field model,extreme wind speeds were extracted from the virtual typhoons.The extreme wind speeds for different return periods were predicted and compared with the current structural code to provide improved wind load information for wind-resistant structural design. 展开更多
关键词 typhoon HAZARD ANALYSIS Monte-Carlo simulation wind field model EXTREME wind SPEED
下载PDF
An improved QuikSCAT wind retrieval algorithm and eye locating for typhoon 被引量:1
3
作者 ZHONG Jian FEI Jianfang +2 位作者 HUANG Sixun DU Huadong ZHANG Liang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2012年第1期41-50,共10页
This paper proposes a rain considered geophysical model function (GMF), to be noted as GMF plus Rain. GMF plus Rain is based on the basic raidative transfer model with attenuation and scattering effects of rain on r... This paper proposes a rain considered geophysical model function (GMF), to be noted as GMF plus Rain. GMF plus Rain is based on the basic raidative transfer model with attenuation and scattering effects of rain on radar signal considered. Combined with the NSCAT2 GMF and the rain correction model, the GMF plus Rain model is used to retrieve the ocean wind vectors from the collocated QuikSCAT and SSM/I rain rate data for typhoon Melor. The resulting wind speed estimates of typhoon Melor show improved agreement with the wind fields derived from the best track analysis of Japan Meteorological Agency (JMA). The results imply that compared with the GMF model, the GMF plus Rain model can improve the precision of wind retrieval under the rain condition. Then, a new general algorithm of locating the eye of typhoon through the normalized radar cross section (NRCS) is proposed. The implementation of this algorithm in the ten QuikSCAT observations of typhoon Melor suggests that this algorithm is effective. 展开更多
关键词 SCATTEROMETER radiative transfer model typhoon wind field locating the eye of typhoon
下载PDF
Improving the wind and wave estimation of dual-frequency altimeter JASON1 in Typhoon Shanshan and considering the rain effects 被引量:6
4
作者 YANG Le LIN Mingsen +2 位作者 ZOU Juhong LI Zhenghua PAN Delu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2008年第5期49-62,共14页
Altimetry data have been widely used in various fiehts of oceanography, including the extreme weather events such as tropical cyclones, typhoons, and hurricanes. The performance of JASON1 in Typhoon Shanshan is assess... Altimetry data have been widely used in various fiehts of oceanography, including the extreme weather events such as tropical cyclones, typhoons, and hurricanes. The performance of JASON1 in Typhoon Shanshan is assessed by examining the sensor geophysical data record and illustrates how the measured return waveform, significant wave height, and backscatter are all affected by various factors associated with the typhoon, with details by the rain are illustrated. The correction method to maintain accurate wave height and wind speed measurements in Typhoon Shanshan and the results are presented. Furthermore, the additional results of rain rate and typhoon eye diameter can be retrieved. Because of the lack of in-situ measurements of wind, wave, and rain rate at Typhoon Shanshan, results are compared with the forecasted typhoon data and a good agreement is found. 展开更多
关键词 ALTIMETER WAVEFORM typhoon RAIN high wind speed
下载PDF
NUMERICAL SIMULATION ON THE WIND FIELD STRUCTURE OF A MOUNTAINOUS AREA BESIDE SOUTH CHINA SEA DURING THE LANDFALL OF TYPHOON MOLAVE 被引量:5
5
作者 李磊 陈柏纬 +2 位作者 胡非 张立杰 柳艳香 《Journal of Tropical Meteorology》 SCIE 2014年第1期66-73,共8页
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 landfal... 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. 展开更多
关键词 typhoon numerical simulation wind structure SHENZHEN mountainous area
下载PDF
Diurnal wind and nonlinear interaction between inertial and tidal currents in the South China Sea during the passage of Typhoon Conson 被引量:4
6
作者 LIU Junliang CAI Shuqun WANG Shengan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第5期1-7,共7页
Diurnal wind (DW) and nonlinear interaction between inertial and tidal currents near the Xisha Islands of the South China Sea (SCS) during the passage of Typhoon Conson (2010) are investigated using observationa... Diurnal wind (DW) and nonlinear interaction between inertial and tidal currents near the Xisha Islands of the South China Sea (SCS) during the passage of Typhoon Conson (2010) are investigated using observational data and a damped slab model. It is found that the DWs, which are dominated by clockwise wind components, are prominent at our observational site. The DWs increase after the passage of the typhoon from 1 to about 4 m/s, which may be due to the decrease of the sea surface temperature caused by the passage of the typhoon. Kinetic energy spectra and bicoherence methods reveal nonlinear interactions between the inertial currents and the 2MK3 tidal constituent at our observational site. The slab damped model reproduces the inertial currents successfully induced by the total observed winds, and it is shown that the inertial currents induced by DWs are positively proportional to the DWs speed. Even though the observed inertial currents are distinct, the proportion of inertial currents induced by DWs to those induced by the total observed winds is just 0.7%/4% before/after the passage of typhoon. This shows that the inertial currents induced by the DWs are unimportant near the Xisha Islands during the typhoon season. 展开更多
关键词 diurnal winds typhoon inertial currents nonlinear interaction slab damped models
下载PDF
CORRECTION OF ASYMMETRIC STRENGTHENING OF QUIKSCAT WIND FIELD AND ASSIMILATION APPLICATION IN TYPHOON SIMULATION 被引量:4
7
作者 王亮 陆汉城 +1 位作者 潘晓滨 张云 《Journal of Tropical Meteorology》 SCIE 2009年第1期78-82,共5页
As an approach to the technological problem that the wind data of QuikSCAT scatterometer cannot accurately describe the zone of typhoon-level strong wind speed, some objective factors such as the typhoon moving speed,... As an approach to the technological problem that the wind data of QuikSCAT scatterometer cannot accurately describe the zone of typhoon-level strong wind speed, some objective factors such as the typhoon moving speed, direction and friction are introduced in this study to construct the asymmetric strengthening of the QuikSCAT wind field. Then by adopting a technology of four-dimensional data assimilation, an experiment that includes both the assimilation and forecasting phases is designed to simulate Typhoon Rananim numerically. The results show that with model constraints and adjustment, this technology can incorporate the QuikSCAT wind data to the entire column of the model atmosphere, improve greatly the simulating effects of the whole-column wind, pressure field and the track as well as the simulated typhoon intensity covered by the forecast phase, and work positively for the forecasting of landfall locations. 展开更多
关键词 Numerical simulation typhoon forecast data assimilation QuikSCAT wind field asymmetric bogus model
下载PDF
Near ground wind characteristics during typhoon Meari:Turbulence intensities, gust factors, and peak factors 被引量:1
8
作者 WANG Xu HUANG Peng +1 位作者 YU Xian-feng HUANG Chao 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第10期2421-2430,共10页
Wind data were collected during the 2011 typhoon Meari at heights of 10, 20, 30, and 40 m above the ground using a 40 m high anemometer tower in the coastal area near Shanghai Pudong International Airport. Wind speeds... Wind data were collected during the 2011 typhoon Meari at heights of 10, 20, 30, and 40 m above the ground using a 40 m high anemometer tower in the coastal area near Shanghai Pudong International Airport. Wind speeds and directions, turbulence intensities, gust factors, and peaks were analyzed using the time records of wind speed. The results show that turbulence intensity components in longitudinal, lateral, and vertical directions decrease with mean wind speed, regardless of elevations, and the turbulence intensities are in a linear relationship with mean wind speeds. The ratios of three turbulence intensity components(i.e. Iu, Iv, Iw) at heights of 10, 20 and 40 m were calculated and equal to be 1:0.88:0.50, 1:0.84:0.57, and 1:0.9:0.49, respectively. In addition, the gust factors in three directions exhibit a reduction with increasing mean wind speed. The peak factors at different heights show a similar trend and slightly decrease with mean wind speed; average peak factors for all 10-min data from Typhoon Meari are 2.43, 2.48, and 2.47, respectively. 展开更多
关键词 typhoon Meari wind characteristics TURBULENCE intensity GUST FACTOR peak FACTOR
下载PDF
The research on boundary layer evolution characteristics of Typhoon Usagi based on observations by wind profilers 被引量:3
9
作者 LIAO Fei DENG Hua +1 位作者 GAO Zhiqiu CHAN Pak-wai 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第9期39-44,共6页
Vertically exploring the characteristics of the typhoon boundary layer(TBL) plays an important role in recognizing typhoon structure. The boundary layer radial direction and tangential wind characteristics of Typhoo... Vertically exploring the characteristics of the typhoon boundary layer(TBL) plays an important role in recognizing typhoon structure. The boundary layer radial direction and tangential wind characteristics of Typhoon Usagi based on the observational data of three boundary layer wind profiler stations along the route of Typhoon Usagi(No. 1319) and by combining with sounding data. The results show that:(1) maximum tangential wind appears in the vicinity of the eye area of Usagi, and it basically maintains a height of around 1 800 m when Usagi keeps a strong typhoon level, with the rapidly decreasing strength of Usagi after it lands, the speed of the maximum tangential wind and its vertical range both decrease;(2) the height of the maximum tangential wind is close to that of the inflow layer top of the typhoon, and is greater than that of the boundary layer estimated on the basis of Richardson number or potential temperature gradient, while the height of mixed layer judged on the basis of the signal-to-noise ratio(SNR) or its gradient is usually low;(3) the the boundary layer height can reach higher than2 100 m before Usagi lands. When the typhoon level or above is achieved, the boundary layer height observed by various stations does not change much, basically staying at between 1 200 and 1 600 m. With the decreasing strength of Usagi after its landfall, the boundary layer height rapidly drops. 展开更多
关键词 typhoon boundary layer height wind profiler SOUNDING
下载PDF
Influence of Wind Vector Structure Variation of Typhoon "Catfish" Circulation on Its Pathway Mutation 被引量:1
10
作者 WANG Yuan-chao,LIN Bao-ting Yulin Meteorological Bureau in Guangxi,Yulin 537000,China 《Meteorological and Environmental Research》 CAS 2011年第7期15-18,共4页
[Objective] The research aimed to study the wind vector structure variation of No.1013 strong typhoon 'catfish',and its influence on typhoon pathway mutation.[Method] According to the theory that the asymmetri... [Objective] The research aimed to study the wind vector structure variation of No.1013 strong typhoon 'catfish',and its influence on typhoon pathway mutation.[Method] According to the theory that the asymmetric structure of typhoon vortex had influence on typhoon movement,the center of No.1013 super typhoon 'catfish' was as the coordinate origin,and 850,500 hPa tangential rotation speeds within 300-500 km were decomposed into u and v components.The composite force movement tendency of typhoon was analyzed.The wind vector structure variation of No.1013 strong typhoon 'catfish' and its influence on typhoon pathway mutation were discussed.[Result] At the quick movement stage of No.1013 strong typhoon,the wind vector had obvious asymmetric structure.When the typhoon rotated in situ,the wind vector presented symmetric structure.When ΔU,ΔV and composite wind vector had obvious variations,the composite force of typhoon changed,and the moved direction also would change.The asymmetric structure of wind speed near 300-500 km around 500 and 850 hPa typhoon centers was favorable for tendency of moved pathway.The pointed directions of ΔU,ΔV and composite wind vector could be as the direction of composite force movement of typhoon.[Conclusion] The research provided reference basis for typhoon prevention. 展开更多
关键词 typhoon 'catfish' wind vector structure Pathway mutation Influence analysis China
下载PDF
Analysis of Special Strong Wind and Severe Rainstorm Caused by Typhoon Rammasun in Guangxi, China 被引量:1
11
作者 Xiakun Zhang Jian Chen +2 位作者 Zhenquan Lai Liping Zhai Mo Lin 《Journal of Geoscience and Environment Protection》 2017年第8期235-251,共17页
Based on conventional meteorological observation data, NCEP 1° × 1° reanalysis data, reanalysis data with resolution 0.75° × 0.75° from ECMWF and Doppler weather radar, we analyzed the we... Based on conventional meteorological observation data, NCEP 1° × 1° reanalysis data, reanalysis data with resolution 0.75° × 0.75° from ECMWF and Doppler weather radar, we analyzed the weather conditions and physical characteristics of Super Typhoon Rammasun (1409), which caused special strong wind and severe rainstorm in Guangxi. The results show that: 1) Typhoon Rammasun offshore sudden strengthening in one of the main reasons was that loop pressure ridge superimposed into the westward extension of subtropical high, to making enable rapid strengthening of the subtropical high, so the subtropical high advanced faster than the Rammasun move, Rammasun center of the subtropical high distance reduced and the gradient increased;2) Rammasun northward to south china coast with plenty of vapor following ITCZ, before landing, southwest monsoon and cross-equatorial flow were involved, Rammasun got latent heat of monsoon jet, enabling it to strengthen in offshore;3) Rammasun from the Qiongzhou Strait into the northern Gulf, therefore the Strait of short passages and both sides belong to the low zone, friction consumption smaller, that was the main reason what was able to maintain the strength of the super typhoon, when Rammasun into the Beibu Gulf;4) Diagnostic analysis shows that Rammasun before entering the northern Gulf and into the Beibu Gulf later, vorticity weakened, divergence and vapor flux divergence changed were smaller, meanwhile, vertical ascent speed and latent heat transport both increased, which was important reason of severe rainstorm caused by Rammasun. 展开更多
关键词 typhoon Rammasun Strong wind SEVERE RAINSTORM CAUSE ANALYSIS GUANGXI
下载PDF
A STUDY ON THE APPLICATION OF FY-2E CLOUD DRIFT WIND HEIGHT REASSIGNMENT IN NUMERICAL FORECAST OF TYPHOON CHANTHU(1003) TRACK 被引量:2
12
作者 李昊睿 丁伟钰 +2 位作者 薛纪善 陈子通 高郁东 《Journal of Tropical Meteorology》 SCIE 2015年第1期34-42,共9页
In this paper, we first analyzed cloud drift wind(CDW) data distribution in the vertical direction, and then reassigned the height of every CDW in the research domain in terms of background information, and finally, c... In this paper, we first analyzed cloud drift wind(CDW) data distribution in the vertical direction, and then reassigned the height of every CDW in the research domain in terms of background information, and finally, conducted contrast numerical experiments of assimilating the CDW data before and after reassignment to examine the impacts on the forecast of the track of Typhoon Chanthu(1003) from 00:00(Coordinated Universal Time) 21 July to 00:00 UTC23 July, 2010. The analysis results of the CDW data indicate that the number of CDWs is mainly distributed in the midand upper-troposphere above 500 h Pa, with the maximum number at about 300 h Pa. The height reassigning method mentioned in this work may update the height effectively, and the CDW data are distributed reasonably and no obvious contradiction occurs in the horizontal direction after height reassignment. After assimilating the height-reassigned CDW data, especially the water vapor CDW data, the initial wind field around Typhoon Chanthu(1003) became more reasonable, and then the steering current leading the typhoon to move to the correct location became stronger. As a result, the numerical track predictions are improved. 展开更多
关键词 height reassignment cloud drift wind variational assimilation typhoon track GRAPES
下载PDF
Comparison Study on Wind Input and Whitecapping Dissipation Expressions in Numerical Simulation of Typhoon-Generated Waves 被引量:1
13
作者 葛义军 钟中 +1 位作者 张金善 蒋小平 《China Ocean Engineering》 SCIE EI 2008年第4期635-647,共13页
In order to investigate the effect of wind input and whitecapping dissipation on the simulation of typhoon-waves, three experiments are conducted with the latest version of SWAN (Simulating WAves Nearshore) model. T... In order to investigate the effect of wind input and whitecapping dissipation on the simulation of typhoon-waves, three experiments are conducted with the latest version of SWAN (Simulating WAves Nearshore) model. The three experiments adopt the Komen, Janssens, and Westhuysen expressions for wind input and whitecapping dissipation, respectively. Besides the above-mentioned source tems, other parameterization schemes in these experiments are the same. It shows that the experiment with the Westhuysen expression result in the least simulation errors while that with the Janssens expression has the most. The results from the experiments with Komen and Westhuysen expressions show that the differenees in significant wave height (SWH) have a good correlation with the differences in dissipation energy caused by whiteeapping. This indicates that the whitecapping dissipation source term plays an important role in the resultant differences of the simulated SWH between the two experiments. 展开更多
关键词 wind input whitecapping dissipation SWAN typhoon-generated waves
下载PDF
基于多变量灰色模型的台风强度模拟方法 被引量:1
14
作者 孙建鹏 郑仕豪 +1 位作者 马萧岗 黄文锋 《灾害学》 CSCD 北大核心 2024年第1期17-22,共6页
随着台风全路径模拟技术的不断完善,全海域、大范围的台风危险性分析方法得到发展,然而强度模型的模拟精度不能满足需求。针对台风强度演变受多因素影响、动力关系复杂及强度变化随机性强的特点,基于多变量灰色模型对台风强度模拟方法... 随着台风全路径模拟技术的不断完善,全海域、大范围的台风危险性分析方法得到发展,然而强度模型的模拟精度不能满足需求。针对台风强度演变受多因素影响、动力关系复杂及强度变化随机性强的特点,基于多变量灰色模型对台风强度模拟方法进行研究,并建立起台风多变量灰色强度模型。利用该模型还原了台风“山竹”的强度演变过程,同时对西北太平洋地区整体台风强度进行模拟及检验分析。结果表明:垂直风切变及垂直速度与台风强度的灰色关联度分别为0.771 8、0.745 1,显著高于其他3个环境因素;台风“山竹”强度模拟的后验差比值及小概率误差分别为0.349 1、0.960 8,达到了最高模拟精度;模型模拟所得西北太平洋地区整体的强度变化趋势及分布特征均与地区实际情况保持一致。 展开更多
关键词 极值风速 强度模型 灰色关联度 台风“山竹” 西北太平洋
下载PDF
台风“苏迪罗”行进过程中沿海近地实测风场特性研究
15
作者 张建国 温祖坚 雷鹰 《振动与冲击》 EI CSCD 北大核心 2024年第11期272-278,296,共8页
基于厦门大嶝岛台风观测点阵列布置风速仪的现场实测,选取了1513号台风“苏迪罗”在四个不同时间段的风速风向数据,对台风行进过程中的沿海近地风场特性进行了详细分析,得到了台风中心距离观测点400 km、250 km、150 km和120 km时的沿... 基于厦门大嶝岛台风观测点阵列布置风速仪的现场实测,选取了1513号台风“苏迪罗”在四个不同时间段的风速风向数据,对台风行进过程中的沿海近地风场特性进行了详细分析,得到了台风中心距离观测点400 km、250 km、150 km和120 km时的沿海近地平均风速风向、风剖面、阵风因子、湍流度、湍流积分尺度和功率谱密度函数等参数,研究了各种参数同台风中心距和观测高度之间的关系,结果表明:在台风行进过程中,观测点所测风速的平均风速剖面满足对数律规律,粗糙长度z_0约为4.0 m。阵风因子和湍流度变化较为平缓,二者呈线性变化关系。三个方向上的湍流度比值约为1∶0.8∶0.45,湍流积分尺度离散性大,顺、横风向的功率谱密度函数符合von Karman谱的形式,但竖直方向不符合。该结果对深入了解台风在行进中对固定观测点的影响以及提高沿海工程结构的抗风安全性具有实际意义。 展开更多
关键词 实测 近地风特性 台风中心距 台风行进
下载PDF
基于风雨综合指数的安徽省台风灾害房屋风险评估方法
16
作者 宋阿伟 田红 +6 位作者 王胜 刘前 谢五三 唐为安 戴娟 丁小俊 吴蓉 《暴雨灾害》 2024年第3期363-370,共8页
台风致灾因子具有多重性,相对于其他灾种其风险评估更加复杂。采用安徽省81个国家气象站及1035个区域气象站台风过程逐日降水量、最大风速资料,构建台风风雨综合指数;利用台风风雨综合指数及孕灾环境影响系数,开展台风致灾危险性评估;... 台风致灾因子具有多重性,相对于其他灾种其风险评估更加复杂。采用安徽省81个国家气象站及1035个区域气象站台风过程逐日降水量、最大风速资料,构建台风风雨综合指数;利用台风风雨综合指数及孕灾环境影响系数,开展台风致灾危险性评估;基于自然灾害风险系统理论,综合致灾危险性、承灾体暴露度和脆弱性信息,评估安徽省台风灾害房屋风险。结果表明:影响安徽省台风年均个数为1.9个,持续天数以2~4 d居多;台风降水南部多于北部、山区多于平原。台风致灾高危险区位于皖南山区和大别山区,较高危险区位于江淮之间东部,低危险区位于沿淮淮北大部及江淮之间西北部。台风灾害房屋高及较高风险区主要分布在大别山区、江淮之间东部及皖南山区,这些区域海拔总体较高,台风过境易引发山洪地质灾害,加之房屋脆弱性较高,房屋倒塌及损毁风险高;中等风险区位于沿淮至江淮之间、江南部分地区,呈零星分布;较低和低风险区位于淮河以北中西部、沿江部分地区及城市主城区。利用全省各县区台风造成的房屋倒损数据,从空间一致性及散点相关对区划结果进行验证得到,区划结果与灾损具有高度的空间一致性,二者散点相关通过0.01的显著性水平检验,安徽省台风灾害房屋风险区划结果与实际情况基本吻合。 展开更多
关键词 台风灾害 风险评估 致灾因子 风雨综合指数 承灾体 栅格
下载PDF
STMAS同化风廓线雷达对台风“利奇马”融合实况风场的改进分析
17
作者 梁晓妮 黄亦露 +1 位作者 史珩瑜 任晨平 《科技通报》 2024年第6期1-7,共7页
为分析STMAS(space-time multiscale analysis system)同化风廓线雷达对三维风场的改进效果,本文以GRAPES-MESO、GRAPES-GFS 2种预报场作为背景场,对STMAS系统融合浙江省及周边一定范围的L波段边界层风廓线雷达数据,进行4组对比试验。... 为分析STMAS(space-time multiscale analysis system)同化风廓线雷达对三维风场的改进效果,本文以GRAPES-MESO、GRAPES-GFS 2种预报场作为背景场,对STMAS系统融合浙江省及周边一定范围的L波段边界层风廓线雷达数据,进行4组对比试验。通过试验结果与探空雷达实况数据和EC(european meteorological center)再分析资料的对比分析发现:(1)STMAS中融合越多的风廓线雷达信息,融合后的结果改变越明显;(2)从本文试验时段内各时次各层次试验数据与探空雷达差异的平均值来看,以GRAPES-GFS为背景场的融合效果相对较好;(3)通过与探空雷达对垂直风速的对比发现,接入风廓线雷达的STMAS风速场比未接入的STMAS风速更接近实况值,同时STMAS风速场比EC再分析资料更接近探空实况。 展开更多
关键词 STMAS 风廓线雷达 探空雷达 台风“利奇马”
下载PDF
沿海地区良态风和台风气候不同时距风速转换系数研究
18
作者 黄东梅 郑焙元 +3 位作者 杨曙光 苏华海 周建军 陈雨豪 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第7期2612-2624,共13页
以华南地区某海岸机场区域2012—2021年的风速实测数据为对象,根据这10 a内台风的登陆情况,将其划分为良态风气候和台风气候,研究不同风气候环境下风速时距转换系数的变化规律。研究结果表明:在良态风气候下,月、季、年极值风速的分布... 以华南地区某海岸机场区域2012—2021年的风速实测数据为对象,根据这10 a内台风的登陆情况,将其划分为良态风气候和台风气候,研究不同风气候环境下风速时距转换系数的变化规律。研究结果表明:在良态风气候下,月、季、年极值风速的分布规律均符合极值Ⅰ型(Gumbel分布),统计发现转换系数随时距增大呈指数递减的变化规律,基于此拟合得到良态风气候下月、季、年极值风速的时距转换系数公式;在台风气候下,时距转换系数曲线的平稳程度随台风强度的减小而减弱;时距3 s与10 min的转换系数的分布规律符合极值Ⅰ型分布,30 min、1 h与10 min的转换系数的分布规律符合极值Ⅲ型分布;使用良态风转换系数公式估计台风气候时距3 s与10 min的转换系数时,会存在10%~30%的相对误差,可将转换系数乘以对应的放大系数去近似估计,或直接采用1.63的转换系数。该研究结果可为不同风气候条件的风荷载计算提供参考。 展开更多
关键词 时距 极值风速 风速转换系数 良态风气候 台风气候
下载PDF
我国沿海混合强风区典型桥址设计风速取值研究
19
作者 吴思哲 方根深 +3 位作者 潘放 胡小浓 赵林 葛耀君 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期599-607,共9页
为解决我国沿海典型强/台风混合风气候地区仅依赖实测样本难以准确估计不同风气候极值风速的问题,提出同时考虑台风与非台风的极值风速估计方法.对于非台风气候,利用最优概率密度分布拟合年极值风速样本,并考虑因有限样本和概率模型选... 为解决我国沿海典型强/台风混合风气候地区仅依赖实测样本难以准确估计不同风气候极值风速的问题,提出同时考虑台风与非台风的极值风速估计方法.对于非台风气候,利用最优概率密度分布拟合年极值风速样本,并考虑因有限样本和概率模型选择产生的不确定性,获取非台风极值风速区间,其中广义极值(GEV)分布与皮尔逊Ⅲ型(P3)分布估计不确定性约为3~8 m/s.对于台风气候,采用随机路径数值模拟方法,结合三维台风风场模型直接估计10 m高度、基准高度处的极值风速.由此将非台风和台风作为独立事件,采用两者极值风速曲线外包络作为推荐的极值风速设计曲线,并与现行规范进行比较.结果表明,以区间作为取值依据,可保证规范风速普遍低于上包络风速2~5 m/s,临近区间均值,落于区间内,提供了更全面的风速取值方法. 展开更多
关键词 混合强风 台风 非台风 极值风速 不确定性 随机模拟
下载PDF
台风右侧暖涡对台风“鲇鱼”的响应
20
作者 李晟 宣基亮 黄大吉 《海洋学研究》 CSCD 北大核心 2024年第2期1-14,共14页
基于多源观测数据,分析了台风右侧暖涡对2010年南海台风“鲇鱼”的响应,发现了意料之外的暖涡增强和海水下沉现象。台风“鲇鱼”过境期间,暖涡海面高度距平(SLA)最大值从30 cm增加至36 cm、半径从78 km增大至116 km、涡动能从166 m^(2)s... 基于多源观测数据,分析了台风右侧暖涡对2010年南海台风“鲇鱼”的响应,发现了意料之外的暖涡增强和海水下沉现象。台风“鲇鱼”过境期间,暖涡海面高度距平(SLA)最大值从30 cm增加至36 cm、半径从78 km增大至116 km、涡动能从166 m^(2)s^(2)增加至303 m^(2)s^(2)、振幅从3 cm增大至9 cm,台风右侧暖涡边缘的Argo站位处温跃层海水下沉20~40 m。为此,诊断分析了台风风应力旋度对暖涡的单独作用,结果显示暖涡及暖涡边缘的Argo站位处总体受正风应力旋度作用,正风应力旋度将使暖涡减弱、温跃层抬升,与观测到的暖涡增强和海水下沉结果不符。而基于实际海面流场的诊断分析表明,台风“鲇鱼”过境期间台风路径下方的海水辐散,路径右侧暖涡区域海水辐聚,暖涡SLA最大值、涡旋振幅均与辐聚强度呈正相关,Argo站位处海水下沉29 m,都与观测结果相符。个例分析研究表明,位于台风路径外围的中尺度涡对台风的响应不仅受风应力旋度的作用,还受海洋背景环境条件的调制,存在着需要深入研究的过程和机制。 展开更多
关键词 台风 暖涡 增强 风应力 辐聚
下载PDF
上一页 1 2 39 下一页 到第
使用帮助 返回顶部