1713号台风"天鸽"是53 a来对港、珠、澳地区影响最大的台风。通过对"天鸽"风暴潮的模拟,验证了MIKE21模型和Holland风场构建的天文潮以及二维风暴潮模模型的可靠性,在此基础上探究了珠江河口在不同路径、不同中心...1713号台风"天鸽"是53 a来对港、珠、澳地区影响最大的台风。通过对"天鸽"风暴潮的模拟,验证了MIKE21模型和Holland风场构建的天文潮以及二维风暴潮模模型的可靠性,在此基础上探究了珠江河口在不同路径、不同中心气压以及不同最大风速半径下的风暴潮作用的增水极值。结果表明,不同风暴潮路径对登陆沿岸不同验潮测站的影响不同,其中珠江河口东南角较易受到风暴潮影响且风暴潮的沿岸增水极值较大;当风暴潮中心气压下降10 h Pa时,珠江河口处各测站增水极值增幅大约为2%至3%;最大风速半径减小则对距离风暴潮行进路线较远的地区影响较大。展开更多
建立琼州海峡风暴潮与天文潮耦合数值模型,并通过1409号"威马逊"台风实测数据验证模型的可靠性,随后通过多组数值试验研究琼州海峡风暴潮与台风移动路径、最大风速半径及中心气压的关系。结果表明:台风移动路径与增水分布关...建立琼州海峡风暴潮与天文潮耦合数值模型,并通过1409号"威马逊"台风实测数据验证模型的可靠性,随后通过多组数值试验研究琼州海峡风暴潮与台风移动路径、最大风速半径及中心气压的关系。结果表明:台风移动路径与增水分布关系密切;随着台风最大风速半径的增大,琼州海峡区域风暴增水达到增水极值的时间提前且增水极值增大,但增水极值增加幅度逐渐减小,距离台风中心路径较近区域其增水极值受半径变化的影响相对较小。琼州海峡风暴增水极值随台风中心气压的降低而增大,台风中心气压降低10 h Pa,增水极值增加10%左右。展开更多
Based on gradient wind equations, including frictional force, and considering the effect of the movement of a tropical cyclone on wind speed, the Fujita Formula is improved and further simplified, and the numerical sc...Based on gradient wind equations, including frictional force, and considering the effect of the movement of a tropical cyclone on wind speed, the Fujita Formula is improved and further simplified, and the numerical scheme for calculating the maximum wind speed radius and wind velocity distribution of a moving tropical cyclone is derived. In addition, the effect of frictional force on the internal structure of the tropical cyclone is discussed. By comparison with observational data, this numerical scheme demonstrates great advantages, i.e. it can not only describe the asymmetrical wind speed distribution of a tropical cyclone reasonably, but can also calculate the maximum wind speed in each direction within the typhoon domain much more accurately. Furthermore, the combination of calculated and analyzed wind speed distributions by the scheme is perfectly consistent with observations.展开更多
文摘1713号台风"天鸽"是53 a来对港、珠、澳地区影响最大的台风。通过对"天鸽"风暴潮的模拟,验证了MIKE21模型和Holland风场构建的天文潮以及二维风暴潮模模型的可靠性,在此基础上探究了珠江河口在不同路径、不同中心气压以及不同最大风速半径下的风暴潮作用的增水极值。结果表明,不同风暴潮路径对登陆沿岸不同验潮测站的影响不同,其中珠江河口东南角较易受到风暴潮影响且风暴潮的沿岸增水极值较大;当风暴潮中心气压下降10 h Pa时,珠江河口处各测站增水极值增幅大约为2%至3%;最大风速半径减小则对距离风暴潮行进路线较远的地区影响较大。
文摘建立琼州海峡风暴潮与天文潮耦合数值模型,并通过1409号"威马逊"台风实测数据验证模型的可靠性,随后通过多组数值试验研究琼州海峡风暴潮与台风移动路径、最大风速半径及中心气压的关系。结果表明:台风移动路径与增水分布关系密切;随着台风最大风速半径的增大,琼州海峡区域风暴增水达到增水极值的时间提前且增水极值增大,但增水极值增加幅度逐渐减小,距离台风中心路径较近区域其增水极值受半径变化的影响相对较小。琼州海峡风暴增水极值随台风中心气压的降低而增大,台风中心气压降低10 h Pa,增水极值增加10%左右。
基金supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 40425009 and 40730953
文摘Based on gradient wind equations, including frictional force, and considering the effect of the movement of a tropical cyclone on wind speed, the Fujita Formula is improved and further simplified, and the numerical scheme for calculating the maximum wind speed radius and wind velocity distribution of a moving tropical cyclone is derived. In addition, the effect of frictional force on the internal structure of the tropical cyclone is discussed. By comparison with observational data, this numerical scheme demonstrates great advantages, i.e. it can not only describe the asymmetrical wind speed distribution of a tropical cyclone reasonably, but can also calculate the maximum wind speed in each direction within the typhoon domain much more accurately. Furthermore, the combination of calculated and analyzed wind speed distributions by the scheme is perfectly consistent with observations.
