Intensity Estimation of Extreme Meteorological and Hydrological Factors Induced by Tropical Cyclones Affecting Hong Kong
Tóm tắt
Hong Kong is often affected by tropical cyclones. The Hong Kong observatory issues warning signals based on the impact of tropical cyclones on the region. The joint frequency analysis of tropical cyclones in Hong Kong can provide a scientific basis for disaster reduction and prevention and post-disaster reconstruction of tropical cyclones. First, the maximum hourly mean wind speed (W), warning signal duration (D), maximum sea level (L), and total rainfall (R) of each tropical cyclone that affected Hong Kong from 1985 to 2019 are selected and fitted using the Gumbel, Weibull, Pearson type 3, and lognormal distributions. Then, bivariate copula functions, such as the Clayton, Frank, Gumbel-Hougaard, and Gaussian copulas, are applied to construct the joint probability models of W, D, L, and R, respectively. The joint return periods of W and D and those of L and R are defined as the meteorological and hydrological intensities of tropical cyclones, respectively. The results show that the joint return periods are good indicators of the comprehensive effect of the meteorological and hydrological intensities of tropical cyclones. No necessary correlation between meteorological and hydrological intensities of tropical cyclones exists. The meteorological and hydrological intensities of tropical cyclones show an upward trend in recent years.
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