Deducing To Joint Return-Periods Of Extreme Wave Heights And Water Level In Typhoon-Affected Areas

In this paper, factors of typhoon are introduced firstly and they are given someanalysis in more than one aspect. Typhoon occurrence frequency, intensity of typhoonand the distance between observing station and typhoon-center are finally determinedas the factors to typhoon-affected sea areas. The correlation among the factors is givenin this paper, and the effects to marine environmental factors are also listed. Thediscrete distribution based on the maximum entropy principle and Poisson distributionare used to analyze the possible rules of typhoon, and the comparisons are considered.In this way, the better distribution can be gotten. Because of the non independencebetween the factors of typhoon, a new model is given to fit these factors in typhoon.Through analysis of observed data in Huanghai sea area, some useful results to thismodel can be obtained.Secondly, relationships between extreme wave heights and extreme water levelare analyzed through observed data. In this section, both of maximum entropy jointdistribution and logistic distribution are considered. And the comparison resultssuggest the former distribution is more appropriate in fitting marine environmentalfactors.Finally, a probability distribution nesting discrete variables and continuousvariables is deduced. And it is used to calculate the joint return levels undertyphoon-affected. Considering more than one typhoon factors and two marineenvironmental factors, this practice in sea area is meaningful to design of breakwater.More results comparison explains that the effect of marine environment in typhoonaffected sea areas is related with not one factor of typhoon. And more factors areconsidered, better results we will obtain.