New model for deducing directional extrema based on multivariate extremum statistical theory  

作　　者：王莉萍 刘天娇 韩润雨 

机构地区：[1]Ocean University of China,College of Mathematical Science

出　　处：《Chinese Journal of Oceanology and Limnology》2010年第6期1323-1328,共6页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 40776006);Shanghai Typhoon Research Fund (No.2009ST05)

摘　　要：The parameters of principal and directional extrema in a marine environment are important in marine engineering design, especially for appropriate construction of oceanic platforms and other structures. When designing wave walls and break water structures, the orientation of the breakwater or seawall depends mainly on the direction of the strongest waves. However, the strength of the breakwater and the elevation of the seawall depend on the magnitude of the biggest wave height of the strongest waves. Thus, identification of directional extrema plays an important role in the design of wave factors. When calculating the directional extremum, different materials may require different specific computational methods, yet few theoretical studies have been conducted in this field of research. Based on multivariate extremnm statistical theory, this paper utilizes a discrete random variable to build a joint probability model compounded by a discrete random variable and a multivariate continuous random variable. Furthermore, this paper provides the first investigation on the theories and methodologies to deduce wave directional extrema. The results provide tools for both creating the calculation method of the directional extremum value and providing the rational directional extremum parameters for marine engineering design.The parameters of principal and directional extrema in a marine environment are important in marine engineering design,especially for appropriate construction of oceanic platforms and other structures.When designing wave walls and break water structures,the orientation of the breakwater or seawall depends mainly on the direction of the strongest waves.However,the strength of the breakwater and the elevation of the seawall depend on the magnitude of the biggest wave height of the strongest waves.Thus,identification of directional extrema plays an important role in the design of wave factors.When calculating the directional extremum,different materials may require different specific computational methods,yet few theoretical studies have been conducted in this field of research.Based on multivariate extremum statistical theory,this paper utilizes a discrete random variable to build a joint probability model compounded by a discrete random variable and a multivariate continuous random variable.Furthermore,this paper provides the first investigation on the theories and methodologies to deduce wave directional extrema.The results provide tools for both creating the calculation method of the directional extremum value and providing the rational directional extremum parameters for marine engineering design.

关 键 词：discrete random variable multivariate extreme value directional extreme value statisticaltheory joint probability mode 

分 类 号：P75[天文地球—海洋科学]