Study on the climbing height of double solitary waves along an oblique embankment around Shantou city  

双孤立波在汕头附近海岸斜坡爬高研究

作　　者：WANG Yang HUANG Cheng YI Jiaji FENG Kecong XIA Xiaoyu 王洋;黄诚;义家吉;冯科聪;夏效禹(海洋海口地质调查中心中国地质调查局,海口570100;中国地质大学(武汉)海洋地质资源湖北省重点实验室,武汉430074)

机构地区：[1]Haikou Marine Geological Survey Center,China Geological Survey,Haikou 570100,Hainan province,China [2]Hubei Key Laboratory of Marine Geological Resources,China University of Geosciences,Wuhan 430074,Hubei province,China

出　　处：《Marine Science Bulletin》2020年第2期11-22,共12页海洋通报（英文版）

基　　金：supported by Comprehensive Geological Survey of Chaoshan Coastal Zone (No. DD20208013)

摘　　要：Tsunamis have a severe impact on marine coastal structures.Tsunami is generally simplified as solitary wave as they propagate,and the presence of the aftermath of Tsunami is similar to a second solitary wave.Waveform evolution occurs as solitary wave propagate down a gentle slope.This paper reveals the propagation of double solitary waves and slope climbing by numerical simulation where the prototype of the embankment is around Shantou city in the Guangdong Province,China.It not only enriches the theory of solitary wave,but also has important implications for the analysis of tsunami disaster mechanism and the hydrodynamic load characteristics of structures.Based on the average Navier-Stokes equation and the VOF approach,numerical simulation results are given,including changes in the velocity field of the climbing and falling process species.The results show that the double solitary waves produce a strong reflux effect,which results in the second solitary wave climbing significantly less than the height of the first solitary wave without the influence of the current.At the same time,double solitary waves can have a much stronger effect on the embankment.海啸对海洋海岸环境影响严重。海啸在传播时通常被简化为孤立波,海啸余波的出现类似于第二次孤立波。当孤立波沿海岸缓坡传播时,波形发生演化。本文以广东省汕头市附近海岸斜坡为原型,通过数值模拟揭示了双孤立波的传播和爬坡现象。该研究不仅丰富了孤立波理论,而且对海啸灾害机理和结构水动力荷载特性的分析具有重要意义。基于平均纳维尔-斯托克斯方程和VOF方法,给出了数值模拟结果,包括爬升和下降过程速度场的变化。结果表明,双孤波产生了很强的回流效应,使得在不受海流影响的情况下,第二个孤立波的爬升高度明显小于第一个孤立波的爬升高度。同时,双孤波对堤岸的影响作用明显比单一孤立波严重。

关 键 词：double solitary waves EMBANKMENT run-up height hydrodynamic characteristics 

分 类 号：P731.2[天文地球—海洋科学]