波浪非线性对海草消波特性的影响  

Effects of wave nonlinearity on wave attenuation by seagrass

作　　者：何飞[1] 陈杰[1,2,3] 蒋昌波 赵静[1] He Fei;Chen Jie;Jiang Changbo;Zhao Jing(SchooZ of l-IyclrauZic Engineering, Changsha University of Science ＆ Technology , Changsha 410114, China;Key Laborato ry of Water Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;International Re search Center of Water Science ＆ Environmental Engineering, Changsha University of Science ＆ Technology , Changsha 410114 China)

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410114 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114 [3]长沙理工大学水科学与环境工程国际研究中心,湖南长沙410114

出　　处：《海洋学报》2018年第5期24-36,共13页

基　　金：国家自然科学基金重点资助项目(51239001);国家自然科学基金资助项目(51409022);湖南省自然科学基金(2018JJ3546)

摘　　要：海草所形成的植物消波体系能有效防止岸线的侵蚀。利用Sánchez-González等的实验数据分析了波浪非线性对海草消波特性的影响。研究结果表明,相对水深和波陡对海草床的波能衰减系数影响依赖于海草淹没度。相对波高一定时,拖曳力系数随相对水深的增大而增大。对给定的相对水深,拖曳力系数随波陡的增大而减小。波浪非线性对于规则波和非规则波海草消波特性的影响并不一致。用无量纲参数(邱卡数、雷诺数、厄塞尔数)表达拖曳力系数的效果取决于拖曳力系数与无量纲参数的关系中是否充分考虑波浪非线性对拖曳力系数的影响。The shoreline erosion could be efficiently protected by the system of wave attenuation composed of seagrass.The primary objective of the study based on the experiment of Sánchez-González was to investigate the effects of wave nonlinearity on wave dissipation by seagrass.The results showed that the effects of wave steepness and relative water depth on wave damping factor depend on the submergence ratio of seagrass.For a given relative wave height,the drag coefficient increased with an increasing relative water depth.For a given relative water depth,the drag coefficient decreased as wave steepness increased.There were some differences between regular and irregular wave conditions for the effects of wave nonlinearity on wave attenuation.Whether dimensionless parameters,such as Keulegan-Carpenter,Reynolds number,Ursell number,are a better predictor of drag coefficients or not depends on accounting for the effects of wave nonlinearity on drag coefficients.

关 键 词：波浪非线性 海草 波能衰减系数 拖曳力系数 

分 类 号：P731.22[天文地球—海洋科学]