翟钢军,鲍建宇,马哲,孙家文,赵西增.海堤坡角变化对海啸波传播过程影响数值分析[J].海洋工程,2020,38(1):77~85
海堤坡角变化对海啸波传播过程影响数值分析
Numerical analysis of influence induced by change of seawall slope angle on tsunami wave propagation process
  
DOI:10.16483/j.issn.1005-9865.2020.01.008
中文关键词:  海啸波  海堤坡角  波浪爬高与衰减  SPH法  消波系数  粒子间距  波面分析
英文关键词:tsunami wave  seawall and slope angles  wave run-up and decay  SPH  wave elimination coefficient  particle spacing  wavefront analysis
基金项目:国家自然基金重大项目(51809053);中央高校基本科研业务费专项资金资助
作者单位E-mail
翟钢军 大连理工大学 海岸和近海工程国家重点实验室辽宁 大连 116024
大连理工大学 深海工程研究中心辽宁 大连 116024 
 
鲍建宇 大连理工大学 深海工程研究中心辽宁 大连 116024  
马哲 大连理工大学 海岸和近海工程国家重点实验室辽宁 大连 116024
大连理工大学 深海工程研究中心辽宁 大连 116024 
deep_mzh@dlut.edu.cn 
孙家文 国家海洋环境监测中心 海域管理技术重点实验室辽宁 大连 116023  
赵西增 浙江大学 海洋学院浙江 舟山 316021  
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中文摘要:
      针对近岸海域极端海况的防灾减灾问题,准确模拟追踪海啸波传播过程,再现液面局部射流、崩破波等波面湍动现象。建立SPH数值水槽,边界条件基于固壁粒子法,减少海堤坡角改变对计算域精度的影响,讨论粒子间距设置对模拟精度的影响。模拟7种不同海堤坡角下波浪的爬高与衰减情况,讨论了海堤坡角变化对消波系数的影响。当粒子间距设置为0.002 m时,模型能准确地捕捉海啸波的强非线性现象。随着海堤坡角增大,海啸波峰值爬升率增大,波浪越堤后因崩破波的产生,波能衰减进一步加剧。当坡角较小时,消波系数随坡角的增大提升明显,而后趋于缓慢增长。
英文摘要:
      Aimming at the disaster prevention and alleviation issues of extreme sea conditions, the large tsunami wave propagation is simulated accurately, and the wavefront turbulence phenomenon such as partial jet and collapse wave is reproduced. A SPH numerical model is established with the solid wall particle boundary condition in order to reduce the influence on calculation accuracy. Impact of particle spacing setting on simulation accuracy is also discussed. Four different breakwater slope angles are analyzed under the impact of wave run-up and decay to verify the boundary condition’s applicability. The liquid surface change can be accurately captured when the model’s particle spacing is set to 0.002 m, the strong nonlinear phenomenon is reproduced during the propagation process. With the increase of slope angles, the peak climbing rate of the tsunami wave increases. The spilling breaker phenomenon is caused by the wave overtopping, which further aggravates the wave energy attenuation. When the slope angle is small, the wave-splitting coefficient increases with the raise of the slope angle, then tends to increase slowly.
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