矩形双曲余弦型水深港池振荡的数值模拟  

Numerical Simulation of Transverse Oscillations in a Rectangular Port Pool With Hyperbolic-cosine Water Depth

作　　者：席苛梦 马小舟 王岗[3,4] 董国海 XI Ke-meng;MA Xiao-zhou;WANG Gang;DONG Guo-hai(Department of Construction Engineering, Dalian University of Technology , Dalian 116024, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology , Dalian 116024, China;College of Port, Coastal and Offshore Engineering, Hohai University , Nanjing 210098, China;Key Laboratory of Coastal Disaster and Protection, Ministry of Education , Nanjing 210098, China)

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]海岸和近海工程国家重点实验室,辽宁大连116024 [3]河海大学港口海岸与近海工程学院,江苏南京210098 [4]海岸灾害及防护教育部重点实验室,江苏南京210098

出　　处：《海岸工程》2019年第2期124-133,共10页Coastal Engineering

基　　金：国家重点研究发展计划项目——海洋工程动力环境精细化预报与安全保障及评估技术研究(2017YFC1404200)和港湾低频振荡精细化预测与港口安全评估技术(2017YFC1404205);中央高校基本科研业务费资助——深海岛礁水动力及港湾振荡研究(DUT18ZD214)

摘　　要：为了研究由涌浪引发的港口横向振荡,采用完全非线性Boussinesq数值模型FUNWAVE2.0模拟了双曲余弦型水深的矩形港池内(1,1)模态的横向振荡。研究表明,只有在港池底部设置微小横向坡度,才能成功地激发横向震荡;而在横向水深不变的情况下,无法激发明显的横向振荡。通过分析纵向坡度、横向坡度和入射波高对横向振荡的影响,了解了横向坡度的影响:当横向振荡幅值较小时,它与横向幅度保持线性关系;横向振荡的幅值较大时,它受到非线性强度的限制,增长缓慢。在纵向坡度较大,入射波高较小时,横向振荡的幅值经过一定时间的增长,能超过纵向振荡并主导港内的水体运动。所有横向振荡都是非线性作用的结果,而非单纯的由地形变化产生的绕射导致的。In order to study the surge-induced transverse oscillations in port pools, the fully nonlinear Boussinesq numerical model FUNWAVE 2.0 is used to simulate the transverse oscillation of mode in a rectangular port pool with hyperbolic cosine water depth.It is found that only by setting a small transverse slope at the bottom of the port pool can the transverse oscillation be successfully excited, whereas no obvious transverse oscillation can be excited under the condition that the transverse water depth remains unchanged.By analyzing the effects of longitudinal slope, transverse slope and incident wave height on transverse oscillation, the influence of transverse slope is understood.When the amplitude of transverse oscillation is small, it keeps a linear relationship with the transverse amplitude;when the amplitude of transverse oscillation is large, it is limited by the nonlinear intensity and grows slowly;and when the longitudinal slope is large and the incident wave height is small, the amplitude of transverse oscillation can exceed the longitudinal oscillation and dominate the water movement in the harbor after growing for a certain period of time.All the transverse oscillations mentioned above are the results of nonlinear effect, rather than those simply caused by the diffraction that is caused by topographic changes.

关 键 词：港湾振荡 横向振荡 数值实验 非线性作用 

分 类 号：P736.211[天文地球—海洋地质] P642.11[天文地球—海洋科学]