摘要
为推广应用新型弧面胸墙沉箱堤,结合模型试验和数值模拟对比分析了深水工况下弧面胸墙沉箱堤和削角胸墙沉箱堤的反射形态。波面和波压的数值结果与试验数据吻合良好,验证了数值方法的有效性。反射系数表明,入射波浪在与弧面胸墙沉箱堤相互作用过程中的能量损耗最小,其反射强于削角胸墙沉箱堤。波面和流速包络图显示,两种堤型均在堤前形成了部分立波系统,腹点和节点以四分之一波长的距离增量交替出现,胸墙和直立部分产生的反射波存在相位差,导致初始腹点的位置向海侧偏移。弧面胸墙沉箱堤前叠合波的相位差影响最小,腹点包络高度最大,节点包络高度最小,反射效应最明显。两种堤型前中下层水流的周期平均速度均较小且对称,表明底床泥沙不会产生趋势性输移,但迎浪基床上方的环流系统可能引起局部冲刷。相对而言,弧面胸墙沉箱堤前的环流强度最弱,更有利于冲刷防护。
In order to promote the application of the quarter-circular-crest caisson breakwater in engineering,the reflective behaviors of the quarter-circular-crest and chamfered-crest caisson breakwaters in deep water were discussed based on model tests and numerical simulations.The numerical model was verified by good agreement between simulated and experimental results for both wave profile and dynamic pressure.The reflection coefficients indicate that the loss of wave energy is smaller during the interaction of incident waves with the quarter-circular-crest caisson breakwater.As a result,the reflection by the quarter-circular-crest caisson breakwater is stronger than that by the chamfered-crest caisson.The surface and velocity envelopes show that a partially standing system is formed in front of both quarter-circular-crest and chamfered-crest caisson breakwaters.Nodes and anti-nodes alternate in a distance increment of a quarter wavelength.The position of the initial anti-node offsets to the weather side due to the phase difference between the reflected waves generated by the curved crest and the upright wall.The effect of the phase difference caused by the quarter-circular-crest caisson breakwater on the composite waves is relatively smaller and hence the stronger reflection can be observed by the greatest and smallest envelope heights at anti-nodes and nodes,respectively.The period-averaged velocity field in front of both quarter-circular-crest and chamfered-crest caisson breakwaters is small and symmetrical,indicating no trend transportation of bottom sediments.However,the circulation system existing above the weather-side rubble mound may cause local erosion.The weakest circulation in front of the quarter-circular-crest breakwater implies more benefits to scour protection.
作者
任丽婷
蒋学炼
赵悦
郄禄文
刘俊涛
REN Liting;JIANG Xuelian;ZHAO Yue;QIE Luwen;LIU Juntao(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjiang University,Tianjin 300384,China;Tianjin Survey and Design Institute for Water Transport Engineering Co.,Ltd.,Tianjin 300456,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Civil Engineering College of Hebei University,Baoding 071002,China)
出处
《海洋工程》
CSCD
北大核心
2023年第2期153-160,共8页
The Ocean Engineering
基金
国家自然科学基金资助项目“海洋立管涡激振动的高倍谐振特性及其影响研究”(51509178)
天津市教委科研计划重点项目“带发电设施的防护建筑物波能捕捉效率提升途径研究”(2019ZD16)
中交第一航务工程局有限公司科技研发项目“沿海城市钢渣与疏浚弃土在水运行业的资源化利用研究”(2020‐7‐5)。
关键词
弧面胸墙沉箱堤
削角胸墙沉箱堤
RANS-VOF模型
反射形态
周期平均速度场
quarter-circular-crest caisson breakwater
chamfered-crest caisson breakwater
RANS-VOF model
reflective behaviors
period-averaged velocity field
