蔡郁,孙大鹏,赵沛泓,吴浩.开孔率对明基床上开孔沉箱波浪反射系数影响的数值研究[J].海洋工程,2018,36(5):30~37
开孔率对明基床上开孔沉箱波浪反射系数影响的数值研究
Numerical investigation of the influence of opening rate on reflection coefficient of perforated caisson with rubble foundation
  
DOI:10.16483/j.issn.1005-9865.2018.05.004
中文关键词:  不规则波  明基床  开孔沉箱  开孔率  反射系数
英文关键词:irregular wave  rubble foundation  perforated caisson  opening rate  reflection coefficient
基金项目:NSFC-山东联合基金(U1706226);国家自然科学基金(51279027)
作者单位E-mail
蔡郁 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 caiyu219@mail.dlut.edu.cn 
孙大鹏 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  
赵沛泓 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  
吴浩 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  
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中文摘要:
      开孔率是开孔沉箱波浪反射系数的重要影响因素,迄今为止关于开孔沉箱的物模试验研究成果(包括《防波堤设计与施工规范》)中,开孔率μ通常以线性关系反映在开孔沉箱波浪反射系数的计算关系式中,适用范围为0.2~0.4。但当μ<0.2或μ>0.4时,开孔率μ对波浪反射系数Kr的影响规律尚需进一步的研究探讨。现借助二维数值波浪水槽,在扩大了的开孔率取值范围内,模拟不规则波与可渗明基床上开孔沉箱的相互作用。结果表明:在0.2≤μ≤0.4的范围内,用线性关系描述开孔率μ对波浪反射系数Kr的影响是合适的;在μ>0.4时,数模值和物模试验拟合的经验关系式的趋势是一致的;在μ<0.2时,开孔沉箱反射系数Kr随开孔率μ的减小而增大,用物模试验拟合的经验关系式及《防波堤设计与施工规范》中计算公式的线性关系来描述开孔率μ对反射系数Kr的影响是不恰当的。研究成果对开孔沉箱消浪机理的深入认识和开孔沉箱结构的优化设计具有重要意义。
英文摘要:
      Opening rate is an important factor of reflection coefficient of perforated caisson. In the results of physical model tests for open caissons so far (including the “Code of design and construction of breakwaters”), the opening rate μ is usually reflected in the linear relationship between the wave reflection coefficients of the caissons, and the applicable range is 0.2~0.4. However, when μ<0.2 or μ>0.4, the influence of opening rate μ on wave reflection coefficient Kr still needs further studies. With the aid of two dimensional numerical wave flume, in the extended range of opening rate, the interaction is simulated between irregular waves and perforated caisson with permeable foundation. The results show that in the range of 0.2 ≤μ≤ 0.4, it is suitable to describe the influence of the opening rate μ on the wave reflection coefficient Kr by a linear relationship. When μ>0.4, the trend of the empirical relationship fitted by the numerical simulation and the physical model test is consistent. When μ<0.2, the reflection coefficient Kr of open caisson increases with the decrease of the opening rate μ, which is described by the empirical relationship fitted by the physical model test and the linear relationship between the formulas in the “Code of design and construction of breakwaters”. The influence of the opening rate μ on the reflection coefficient Kr is not appropriate. The research results are of great significance to the deep understanding of the wave cutting caisson mechanism and the optimal design of the caisson structure.
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