| 摘要: |
| 双消浪室局部开孔沉箱防波堤具有低反射、结构受力小、适宜较大水深和工程造价低等优点。为明确双消浪室局部开孔沉箱水动力特性的主要影响因素,采用理论分析和物理模型试验相结合的方法,对规则波和不规则波作用下双消浪室局部开孔沉箱防波堤的反射特性进行研究。基于势流理论,建立规则波和不规则波对局部开孔沉箱防波堤作用的三维解析解,采用二次压力损失边界条件考虑沉箱开孔墙对波浪运动的影响,利用周期性边界条件考虑防波堤结构沿长度方向的周期性变化。开展相应规则波和不规则波物理模型试验,验证理论模型的合理性。通过算例分析,研究不同波浪要素和结构参数对防波堤反射特性的影响。研究表明:双消浪室局部开孔沉箱相对消浪室宽度取值为0.08~0.20,沉箱前墙开孔率大于后墙开孔率时,防波堤在较大波浪频率范围内消波效果显著;当前后墙的开孔率相等时,防波堤反射系数的最小值随着开孔率增大而减小。 |
| 关键词: 双消浪室 局部开孔沉箱 二次压力损失 解析解 物理模型试验 反射系数 |
| DOI：10.11693/hyhz20211200321 |
| 分类号:TV3;TV92 |
| 基金项目:国家自然科学基金基础科学中心项目,52088102号;国家自然科学基金青年科学基金项目,52101336号。 |
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| ANALYTICAL AND EXPERIMENTAL STUDIES ON THE REFLECTION CHARACTERISTICS OF PARTIALLY PERFORATED CAISSON BREAKWATER WITH DOUBLE WAVE CHAMBERS |
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WANG Xin-Yu1, ZHAO Jing2, WANG Hai-Feng2, WANG Lyu-Qing2, LIU Yong1
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1.Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China;2.Unit 91053 of the Chinese People’s Liberation Army, Beijing 100071, China
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| Abstract: |
| The perforated caisson breakwater has merits of weaker wave reflection, smaller wave forces, more suitable for deep water and lower engineering cost. By theoretical analyses and physical modeling, the reflection characteristics of partially perforated caisson breakwater with double wave chambers under the action of regular and irregular waves are investigated. Based on linear potential flow theory, a three-dimensional iterative analytical solution was developed for waves acting on partially perforated caisson breakwater with double wave chambers. A quadratic pressure drop condition is adopted to consider the effects of the perforated wall on wave motion. A periodic boundary condition is introduced for considering the periodical variation of structure along the longitudinal direction of the breakwater. The corresponding physical model tests under the action of regular and irregular waves are performed to verify the rationality of the analytical model. The effects of wave and structural parameters on the reflection characteristics of the breakwater are investigated by case studies. The results show that the breakwater can achieve good performance in a wide range of wave frequencies when values of (B1 + B2)/L vary from 0.08 to 0.20 with the porosity of front wall greater than that of the rear wall. When the porosities of front and rear walls are identical, the minimum value of reflection coefficient decreases with the increasing porosities. |
| Key words: double wave chamber partially perforated caisson quadratic pressure drop condition analytical solution physical model tests reflection coefficient |
