ANALYTICAL RESEARCH ON THE WAVE DIFFRACTION OF ARC-SHAPED FLOATING BREAKWATERS

1. INTRODUCTIONBreakwaters are generally constructed for thedissipation and reflection of incident wave energyin order to decrease the wave height to protect thecoast against the erosion and to decrease the forceacting on the coastal structures . Compared…     

防波堤损坏特点与其成因的关系

防波堤作为港口的重要保护设施，根据港口特点的不同具有结构多样性。由于防波堤主要结构类型及应用特点不尽相同，因此防波堤损坏问题也成为防波堤质量控制首要解决的问题。本文主要针对防波堤损坏特点，深入探究损坏及其成因的内在关联。     

局部开口防波堤斜向波反射的理论分析与实验研究

研究了局部开口防波堤对斜向入射波的反射特性。整个流域被分成两个子域，在每个子区域内，应用分离变量法和特征函数展开法以求得相应的速度势。在速度势的特征展开中考虑了非传播模态波。数值计算结果与实验数据进行了比较。讨论了开孔影响系数，相对消浪室宽度，消浪室内部的相对水深以及结构物前水深等主要因素对反射系数的影响。     

Dual boundary element analysis of oblique incident wave passing a thin submerged breakwater

In this paper, the dual integral formulation for the modified Helmholtz equation in solving the propagation of oblique incident wave passing a thin barrier (a degenerate boundary) is derived. All the improper integrals for the kernel functions in the dual integral equations are reformulated into regular integrals by integrating by parts and are calculated by means of the Gaussian quadrature rule. The jump properties for the single layer potential, double layer potential and their directional derivatives are examined and the potential distributions are shown. To demonstrate the validity of the present formulation, the transmission and reflection coefficients of oblique incident wave passing a thin rigid barrier are determined by the developed dual boundary element method program. Also, the results are obtained for the cases of wave scattering by a rigid barrier with a finite or zero thickness in a constant water depth and compared with those of experiment and analytical solution using eigenfunction expansion method. Good agreement is observed.     

爆炸处理地基方法在渔港防波堤工程中的应用

文章介绍爆炸处理地基的实例，包括堤端推进爆填、边坡拓宽爆填、加抛密实爆夯、边坡整理爆夯的方法及效果。     

半圆型堤体在电厂导堤和防波堤中应用可行性研究

半圆型防波堤是一种较为新型的防波堤,由于堤体结构特点同其他防波堤相比有诸多优点;本文结合电厂导堤和防波堤的功能,分析半圆型堤体的受力特性及优点,为半圆型堤体在电厂水工建筑物中应用提供科学依据。     

柔性浮式防波堤消浪特性研究

针对圆柱形柔性浮式防波堤的消浪效果展开断面试验研究,分析其在规则波和不规则波作用下的消浪特性。通过大量水槽试验给出了圆柱形柔性浮式防波堤透射系数、反射系数、衰减系数与锚固方式、试验水深、相对宽度的变化关系。研究结果表明:该结构形式的浮式防波堤对短周期波浪消浪效果明显,而对长周期波浪消浪效果不佳;锚固方式和水深对消浪效果的影响较小;相对宽度是影响消浪效果的主要因素。研究成果可为由该结构连接成的"V"形浮式防波堤的锚固方式和摆放角度的设计提供参考。     

防波堤U形槽深厚淤泥软基爆破

结合U形槽深厚淤泥软基的地质地形特点,运用爆炸挤淤理论研究新建围堤、防波堤通过U形槽处理深厚淤泥软基的问题,采用修建子堤作业平台,然后侧向拓宽的施工方法,进行U形槽深厚软基爆破的抛填控制参数和爆破参数设计,并优化施工工艺流程,选择了合适的装药设备。工程应用表明,先子堤、后侧向拓宽法爆破处理U形槽深厚软基可以达到设计要求,可为同类淤泥软基爆破提供参考。     

Genetic algorithm based support vector machine regression in predicting wave transmission of horizontally interlaced multi-layer moored floating pipe breakwater

Planning and design of coastal protection works like floating pipe breakwater require information about the performance characteristics of the structure in reducing the wave energy. Several researchers have carried out analytical and numerical studies on floating breakwaters in the past but failed to give a simple mathematical model to predict the wave transmission through floating breakwaters by considering all the boundary conditions. Computational intelligence techniques, such as, Artificial Neural Networks (ANN), fuzzy logic, genetic programming and Support Vector Machine (SVM) are successfully used to solve complex problems. In the present paper, a hybrid Genetic Algorithm Tuned Support Vector Machine Regression (GA-SVMR) model is developed to predict wave transmission of horizontally interlaced multilayer moored floating pipe breakwater (HIMMFPB). Furthermore, optimal SVM and kernel parameters of GA-SVMR models are determined by genetic algorithm. The GA-SVMR model is trained on the data set obtained from experimental wave transmission of HIMMFPB using regular wave flume at Marine Structure Laboratory, National Institute of Technology, Karnataka, Surathkal, Mangalore, India. The results are compared with ANN and Adaptive Neuro-Fuzzy Inference System (ANFIS) models in terms of correlation coefficient, root mean square error and scatter index. Performance of GA-SVMR is found to be reliably superior. b-spline kernel function performs better than other kernel functions for the given set of data.     

桶式基础气压模型试验和有限元分析

桶式基础结构是一种适用于软土地基的新型海工结构。为保证结构的可靠性,已对桶式基础使用期的承载力、稳定性和水动力特性进行了大量试验研究,但施工阶段的性状并未得到足够关注。为此制作了1∶8的小比尺模型并进行室内试验,研究设计规定的正压和负压下结构模型的内力、变形和气密性,获取了测点应变-加载时间的关系曲线。采用通用有限元软件ABAQUS对模型进行了弹性有限元分析并与试验结果比较。研究表明,桶式基础模型能承受设计规定的正压力和负压力,模型混凝土和钢筋应变变化规律与加压规律大体相符;弹性有限元分析结果与试验结果基本吻合。