A model for obliquely incident wave interacting with a multi-layered object     

《Applied Ocean Research》2019

This paper presents an analytical solution for scattering of oblique incident, small amplitude, monochromatic wave trains by a stationary rigid multi-layered objects with rectangular cross-section. The object is infinite long and consists of multilayers, which can be either solid or permeable. This paper extends the previous work by Hu and Liu [1] from normal incident wave condition with a special object configuration to oblique incident waves with multi-layered object. The present model is validated with several existing solutions for normal/oblique waves interacting with a single object; excellent agreement is observed. New numerical results are presented to investigate the effects of incidence angle on reflection, transmission and energy loss coefficients for a combined floating and bottom-mounted permeable breakwater. A new floating board-cage breakwater is developed from the present model and its solutions are discussed in detail. A computer program, AWAS-P, has been updated so that it is applicable for both oblique and normal incident waves, while the object is multi-layered.  相似文献   

Two-dimensional translation,rocking, and waves in a building during soil-structure interaction excited by a plane earthquake SV-wave pulse     

《Soil Dynamics and Earthquake Engineering》2016

A two-dimensional (2-D) model of a building supported by a rectangular, flexible foundation embedded in the soil is analyzed for excitation by an incident plane SV-wave. The incidence is below the critical angle. The building is assumed to be anisotropic and linear while the soil and the foundation are assumed to be isotropic and can experience nonlinear deformations. In general the work spent for the development of nonlinear strains in the soil can consume a significant part of the input wave energy and thus less energy is available for the excitation of the building. We show that the energy distribution in the building depends on the nature of the incident wave and differs substantially between the cases of incident P- and SV-waves. However, for both excitation by a plane SV-wave pulse and excitation by a P-wave, we show that the nonlinear response in the soil and the foundation does not significantly change the nature of excitation of the base of the building. It is noted that the building response can be approximated by translation and rocking of the base only for excitation by long, strong motion waves.  相似文献   

A method to determine the incident wave boundary conditions and its application   总被引：1，自引：0，他引：1  

饶永红  梁书秀  俞聿修 《中国海洋工程》2012,26(2):205-216

When studying the harbor water tranquility, cases are often confronted as that the verification point is not located on the generation line or that the angle between the generation line and the isobath is so large that the differences of the wave climates along the generation line can not be ignored. For these cases, the incident boundary conditions are difficult to evaluate. In order to solve this problem, a combined wave model is developed in the present paper based on the Boussinesq equation and the wave action balance equation. Instead of the one-line wave generation method, a multi-line generation method is proposed for the combined model. Application of this method is given to a case that the harbor is designed with two entrances and the angle between the generation line and the isobath is large and the results are shown reasonable. We suggest that the wave generation method on multi-lines might also be introduced to the wave physical model as the replacement for the one-line generation method.  相似文献   

Kinematic response of single piles to vertically incident P‐waves          下载免费PDF全文

Qijian Liu  Fangjun Deng  Yibin He 《地震工程与结构动力学》2014,43(6):871-887

Dynamic response of single piles to seismic waves is fundamentally different from the free‐field motion because of the interaction between the pile and the surrounding soil. Considering soil–pile interaction, this paper presents a new displacement model for the steady‐state kinematic response of single piles to vertically incident P‐waves on the basis of a continuum model. The governing equations and boundary conditions of the two undetermined functions in the model are obtained to be coupled by using Hamilton's principle. Then, the two unknown functions are decoupled and solved by an iterative algorithm numerically. A parametric study is performed to investigate the effects of the properties of the soil–pile system on the kinematic response of single piles. It is shown that the effects of the pile–soil modulus ratio, the slenderness ratio of the pile, and the frequency of the incident excitations are very significant. By contrast, the influence of soil damping on the kinematics of the system is slight and can be neglected. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

基于概率理论的折线形滑坡锚固结构受力     

徐鸿彪  叶尚其  刘汉香 《地质灾害与环境保护》2014,25(4):93-98

引入折线形滑坡锚固结构的最大概然入射线、期望角两个概念,来计算折线形滑坡锚固结构的受力情况。用期望角代替整个折线形滑面的倾角,可以将折线形滑坡锚固受力计算转变为直线形滑坡锚固结构的受力计算。实例表明,该法明显简化了折线形滑坡的锚固结构受力计算流程,可为折线形滑坡的锚固支护设计提供参考。  相似文献   

A Numerical Model for Nonlinear Wave Propagation on Non-uniform Current   总被引：3，自引：0，他引：3  

张洪生  王卫远  冯文静  杨建民  卢士强 《中国海洋工程》2010,24(1):15-28

On the basis of the new type Boussinesq equations (Madsen et al.,2002),a set of equations explicitly including the effects of currents on waves are derived.A numerical implementation of the present equations in one dimension is described.The numerical model is tested for wave propagation in a wave flume of uniform depth with current present.The present numerical results are compared with those of other researchers.It is validated that the present numerical model can reasonably reflect the nonlinear influences of currents on waves.Moreover,the effects of inputting different incident boundary conditions on the calculated results are studied.  相似文献   

湖北省公共应急服务地理信息平台应用研究     

聂小波  邱儒琼  肖昶  王慧妮  赵礼剑 《地理空间信息》2011,9(2):43-45,48

分析了省级应急平台体系之基础地理信息平台的需求,阐述了如何基于数字空间信息基础设施,利用网络地理信息系统技术(WebGIS)来整合基础地理信息资源以及公共应急专题资源,建设省级公共应急服务地理信息平台的总体设计和技术实现.  相似文献   

Apparent velocity estimation with P-SV ratio method     

Yuewei Liu  Hongnan Li 《地震工程与工程振动(英文版)》2011,10(3):393-402

The apparent velocity of the incident wave is an important parameter for simulating rotational ground motion with theoretical methods, but it is difficult to estimate effectively when there is only a single record. This paper discusses a P-SV ratio method based on elastodynamic theory in a multi-layer isotropic elastic half space. The apparent velocities of four earthquakes in the SMART1 array are calculated with this method. The result is close to a method that uses travel time analysis. Furthermore, the f...  相似文献   

碟形越浪式波能发电装置越浪性能的试验研究     

黄燕  史宏达  刘臻 《中国海洋大学学报(自然科学版)》2011,41(3):93-98

碟形越浪式波能发电装置是1种新型的波能发电装置,本文对其几何形状及尺寸进行了初始设计。通过对装置越浪性能的物理模型试验研究,揭示了装置越浪量与入射波要素的变化关系,得到了不同干舷高度在各入射波要素下装置的波能俘获能力。  相似文献   

Analysis of Directional Spectra and Reflection Coefficients in Incident and Reflected Wave Field     

柳淑学  俞聿修 《中国海洋工程》2001,(3):417-428

In this paper, the modified Bayesian method for the analysis of directional wave spectra and reflection coefficients is verified by numerical and physical simulation of waves. The results show that the method can basically separate the incident and reflected directional spectra. In addition, the effect of the type of wave gage arrays, the number of measured wave properties, and the distance between the wave gage array and the reflection line on the resolution of the method are investigated. Some suggestions are proposed for practical application.  相似文献