期刊文献+
共找到13篇文章
< 1 >
每页显示 20 50 100
Numerical study on the characteristics of flow field and wave propagation near submerged breakwater on slope 被引量:6
1
作者 CHEN Jie JIANG Changbo +1 位作者 HU Shixiong HUANG Wenwei 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2010年第1期88-99,共12页
In this study, characteristics of flow field and wave propagation near submerged breakwater on a sloping bed are investigated with numerical model. The governing equations of the vertical two-dimensional model are Rey... In this study, characteristics of flow field and wave propagation near submerged breakwater on a sloping bed are investigated with numerical model. The governing equations of the vertical two-dimensional model are Reynolds Averaged Navier Stokes equations. The Reynolds stress terms are closed by a nonlinear k - ε turbulence transportation model. The free surface is traced through the PILC-VOF method. The proposed numerical model is verified with experimental results. The numerical result shows that the wave profile may become more asymmetrical when wave propagates over breakwater. When wave crest propagates over breakwater, the anticlockwise vortex may generate. On the contrary, when wave hollow propagates over breakwater, the clockwise vortex may generate. Meanwhile, the influenced zone of vortex created by wave crest is larger than that created by wave hollow. All the maximum values of the turbulent kinetic energy, turbulent dissipation and eddy viscosity occur on the top of breakwater. Both the turbulent dissipation and eddy viscosity increase as the turbulent kinetic energy increases. Wave energy may rapidly decrease near the breakwater because turbulent dissipation increases and energy in lower harmonics is transferred into higher harmonics. 展开更多
关键词 submerged breakwater characteristics of flow field PLIC-VOF method sloping bed
下载PDF
Scaled Boundary Finite Element Analysis of Wave Passing A Submerged Breakwater 被引量:3
2
作者 曹凤帅 滕斌 《China Ocean Engineering》 SCIE EI 2008年第2期241-251,共11页
The scaled boundary finite element method (SBFEM) is a novel semi-analytical technique combining the advantage of the finite element method (FEM) and the boundary element method (BEM) with its unique properties.... The scaled boundary finite element method (SBFEM) is a novel semi-analytical technique combining the advantage of the finite element method (FEM) and the boundary element method (BEM) with its unique properties. In this paper, the SBFEM is used for computing wave passing submerged breakwaters, and the reflection coeffcient and transmission coefficient are given for the case of wave passing by a rectangular submerged breakwater, a rigid submerged barrier breakwater and a trapezium submerged breakwater in a constant water depth. The results are compared with the analytical solution and experimental results. Good agreement is obtained. Through comparison with the results using the dual boundary element method (DBEM), it is found that the SBFEM can obtain higher accuracy with fewer elements. Many submerged breakwaters with different dimensions are computed by the SBFEM, and the changing character of the reflection coeffcient and the transmission coefficient are given in the current study. 展开更多
关键词 scaled boundary finite element method (SBFEM) potential flow wave action submerged breakwater reflection coeffwien transmission coeffwient
下载PDF
Discussion on Wave Transmission Coefficient Formulae of Submerged Breakwaters 被引量:2
3
作者 左其华 李鹏 +1 位作者 滕玲 王登婷 《China Ocean Engineering》 SCIE EI 2010年第1期57-66,共10页
Fifteen formulae of wave transmission coefficient for submerged breakwaters obtained during last 3 decades are presented, compared, and analyzed in this paper. The dimensionless parameters mainly involved in this disc... Fifteen formulae of wave transmission coefficient for submerged breakwaters obtained during last 3 decades are presented, compared, and analyzed in this paper. The dimensionless parameters mainly involved in this discussion are the relative submerged depth Re/h, relative wave height Rc/Hi, relative rubble size B/D50, relative breakwater width B√ HiL0 and wave breaker index ξ. It indicates that there exist notable differences among the computed results, which mainly originate from the limited experimental conditions and different analytical methods, even though the major tendency keeps similar. It is necessary to conduct more systematic studies to obtain better understanding about the mechanism of wave transmission over submerged breakwaters. 展开更多
关键词 submerged breakwaters wave transmission formulae DISCUSSION
下载PDF
Wave Attenuation Properties of Double Trapezoidal Submerged Breakwaters on Flat-Bed 被引量:2
4
作者 曹永港 蒋昌波 白玉川 《Transactions of Tianjin University》 EI CAS 2012年第6期401-410,共10页
This paper investigates the wave attenuation properties of the double trapezoidal submerged breakwaters on the flat-bed by conducting physical experiments subjected to linear and cnoidal incident waves.The method of G... This paper investigates the wave attenuation properties of the double trapezoidal submerged breakwaters on the flat-bed by conducting physical experiments subjected to linear and cnoidal incident waves.The method of Goda's two points is used to separate the heights of incident,reflected and transmitted waves based on the experimental data.The possible factors affecting the wave attenuation properties of the double trapezoidal submerged breakwaters(i.e.,the relative submerged water depth,relative breakwater spacing,wave steepness and relative wave height) are investigated with respect to the reflection and transmission coefficients.The results show that there is a range,within which the breakwater spacing has little impact on the reflection coefficient,and the transmission coefficient tends to be a constant.The influence of the wave steepness is reduced while the breakwater spacing is too large or too small.Within the range of the relative wave height tested in this study,the reflection and transmission coefficients increase and decrease with the relative wave height,respectively.The double trapezoidal submerged breakwaters model indicates a good attenuation effect for larger wave steepness,big relative wave height and within the range of the relative breakwater spacing between 12.5 and 14 according to linear and cnoidal waves.The changes of wave energy spectra between the double submerged breakwaters on the flat-bed are investigated by the fast Fourier transform(FFT) method,showing that wave energy dissipation can be reached more effectively when the relative breakwater spacing is 12.5. 展开更多
关键词 linear wave cnoidal wave double trapezoidal submerged breakwaters reflection coefficient transmis- sion coefficient attenuation coefficient
下载PDF
Bubble Size Distribution for Waves Propagating over A Submerged Breakwater 被引量:1
5
作者 TIEN Tsung-mo HUANG Ching-jer +2 位作者 HSU Tai-wen LEE Chien-hsun HSU Shi-sheng 《China Ocean Engineering》 SCIE EI 2008年第2期227-240,共14页
Experiments are carried out to study the characteristics of active bubbles entrained by breaking waves as these propagate over an abruptly topographical change or a submerged breakwater. Underwater sounds generated by... Experiments are carried out to study the characteristics of active bubbles entrained by breaking waves as these propagate over an abruptly topographical change or a submerged breakwater. Underwater sounds generated by the entrained air bubbles are detected by a hydrophone connected to a charge amplifier and a data acquisition system. The size distribution of the bubbles is then determined inversely from the received sound frequencies. The sound signals are converted from time domain to time-frequency domain by applying Gabor transform. The number of bubbles with different sizes are counted from the signal peaks in the time-frequency domain. The characteristics of the bubbles are in terms of bubble size spectra, which account for the variation in bubble probability density related to the bubble radius r. The experimental data demonstrate that the bubble probability density function shows a - 2.39 power-law sealing with radius for r 〉 0. 8 mm, and a- 1.11 power law for r 〈0.8 mm. 展开更多
关键词 breaking waves submerged breakwater underwater noise Gabor transform bubble-size spectra
下载PDF
Solitary Wave Propagation Influenced by Submerged Breakwater
6
作者 王锦 左其华 +1 位作者 王登婷 Shirin Shukrievab 《China Ocean Engineering》 SCIE EI CSCD 2013年第5期593-604,共12页
The form of Boussinesq equation derived by Nwogu (1993) using velocity at an arbitrary distance and surface elevation as variables is used to simulate wave surface elevation changes. In the numerical experiment, wat... The form of Boussinesq equation derived by Nwogu (1993) using velocity at an arbitrary distance and surface elevation as variables is used to simulate wave surface elevation changes. In the numerical experiment, water depth was divided into five layers with six layer interfaces to simulate velocity at each layer interface. Besides, a physical experiment was carried out to validate numerical model and study solitary wave propagation.“Water column collapsing”method (WCCM) was used to generate solitary wave. A series of wave gauges around an impervious breakwater were set-up in the flume to measure the solitary wave shoaling, run-up, and breaking processes. The results show that the measured data and simulated data are in good agreement. Moreover, simulated and measured surface elevations were analyzed by the wavelet transform method. It shows that different wave frequencies stratified in the wavelet amplitude spectrum. Finally, horizontal and vertical velocities of each layer interface were analyzed in the process of solitary wave propagation through submerged breakwater. 展开更多
关键词 solitary wave submerged breakwater wavelet spectrum propagation characteristics Boussinesq equation
下载PDF
Functional Design of A Series of Submerged Breakwaters for Coastal Protection Against Waves
7
作者 Li-Hung TSAI Chih-Chung WEN 《China Ocean Engineering》 SCIE EI 2010年第3期553-564,共12页
The purpose of this paper is to develop a functional method for designing a series of submerged breakwaters on practical topography. The method is used to verify the feasibility and effectiveness of Bragg breakwaters ... The purpose of this paper is to develop a functional method for designing a series of submerged breakwaters on practical topography. The method is used to verify the feasibility and effectiveness of Bragg breakwaters for coastal protection by using field topography. The first part of this paper provides definitions and procedures needed in the design process for applying the mechanism of Bragg reflection. Next, Bragg breakwaters are designed on the basis of the cross-sectional topography and then on the plane topography of the Mi-Tuo coast by following the proposed process and procedure. Numerical modeling (Hsu et al., 2003; Wen and Tsai, 2008) was used as a design and assessment tool. Finally, the effectiveness and feasibility of a Bragg breakwater was assessed by practical cases. Based on the mechanism of Bragg reflection, an optimum layout for a series of submerged breakwaters is proposed to protect the Mi-Tuo coast. The results indicate that the proper layout of a series of submerged creakwaters can achieve the objective of beach protection. 展开更多
关键词 a series of submerged breakwaters Bragg reflection coastal protection
下载PDF
The wave motion over a submerged Jarlan-type perforated breakwater 被引量:4
8
作者 LIU Yong XIE Luqiong ZHANG Zhehan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第5期96-102,共7页
The wave motion over a submerged larlan-type breakwater consisting of a perforated front wall and a solid rear wall was investigated analytically and experimentally. An analytical solution was developed using matched ... The wave motion over a submerged larlan-type breakwater consisting of a perforated front wall and a solid rear wall was investigated analytically and experimentally. An analytical solution was developed using matched eigenfunction expansions. The analytical solution was confirmed by previously known solutions for single and double submerged solid vertical plates, a multidomain boundary element method solution, and experimental data. The calculated results by the analytical solution showed that compared with double submerged vertical plates, the submerged Jarlan-type perforated breakwater had better wave-absorbing performance and lower wave forces. For engineering designs, the optimum values of the front wall porosity, relative submerged depth of the breakwater, and relative chamber width between front and rear walls were 0.1-0.2, 0.1-0.2, and 0.3-0.4, respectively. Interchanging the perforated front wall and solid rear wail may have no effect on the transmission coefficient. However, the present breakwater with a seaside perforated wall had a lower reflection coefficient. 展开更多
关键词 submerged breakwater Jarlan-type structure analytical solution hydrodynamic performance
下载PDF
RANS Modeling of Solitary Wave Propagation over A Submerged Rectangular Breakwater 被引量:1
9
作者 Tai-Wen HSU Chin-Yen TSAI 《China Ocean Engineering》 SCIE EI 2009年第3期473-488,共16页
In this paper a series of numerical simulations are performed to investigate the vortex shedding mechanism for a solitary wave propagating over a submerged breakwater by use of Reynolds averaged Navier-Stokes (RAINS... In this paper a series of numerical simulations are performed to investigate the vortex shedding mechanism for a solitary wave propagating over a submerged breakwater by use of Reynolds averaged Navier-Stokes (RAINS) model combined with a k-ε model. Flows of different Reynolds numbers up to Re = 1.4 × 10^5 corresponding to varying incident wave heights are considered in which the characteristic fluid velocity is represented by the maximum horizontal velocity above the submerged breakwater. For the verification of the accuracy of the numerical model, the incident waves and the velocity field in the vicinity of the breakwater are compared with experimental data. The result shows that the model is capable of describing vortex shedding for a solitary wave propagating over a rectangular submerged breakwater. Key features of vortex generation, evolution and dissipation are investigated. It is found that the vortex shedding and their evolution due to separated boundary layer over the breakwater are strongly related to the Reynolds number. A considerable number of vortices and complicated vortex pattern are observed as the Reynolds number increases. 展开更多
关键词 RANS modeling solitary wave vortex shedding submerged breakwater
下载PDF
Flow Separation and Vortex Dynamics in Waves Propagating over A Submerged Quartercircular Breakwater 被引量:2
10
作者 JIANG Xue-lian YANG Tian +1 位作者 ZOU Qing-ping GU Han-bin 《China Ocean Engineering》 SCIE EI CSCD 2018年第5期514-523,共10页
The interactions of cnoidal waves with a submerged quartercircular breakwater are investigated by a ReynoldsAveraged Navier–Stokes(RANS) flow solver with a Volume of Fluid(VOF) surface capturing scheme(RANSVOF) model... The interactions of cnoidal waves with a submerged quartercircular breakwater are investigated by a ReynoldsAveraged Navier–Stokes(RANS) flow solver with a Volume of Fluid(VOF) surface capturing scheme(RANSVOF) model. The vertical variation of the instantaneous velocity indicates that flow separation occurs at the boundary layer near the breakwater. The temporal evolution of the velocity and vorticity fields demonstrates vortex generation and shedding around the submerged quartercircular breakwater due to the flow separation. An empirical relationship between the vortex intensity and a few hydrodynamic parameters is proposed based on parametric analysis. In addition, the instantaneous and time-averaged vorticity fields reveal a pair of vortices of opposite signs at the breakwater which are expected to have significant effect on sediment entrainment, suspension, and transportation,therefore, scour on the leeside of the breakwater. 展开更多
关键词 submerged quartercircular breakwater cnoidal wave flow separation vortex dynamics SCOUR
下载PDF
Experimental Research on Wave Transmission over Submerged Rubble-Mound Breakwaters 被引量:2
11
作者 左其华 Valeri PENCHEV +2 位作者 李鹏 Dorina DRAGANCHEVA 王登婷 《China Ocean Engineering》 SCIE EI 2008年第4期575-584,共10页
This paper discusses some previous, and presents some new experimental results on wave transmission over submerged breakwaters. The objective of this study is to evaluate wave transmission coefficient and develop a tw... This paper discusses some previous, and presents some new experimental results on wave transmission over submerged breakwaters. The objective of this study is to evaluate wave transmission coefficient and develop a two-dimensional (2D) model as an improvement to the existing wave transmission coefficient models. Factors which affect wave transmission over stbmerged breakwaters are discussed through a series of laboratory experiments. Basic recommendations for evaluation and design of submerged rubble-monud breakwaters are presented. From the test results, a calculation formula of wave transmission coefficient is proposed. 展开更多
关键词 submerged rubble breakwater wave transmission coefficient wave dissipation laboratory experiment
下载PDF
Wave Height Transformation and Set-up Between A Submerged Permeable Breakwater and A Seawall
12
作者 蔡清标 余建弘 +1 位作者 陈鸿彬 陈信佑 《China Ocean Engineering》 SCIE EI 2012年第1期167-176,共10页
In this study, we investigated wave transformation and wave set-up between a submerged permeable breakwater and a seawall. Modified time-dependent mild-slope equations, which involve parameters of the porous medium, w... In this study, we investigated wave transformation and wave set-up between a submerged permeable breakwater and a seawall. Modified time-dependent mild-slope equations, which involve parameters of the porous medium, were used to calculate the wave height transformation and the mean water level change around a submerged breakwater. The numerical solution is verified with experimental data. The simulated results show that modulations of the wave profile and wave set-up are clearly observed between the submerged breakwater and the seawall. In contrast to cases without a seawall, the node or pseudo-node of wave height evolution can be found between the submerged breakwater and the seawall. Higher wave set-up occurs if the nodal or pseudo-nodal point appears near the submerged breakwater. We also examined the influence of the porosity and friction factor of the submerged permeable breakwater on wave transformation and set-up. 展开更多
关键词 wave height transformation water piling-up wave set-up submerged permeable breakwater seawall time-dependent mild-slope equations
下载PDF
WAVE MOTION OVER TWO SUBMERGED LAYERS OF HORIZONTAL THICK PLATES 被引量:12
13
作者 LIU Yong LI Yu-cheng TENG Bin 《Journal of Hydrodynamics》 SCIE EI CSCD 2009年第4期453-462,共10页
This study investigates the hydrodynamic performance of a submerged two layer horizontal plate breakwater. The plate thickness is considered as non-zero in the study. In the context of linear potential theory, an anal... This study investigates the hydrodynamic performance of a submerged two layer horizontal plate breakwater. The plate thickness is considered as non-zero in the study. In the context of linear potential theory, an analytical solution for interaction of water waves with the plates is obtained using the matched eigenfunction expansion method. The solution consists of a symmetric part and an antisymmetric part. Its validity is confirmed by comparing the numerical results of reflection and transmission coefficients for limiting cases with previous predictions. Numerical examples are given to examine the major factors that affect the reflection and transmission coefficients of the plates. Some useful results are presented for engineering design. 展开更多
关键词 submerged breakwater horizontal thick plate reflection coefficient transmission coefficient
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部