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The force of oblique incident wave on the breakwater with a partially perforated wall

Acta Oceanologica Sinica 2005年第4期24卷 125-134页

作者： LI Yucheng1*, LIU Hongjie2, DONG Guohai11. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China2. Zhejiang Provincial Plan Design & Research Institute of Communications, Hangzhou 310006, China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023 China Zhejiang Provincial Plan Design Research Institute of Communications Hangzhou 310006 China

wave forces induced by the interaction between the oblique incident wave and the breakwater with a partially perforated front wall isinvestigated. The fluid domain is divided into two sub-domains and the eigen-function expansion method is applied to expanding ve-locity potentials in each domain. In the eigen-expansion of the velocity potential, evanescent waves are included. Numerical results ofthe present model are compared with other theories and a good agreement can be found between them. Experimental data have beencompared with the present theoretical results. The effect of the traverse wall on wave forces has been discussed in detail. On the basisof the linear wave theory, it is shown that in the range of engineering practice, the incident angle of wave has small influence on waveforces on the unit length of perforated caisson.

关键词： partially perforated oblique incident wave wave force

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First-order approximate analytical expressions of oblique incident elastic wave at an interface of porous media saturated with a nonviscous fluid

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Petroleum Science 2022年第6期19卷 2720-2740页

作者： Dong-Yong Zhou Xing-Yao Yin Xiao-Tao Wen Xi-Lei He Zhen-Hua He State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengduSichuan610059China Key Laboratory of Earth Exploration and Information Technology of Ministry of Education Chengdu University of TechnologyChengduSichuan610059China College of Geosciences and Technology China University of Petroleum(East China)QingdaoShandong266580China

The analysis technology of Amplitude Variation with Offset(AVO)is one of the important methods for oil and gas reservoir *** equation and its approximations are the theoretical basis of AVO analysis,which assumes that the upper and lower media of a horizontal interface are single-phase *** by this assumption,AVO analysis has limited prediction and identification accuracy for complex porous *** view of this,the first-order approximate analytical expressions of oblique elastic wave at an interface of porous media are ***,the incident and scattering characteristics of various waves at the interface of porous media are analyzed,and the displacement vectors generated by these elastic waves are described by exponential ***,the kinematic and dynamic boundary conditions at the interface of porous media are ***,by substituting the displacement vectors of incident and scattered waves into boundary conditions,the exact analytical equation is ***,considering the symmetry of scattering matrix in the equation,the exact analytical expressions of each scattered wave are ***,under the assumptions of small incident angle,weak elasticity at an interface of porous media,and ignoring the second-and higherorder terms,the first-order approximate analytical expressions are *** a model of sandstone porous media with different porosity in upper and lower media,the correctness of the approximate analytical expressions is verified,and the elastic wave response characteristics of lithology and pore fluids are analyzed.

关键词： First-order approximate expressions oblique incident wave Elastic plane wave Porous media Scattering coefficient

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REFLECTION OF oblique incident waveS BY PERFORATED CAISSONS WITH TRAVERSE WALL

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Journal of Hydrodynamics 2005年第3期17卷 257-268页

作者： LIYu-cheng LIUHong-jie DONGGuo-hai StateKeyLaboratoryofCoastalandOffshoreEngineering DalianUniversityofTechnologyDalian116023China ZhejiangProvincialPlanDesignandResearchInstituteofCommunications Hangzhou310006China

The interaction of oblique incident waves with infinite number of perforated caissons is investigated. The fluid domain is divided into infinite sub-domains by the caissons, and eigen-function expansion is applied to expand velocity potentials in each domain. A phase relation is introduced for wave oscillation in each caisson, and the structure geometry is considered in constructing the models of reflection waves. The reflected waves with the present analysis include all of the waves traveling in different directions when incident wave period is short. Numerical examinations show that velocities at the inner and outer sides of the front walls of caissons ase close to each other, and reflection coefficients satisfy the energy conservation relation very well when porous effect parameter is infinite. Numerical results show that the reflection coefficients of oblique incident waves are smaller for shorter caissons at low frequency, and decrease with the increase of wave incident angle.

关键词： wave reflection oblique incident wave traverse wall perforated caisson eigen-function expansion

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oblique wave Trapping by a Surface-Piercing Flexible Porous Barrier in the Presence of Step-Type Bottoms

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Journal of Marine Science and Application 2019年第4期18卷 433-443页

作者： H.Behera S.Ghosh SRM Research Institute SRM Institute of Science and TechnologyKattankulathurTamil NaduIndia Department of Mathematics SRM Institute of Science and TechnologyKattankulathurTamil NaduIndia NLPCU Faculty of SciencesUniversitélibre de BruxellesBrusselsBelgium

The present study deals with the oblique wave trapping by a surface-piercing flexible porous barrier near a rigid wall in the presence of step-type bottoms under the assumptions of small amplitude water waves and the structural response theory in finite water *** modified mild-slope equation along with suitable jump conditions and the least squares approximation method are used to handle the mathematical boundary value *** types of edge conditions,i.e.,clamped-moored,clamped-free,moored-free,and moored-moored,are considered to keep the barrier at a desired position of *** role of the flexible porous barrier is studied by analyzing the reflection coefficient,surface elevation,and wave forces on the barrier and the rigid *** effects of step-type bottoms,incidence angle,barrier length,structural rigidity,porosity,and mooring angle are *** study reveals that in the presence of a step bottom,full reflection can be found periodically with an increase in(i)wave number and(ii)distance between the barrier and the rigid ***,nearly zero reflection can be found with a suitable combination of wave and structural parameters,which is desirable for creating a calm region near a rigid wall in the presence of a step bottom.

关键词： oblique incident wave wave trapping Surface-piercing Flexible porous barrier Mild-slope approximation Least squares approximation

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