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Discussion on Wave Transmission Coefficient Formulae of Submerged Breakwaters 被引量:2
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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
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Solution of Cauchy's Problem for Wave Equations in Higher Space Dimensions by Means of D'Alembert's Formula
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作者 Yao Duan-zheng Song Ke-hui Xiong Gui-guang 《Wuhan University Journal of Natural Sciences》 CAS 2000年第2期169-174,共6页
A simple method for solving Cauchy’s problem of wave equations in higher space dimensions with initial condition of separated variables, has been given by using D’Alembert’s formula and some examples have been shown.
关键词 Cauchy’s problem wave equation D’Alembert’s formula
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An available formula of the sandy beach state induced by plunging waves
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作者 JIANG Changbo WU Zhiyuan +3 位作者 CHEN Jie DENG Bin LONG Yuannan LI Lianjie 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第9期91-100,共10页
Laboratory experiments are performed to explore the response rule of a sandy beach profile under plunging wave on a non-uniform sediment-bed slope. The initial beach slope of combination of 1/10 and 1/20 is exposed to... Laboratory experiments are performed to explore the response rule of a sandy beach profile under plunging wave on a non-uniform sediment-bed slope. The initial beach slope of combination of 1/10 and 1/20 is exposed to regular waves and cnoidal waves respectively. The free surface elevation, process of wave propagation, wave breaking, uprush and backwash and the change of a cross-shore beach profile are measured and recorded. The beach profile under the regular waves action exhibits two parts: a sandbar profile and a beach berm profile, and only one typical profile transformation under the cnoidal waves action is obtained, which is the beach berm profile. In the laboratory experiments, it is found that the beach states under wave action related to the previous factors. In addition, they are related to the characteristic of breaking waves such as the breaking intensity of the plunging wave. A concept about the characteristic angle of the plunging wave has been put forward through the observation and analysis of the phenomenon of the laboratory experiment. A qualitative analysis about the sediment transport carrying by currents generated from the plunging wave and the state of beach profile under the wave action has been done. The quantitative analysis about the relationship between the characteristic angle and Irribarren number has been done. An available formula of equilibrium states for the sandy beach induced by the plunging wave has been established based on the relationship between Irribarren number and the beach profile. By fitting these experimental results and others' experimental results to three lines, the three fitting coefficients can be calculated in their formula respectively. The recommended empirical formulas can divide three states of a beach morphology profile obviously, which include a depositive beach, an erosive beach and an intermediate beach. 展开更多
关键词 formula of beach state plunging wave experimental study regular wave cnoidal wave
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Effects of surface waves and sea spray on air–sea fluxes during the passage of Typhoon Hagupit 被引量:6
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作者 HE Hailun WU Qiaoyan +4 位作者 CHEN Dake SUN Jia LIANG Chujin JIN Weifang XU Yao 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2018年第5期1-7,共7页
Air–sea exchange plays a vital role in the development and maintenance of tropical cyclones(TCs). Although studies have suggested the dependence of air–sea fluxes on surface waves and sea spray, how these processe... Air–sea exchange plays a vital role in the development and maintenance of tropical cyclones(TCs). Although studies have suggested the dependence of air–sea fluxes on surface waves and sea spray, how these processes modify those fluxes under TC conditions have not been sufficiently investigated based on in-situ observations.Using continuous meteorological and surface wave data from a moored buoy in the northern South China Sea,this study examines the effects of surface waves and sea spray on air–sea fluxes during the passage of Typhoon Hagupit. The mooring was within about 40 km of the center of Hagupit. Surface waves could increase momentum flux to the ocean by about 15%, and sea spray enhanced both sensible and latent heat fluxes to the atmosphere,causing Hagupit to absorb 500 W/m^2 more heat flux from the ocean. These results have powerful implications for understanding TC–ocean interaction and improving TC intensity forecasting. 展开更多
关键词 air-sea flux surface wave sea spray bulk formula tropical cyclone
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Numerical Study on Breaking Criteria for Solitary Waves 被引量:1
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作者 Chung-ren CHOU Ruey-syan SHIH John Z. YIM 《China Ocean Engineering》 SCIE EI 2003年第4期589-604,共16页
Studies of the breaking criteria for solitary waves on a slope are presented in this paper. The boundary element method is used to model the processes of shoaling and breaking of solitary waves on various slopes. Empi... Studies of the breaking criteria for solitary waves on a slope are presented in this paper. The boundary element method is used to model the processes of shoaling and breaking of solitary waves on various slopes. Empirical formulae that can be used to characterize the breaking of solitary waves are presented. These include the breaking index, the wave height, the water depth, and the maximum particle velocity at the point of breaking. Comparisons with the results of other researches are given. 展开更多
关键词 boundary element breaking indices empirical formula solitary wave
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THE LOCUS OF SHOCK FRONT OF SPHERICAL BLAST WAVES WITH BACK PRESSURE
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作者 吴寿荣 《Acta Mathematica Scientia》 SCIE CSCD 1994年第S1期73-77,共5页
This papaer presents an analytic formula for the locus of shock front of sphericalblast waves with back pressure. Meanwhile, it is shown that the wave velocity is inversely proportions to the area of shock wave in the... This papaer presents an analytic formula for the locus of shock front of sphericalblast waves with back pressure. Meanwhile, it is shown that the wave velocity is inversely proportions to the area of shock wave in the Lagrangian coordinate space. If shock wave ispropagating into the gas at rest, the wave velocity is also inversely propagating into the gasat rest, the wave velocity is also inversely proportional to the area of shock front in the Eulerian coordinate space. The results obtained are generally applicable and may be suited to thewave velocity of contracting spherical shock wave. 展开更多
关键词 Blast wave wave velocity formula Area.
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An explicit method for numerical simulation of wave equations 被引量:3
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作者 Liu Heng Liao Zhenpeng 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2009年第1期17-28,共12页
In this paper, a method to develop a hierarchy of explicit recursion formulas for numerical simulation in an irregular grid for scalar wave equations is presented and its accuracy is illustrated via 2-D and 1-D models... In this paper, a method to develop a hierarchy of explicit recursion formulas for numerical simulation in an irregular grid for scalar wave equations is presented and its accuracy is illustrated via 2-D and 1-D models. Approaches to develop the stable formulas which are of 2M-order accuracy in both time and space with Mbeing a positive integer for regular grids are discussed and illustrated by constructing the second order (M= 1) and the fourth order (M = 2) recursion formulas. 展开更多
关键词 wave equation numerical simulation explicit recursion formula finite element method
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Experimental study on the wave loads of twin-plate breakwaterunder oblique waves 被引量:2
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作者 GU Qian HUANG Guoxing +2 位作者 ZHANG Ningchuan LI Longxiang SHAO Zhong'an 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第12期100-109,共10页
In this study, systematic physical model tests were performed to investigate the wave forces on the twin-plate breakwater under irregular waves. Based on the experimental results, the effects of the relative plate wid... In this study, systematic physical model tests were performed to investigate the wave forces on the twin-plate breakwater under irregular waves. Based on the experimental results, the effects of the relative plate width B/L,wave height Hs/D and incident angle θ0 on the wave forces were analyzed and discussed. The results showed that:(1) The envelopes of the total wave pressure were generally symmetrical along the direction of plate width under the incident angles(θ0) being 0°, 15°, 30°, 45° and 60°. In particular, the envelopes of wave pressure atθ0=30° were larger than all other cases.(2) The synchronous pressure distribution of the breakwater under oblique wave action was more complicated comparing to the normal incident waves.(3) Based on data analysis, an empirical formula was obtained to estimate the total vertical force of the twin-plate breakwater.This empirical formula can be a good reference for the design basis of engineering applications under specified wave conditions. 展开更多
关键词 twin-plate breakwater oblique random wave wave load modeling test empirical formula
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Numerical Investigation of Run-ups on Cylinder in Steep Regular Wave 被引量:2
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作者 FAN Xiang ZHANG Jing-xin LIU Hua 《China Ocean Engineering》 SCIE EI CSCD 2019年第5期601-607,共7页
The run-up on offshore structures induced by the steep regular wave is a highly nonlinear flow with a free surface. This article focuses on the investigation of the steep regular wave run-up on a single vertical cylin... The run-up on offshore structures induced by the steep regular wave is a highly nonlinear flow with a free surface. This article focuses on the investigation of the steep regular wave run-up on a single vertical cylinder by solving the Navier-Stokes equations. A numerical wave tank is established based on the open-source package to simulate the wave scattering induced by a vertical cylinder. The VOF method is applied to capture the large deformation and breaking of the free surface. The numerical model is validated by experimental results. The relative wave run-ups on the front face and the back face along the centerline of a cylinder are analyzed. The changes of the relative run-ups with the wave steepness, the relative diameter and the relative depth are studied. It is found that the relative run-ups on the front face and the back face of the cylinder depend mainly on the wave steepness and the relative diameter, while the dependence on the relative depth is weak. The empirical formulae are proposed to calculate the relative run-ups in terms of the wave steepness of incident regular waves and the relative diameter of a cylinder. 展开更多
关键词 STEEP REGULAR wave vertical CYLINDER RUN-UP empirical formula numerical experiments
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Action of Cnoidal Waves on Vertical Walls
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作者 Qiu Dahong , Zang Jun and Jia Ying Academician of the Chinese Academy of Sciences, Professor, the State Key Laboratory of Coastal and Offshore Engineering (SLCOE), Dalian University of Technology (DUT), Dalian 116024. Former Ph. D Graduate Student, SLCOE, DUT, Dalian 116024. . Former M. S. Graduate Student, SLCOE, DUT, Dalian 116024 《China Ocean Engineering》 SCIE EI 1996年第2期129-144,共16页
Based on the 2nd order cnoidal wave theory, the characters of shallow water standing waves and their action on vertical walls are studied in this paper. The theoretical expressions of the wave surface elevation in fro... Based on the 2nd order cnoidal wave theory, the characters of shallow water standing waves and their action on vertical walls are studied in this paper. The theoretical expressions of the wave surface elevation in front of and the wave pressure on the vertical wall are obtained. In order to verify the theoretical results, model tests were made in the State Key Laboratory of Coastal and Offshore Engineering at DUT. For the wave surface elevation in front of the wall and the wave forces on the wall at the moment when the wave surface at the wall surface goes down to the bottom of the wave trough, the calculated results coincide quite well with the experimental results. For the wave forces on the wall at the moment when the wave surface at the wall surface goes up to the top of the wave crest, the theoretical expressions are modified by the experimental results. For the convenience of practical use, calculations are made for the wave conditions which usually occur in enginering practice by use of the investigated results obtained in this paper. Empirical formulas are fitted with these calculated results for designers to use. 展开更多
关键词 cnoidal wave vertical wall shallow water standing wave empirical formula
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Comparison of perfectly matched layer and multi-transmitting formula artificial boundary condition based on hybrid finite element formulation
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作者 李宁 谢礼立 翟长海 《Acta Seismologica Sinica(English Edition)》 CSCD 2007年第6期684-695,共12页
The theory of perfectly matched layer (PML) artificial boundary condition (ABC), which is characterized by absorption any wave motions with arbitrary frequency and arbitrarily incident angle, is introduced. The co... The theory of perfectly matched layer (PML) artificial boundary condition (ABC), which is characterized by absorption any wave motions with arbitrary frequency and arbitrarily incident angle, is introduced. The construction process of PML boundary based on elastodynamic partial differential equation (PDE) system is developed. Combining with velocity-stress hybrid finite element formulation, the applicability of PML boundary is investigated and the numerical reflection of PML boundary is estimated. The reflectivity of PML and multi-transmitting formula (MTF) boundary is then compared based on body wave and surface wave simulations. The results show that although PML boundary yields some reflection, its absorption performance is superior to MTF boundary in the numerical simulations of near-fault wave propagation, especially in comer and large angle grazing incidence situations. The PML boundary does not arise any unstable phenomenon and the stability of PML boundary is better than MTF boundary in hybrid finite element method. For a specified problem and analysis tolerance, the computational efficiency of PML boundary is only a little lower than MTF boundary. 展开更多
关键词 perfectly matched layer multi-transmitting formula elastodynamic wave artificial boundary hybrid finite element
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An explicit method for numerical simulation of wave equations: 3D wave motion 被引量:1
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作者 Liu Heng Liao Zhenpeng 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2011年第1期13-20,共8页
In this paper, an explicit method is generalized from 1D and 2D models to a 3D model for numerical simulation of wave motion, and the corresponding recursion formulas are developed for 3D irregular grids. For uniform ... In this paper, an explicit method is generalized from 1D and 2D models to a 3D model for numerical simulation of wave motion, and the corresponding recursion formulas are developed for 3D irregular grids. For uniform cubic grids, the approach used to establish stable formulas with 2M-order accuracy is discussed in detail, with M being a positive integer, and is illustrated by establishing second order (M=1) recursion formulas. The theoretical results presented in this paper are demonstrated through numerical testing. 展开更多
关键词 3D wave equation numerical simulation explicit recursion formula finite element method
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Wave uplift force on horizontal panels: a laboratory study
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作者 LIU Qingjun SUN Tianting +1 位作者 WANG Dengting WEI Zhangping 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第6期1899-1911,共13页
Accurate estimation of wave uplift force is essential to the designs of reliable coastal and marine structures.We presents a series of laboratory work here on the impact of regular waves on horizontal panels,from whic... Accurate estimation of wave uplift force is essential to the designs of reliable coastal and marine structures.We presents a series of laboratory work here on the impact of regular waves on horizontal panels,from which an empirical formula to estimate accurately the wave uplift force on panels is established.The laboratory measurements show that the wave uplift force depends mainly on the incident wave height,the wave period,the wave length,the panel width,and the clearance between the subsurface of the panel and the still water level.Among these factors,the impact of the panel width on uplift forces is relatively complicated.Result shows that the relative panel width(i.e.,the ratio of panel width to wave length)plays a more important role in estimating the wave uplift force.Based on our comprehensive laboratory measurements,we further developed an empirical formula to compute wave uplift force on horizontal panels through dimensionless analysis.Compared with other empirical formulas,this formula uses dimensionless variables of clear physical meanings,thus can describe the interaction between waves and the panels in a better way.In addition,the efficiency of the formula to estimate wave uplift force on horizontal panels is verified against existing works.Therefore,the findings in this study shall be useful for understanding the mechanism of wave uplift force on horizontal panels and numerical model validation. 展开更多
关键词 LABORATORY experiment wave-structure interaction HORIZONTAL PANELS wave UPLIFT force empirical formula
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Distribution Free Waves in Viscoelastic Wedge with an Arbitrary Angle Tops
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作者 Safarov Ismail Ibrahimovich Teshaev Mukhsin Khudoyberdiyevich +1 位作者 Akhmedov Maqsud Sharipovich Boltayev Zafar Ixtiyorovich 《Applied Mathematics》 2017年第5期736-745,共10页
In work questions of distribution of waves in a viscoelastic wedge with any corner of top is considered. The elastic cylinder with a radial crack is a wedge corner. The regional task for system of the differential equ... In work questions of distribution of waves in a viscoelastic wedge with any corner of top is considered. The elastic cylinder with a radial crack is a wedge corner. The regional task for system of the differential equations in private derivatives is decided by means of a method of straight lines that allows using a method of orthogonal prorace. 展开更多
关键词 The Cylinder The Differential Equations The Orthogonal Prorace Approximating formulaS A WEDGE of CORNER A wave Guide DISPERSIVE Dependence
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Wave functions of a new kind of nonlinear single-mode squeezed state
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作者 范洪义 笪诚 陈俊华 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第12期34-37,共4页
We explore the theoretical possibility of extending the usual squeezed state to those produced by nonlinear singlemode squeezing operators. We derive the wave functions of exp[-(ig/2)((1-X2)1/2P + P(1-X2)1/2)... We explore the theoretical possibility of extending the usual squeezed state to those produced by nonlinear singlemode squeezing operators. We derive the wave functions of exp[-(ig/2)((1-X2)1/2P + P(1-X2)1/2)]|0 in the coordinate representation. A new operator's disentangling formula is derived as a by-product. 展开更多
关键词 wave functions nonlinear single-mode squeezed states coordinate representation disentangling formula
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城市小流域暴雨的体积径流系数推求与应用
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作者 王文亮 苏成庆 +3 位作者 尹佳伟 田晓霞 郭纯园 李俊奇 《水资源保护》 北大核心 2025年第6期28-33,共6页
为提高城市小流域降雨径流计算方法的一致性,基于城市小流域水文基础理论,分析了推理公式法与SWMM运动波法计算地表径流量的异同,提出了涉及土壤类型、设计降雨强度及不透水面积比的体积径流系数推求方法。以北京为应用实例,利用提出的... 为提高城市小流域降雨径流计算方法的一致性,基于城市小流域水文基础理论,分析了推理公式法与SWMM运动波法计算地表径流量的异同,提出了涉及土壤类型、设计降雨强度及不透水面积比的体积径流系数推求方法。以北京为应用实例,利用提出的方法推求体积径流系数,代入推理公式计算了北京暴雨径流峰值流量,并与SWMM的计算结果进行对比。结果表明:在降雨和水文损失时空分布均匀的假设下,推理公式法是运动波法的特例,体积径流系数与雨量径流系数概念一致,与流量径流系数在数值上相等;基于体积径流系数,利用推理公式计算得到的北京暴雨径流峰值流量与SWMM计算结果具有较高的一致性。 展开更多
关键词 城市小流域 体积径流系数 推理公式法 SWMM 运动波法
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具有运输噪声的黏性守恒律方程平面稀疏波在周期扰动下的稳定性
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作者 张旭 戴文荣 《上海师范大学学报(自然科学版中英文)》 2025年第5期505-513,共9页
本文运用Ito公式与能量估计,探讨了在运输噪声影响下,黏性守恒律方程的平面稀疏波在周期扰动下的稳定性问题.研究结果表明,在期望的意义下,具有运输噪声和周期初值的平面稀疏波会以t-1/4收敛到一个近似稀疏波.
关键词 周期扰动 稀疏波 黏性守恒律 运输噪声 ITO公式
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内部带斜坡堆石开孔沉箱反射系数试验研究 被引量:1
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作者 沈家毅 刘晓 金瑞佳 《水道港口》 2025年第5期700-705,共6页
内部带斜坡堆石开孔沉箱是将传统沉箱的前壁开孔,与后实体墙之间形成消浪室,并在消浪室内部设置斜坡堆石。当波浪作用于带斜坡堆石开孔沉箱时,与消浪室内部斜坡堆石相互作用,并在沿斜坡堆石爬升过程中发生破碎,有效耗散波浪能量。通过... 内部带斜坡堆石开孔沉箱是将传统沉箱的前壁开孔,与后实体墙之间形成消浪室,并在消浪室内部设置斜坡堆石。当波浪作用于带斜坡堆石开孔沉箱时,与消浪室内部斜坡堆石相互作用,并在沿斜坡堆石爬升过程中发生破碎,有效耗散波浪能量。通过规则波物理模型试验,研究内部带斜坡堆石开孔沉箱防波堤反射系数与相对消浪室宽度、堆石相对淹没宽度、相对水深、波陡、堆石坡度、堆石空隙率等因素的相关关系,并提出反射系数的经验公式。将经验公式的计算结果与文献中试验数据进行对比,符合较好,可以为工程设计等提供重要参考。 展开更多
关键词 开孔沉箱 斜坡堆石 反射系数 经验公式 空隙率 消浪
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内孤立波作用下潜体载荷特性数值模拟研究
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作者 冀珂 郅长红 尤云祥 《江苏科技大学学报(自然科学版)》 2025年第1期8-16,共9页
内孤立波广泛存在于实际海洋中,由于其诱导的水平流速大,对海洋结构物水动力性能的影响不可忽视.近年来,针对内孤立波对浮式海洋结构物作用的载荷理论逐步完善,但对于内孤立波与潜体的作用特性有待进一步研究.文中将Morison公式和Froude... 内孤立波广泛存在于实际海洋中,由于其诱导的水平流速大,对海洋结构物水动力性能的影响不可忽视.近年来,针对内孤立波对浮式海洋结构物作用的载荷理论逐步完善,但对于内孤立波与潜体的作用特性有待进一步研究.文中将Morison公式和Froude-Krylov公式相结合,建立了内孤立波作用下水下潜体载荷的一种简化理论模型.基于流体体积(volume of fluid,VOF)方法,结合3类内孤立波理论模型,设计速度入口函数,开展内孤立波与水下潜体相互作用数值模拟研究,结合文献中的模型实验结果,对数值模拟方法的可靠性进行了验证.通过系列CFD模拟,结合水下潜体内孤立波载荷简化理论模型,获得了内孤立波作用下潜体模型拖曳力及惯性力系数的拟合公式.该简化理论模型对研究内孤立波作用下水下潜体的载荷特性具有一定的参考价值. 展开更多
关键词 内孤立波 潜体 Morison公式 惯性力 拖曳力 Froude-Krylov力
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螺栓声弹性标定系数与夹持长度关系的应用研究
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作者 娄燕祯 《科技创新与应用》 2025年第33期69-74,共6页
针对螺栓轴力检测前需要通过标定试验获得声弹性标定系数的问题,基于超声纵波法的测量公式,建立夹持长度与声弹性标定系数之间的关系。通过在试验室对不同夹持长度的10.9S级M24高强度螺栓进行声弹性标定试验,明确螺栓声弹性标定系数与... 针对螺栓轴力检测前需要通过标定试验获得声弹性标定系数的问题,基于超声纵波法的测量公式,建立夹持长度与声弹性标定系数之间的关系。通过在试验室对不同夹持长度的10.9S级M24高强度螺栓进行声弹性标定试验,明确螺栓声弹性标定系数与夹持长度之间的换算关系。为验证换算关系的准确性,通过另选已定夹持长度的10.9S级M24螺栓分别进行声弹性标定试验与数学换算关系计算后得出不同的系数值。经比较发现,螺栓标定试验得出的声弹性标定系数与数学换算关系计算得出的系数基本一致,其相对误差为-1.88%。经螺栓轴力检测精度验证试验发现,利用螺栓标定系数与夹持长度间的数学换算关系计算得到的系数同样可以有效检测螺栓轴力,轴力检测结果的相对误差保持在-2.38%与-2.06%之间。 展开更多
关键词 高强度螺栓连接 超声纵波测量公式 标定试验 数学计算 精度验证
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