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Unveiling three-dimensional sea surface signatures caused by internal solitary waves:insights from the surface water ocean topography mission
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作者 Xudong ZHANG Xiaofeng LI 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第3期709-714,共6页
Internal solitary waves(ISW),characterized by large amplitude and long propagation distance,are widespread in global oceans.While remote sensing images have played an essential role in studying ISWs,they mainly exploi... Internal solitary waves(ISW),characterized by large amplitude and long propagation distance,are widespread in global oceans.While remote sensing images have played an essential role in studying ISWs,they mainly exploit two-dimensional image information.However,with the launch of the surface water ocean topography(SWOT)satellite on December 16,2022,a unique opportunity has emerged to capture wide-swath three-dimensional ISW-induced sea surface information.In this study,we examine ISWs in the Andaman Sea using data from the Ka-band Radar Interferometer(KaRIN),a crucial sensor onboard SWOT.KaRIN not only provides backscattering satellite images but also employs synthetic aperture interferometry techniques to retrieve wide-swath two-dimensional sea surface height measurements.Our observations in the Andaman Sea revealed the presence of ISWs characterized by dark-bright strips and surface elevation solitons.The surface soliton has an amplitude of 0.32 m,resulting in an estimation of ISW amplitude of approximately 60 m.In contrast to traditional two-dimensional satellite images or nadir-looking altimetry data,the SWOT mission’s capability to capture threedimensional sea surface information represents a significant advancement.This breakthrough holds substantial promise for ISW studies,particularly in the context of ISW amplitude inversion. 展开更多
关键词 internal solitary wave(isw) surface water ocean topography(SWOT) ALTIMETER
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Experimental study on the variation of optical remote sensing imaging characteristics of internal solitary waves with wind speed
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作者 Zhe CHANG Lina SUN +4 位作者 Tengfei LIU Meng ZHANG Keda LIANG Junmin MENG Jing WANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第2期408-420,共13页
Optical remote sensing has been widely used to study internal solitary waves(ISWs).Wind speed has an important effect on ISW imaging of optical remote sensing.The light and dark bands of ISWs cannot be observed by opt... Optical remote sensing has been widely used to study internal solitary waves(ISWs).Wind speed has an important effect on ISW imaging of optical remote sensing.The light and dark bands of ISWs cannot be observed by optical remote sensing when the wind is too strong.The relationship between the characteristics of ISWs bands in optical remote sensing images and the wind speed is still unclear.The influence of wind speeds on the characteristics of the ISWs bands is investigated based on the physical simulation experiments with the wind speeds of 1.6,3.1,3.5,3.8,and 3.9 m/s.The experimental results show that when the wind speed is 3.9 m/s,the ISWs bands cannot be observed in optical remote sensing images with the stratification of h_(1)∶h_(2)=7∶58,ρ_(1)∶ρ_(2)=1∶1.04.When the wind speeds are 3.1,3.5,and 3.8 m/s,which is lower than 3.9 m/s,the ISWs bands can be obtained in the simulated optical remote sensing image.The location of the band’s dark and light extremum and the band’s peak-to-peak spacing are almost not affected by wind speed.More-significant wind speeds can cause a greater gray difference of the light-dark bands.This provided a scientific basis for further understanding of ISW optical remote sensing imaging. 展开更多
关键词 internal solitary wave(isw) optical remote sensing wind speed characteristics of isws bands
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Deformation and Stress Analysis of the Deepwater Steel Lazy Wave Riser Subjected to Internal Solitary Waves 被引量:1
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作者 LI Fuheng GUO Haiyan +2 位作者 GU Honglu LIU Zhen LI Xiaomin 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第2期377-392,共16页
The dynamic response of the steel lazy wave riser(SLWR)subjected to the internal solitary wave is a key to assessing its application feasibility.The innovation of this paper is to study the dynamic response properties... The dynamic response of the steel lazy wave riser(SLWR)subjected to the internal solitary wave is a key to assessing its application feasibility.The innovation of this paper is to study the dynamic response properties of the SLWR with large deformation characteristics under internal wave excitation.A numerical scheme of the SLWR is constructed using the slender-rod theory,and the internal solitary wave(ISW)with a two-layer seawater model is simulated by the extended Korteweg-deVries equation.The finite element method combined with the Newmark-βmethod is applied to discretize the equations and update the time integration.The ISW excitation combined with vessel motion on the dynamic deformation and stress of the SLWR is investigated,and extensive simulations of the ISW parameters,including the interface depth ratio and density difference,are carried out.Case calculation reveals that the displacement of the riser in the lower interface layer increases significantly under the ISW excitation,and the stresses at a part of both ends grow evidently.Moreover,the mean value of riser responses under a combination of vessel motion and ISW coincides with the ISW-induced ones.Furthermore,the dynamic responses along the whole riser,including the displacement amplitudes,bending moment amplitudes,and stress amplitudes,almost increase with the increase in interface depth ratios and density differences. 展开更多
关键词 steel lazy wave riser(SLWR) internal solitary wave(isw) slender-rod theory DEFORMATION stress
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Linear analysis of the dynamic response of a riser subject to internal solitary waves
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作者 Dalin TAN Xu WANG +1 位作者 Jinlong DUAN Jifu ZHOU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第6期1023-1034,共12页
The flow field induced by internal solitary waves(ISWs)is peculiar wherein water motion occurs in the whole water depth,and the strong shear near the pycnocline can be generated due to the opposite flow direction betw... The flow field induced by internal solitary waves(ISWs)is peculiar wherein water motion occurs in the whole water depth,and the strong shear near the pycnocline can be generated due to the opposite flow direction between the upper and lower layers,which is a potential threat to marine risers.In this paper,the flow field of ISWs is obtained with the Korteweg-de Vries(Kd V)equation for a two-layer fluid system.Then,a linear analysis is performed for the dynamic response of a riser with its two ends simply supported under the action of ISWs.The explicit expressions of the deflection and the moment of the riser are deduced based on the modal superposition method.The applicable conditions of the theoretical expressions are discussed.Through comparisons with the finite element simulations for nonlinear dynamic responses,it is proved that the theoretical expressions can roughly reveal the nonlinear dynamic response of risers under ISWs when the approximation for the linear analysis is relaxed to some extent. 展开更多
关键词 internal solitary wave(isw) RISER dynamic response linear analysis
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Combined effects of topography and bottom friction on shoaling internal solitary waves in the South China Sea 被引量:2
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作者 Dalin TAN Jifu ZHOU +1 位作者 Xu WANG Zhan WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2019年第4期421-434,共14页
A numerical study to a generalized Korteweg-de Vries (KdV) equation is adopted to model the propagation and disintegration of large-amplitude internal solitary waves (ISWs) in the South China Sea (SCS). Based on theor... A numerical study to a generalized Korteweg-de Vries (KdV) equation is adopted to model the propagation and disintegration of large-amplitude internal solitary waves (ISWs) in the South China Sea (SCS). Based on theoretical analysis and in situ measurements, the drag coefficient of the Chezy friction is regarded as inversely proportional to the initial amplitude of an ISW, rather than a constant as assumed in the previous studies. Numerical simulations of ISWs propagating from a deep basin to a continental shelf are performed with the generalized KdV model. It is found that the depression waves are disintegrated into several solitons on the continental shelf due to the variable topography. It turns out that the amplitude of the leading ISW reaches a maximum at the shelf break, which is consistent with the field observation in the SCS.Moreover, a dimensionless parameter defining the relative importance of the variable topography and friction is presented. 展开更多
关键词 internal SOLITARY wave(isw) SOUTH China Sea(SCS) Chezy friction vari-able TOPOGRAPHY
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Experimental Investigation and Prediction Model of the Loads Exerted by Oblique Internal Solitary Waves on FPSO 被引量:2
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作者 ZHANG Rui-rui WANG Hong-wei +3 位作者 CHEN Ke YOU Yun-xiang ZHANG Shu-guang XIONG Xiao-hu 《China Ocean Engineering》 SCIE EI CSCD 2022年第2期179-190,共12页
By using a 30-meter-long wave flume equipped with a double-plate wave maker,a series of depression ISWs were generated in a density stratified two-layer fluid and the forces exerted by oblique internal solitary waves(... By using a 30-meter-long wave flume equipped with a double-plate wave maker,a series of depression ISWs were generated in a density stratified two-layer fluid and the forces exerted by oblique internal solitary waves(ISWs)on fixed FPSO model had been measured.According to the laboratory experiments,a numerical flume taken the applicability of KdV,eKdV and MCC ISWs theories in consideration was adopted to study the force components.Based on the experimental data and the force composition,the simplified prediction model was established.It was shown that the horizontal and transversal loads consisted of two parts:the Froude−Krylov force that could be calculated by integrating the dynamic pressure induced by ISW along the FPSO wetted surface,as well as the viscous force that could be obtained by multiplying the friction coefficient Cfx(C_(fy)),correction factor K_(x)(K_(y))and the integration of particle tangential velocity along the FPSO wetted surface.The vertical load was mainly the vertical Froude−Krylov force.Based on the experimental results,a conclusion can be drawn that the friction coefficient Cf and correction factor K were regressed as a relationship of Reynolds number Re,Keulegan-Carpenter number KC,upper layer depth h1/h and ISW accident angleα.Moreover,the horizontal friction coefficient Cfx yielded the logarithmic function with Re,and transversal friction coefficient C_(fy)obeyed the exponent function with Re,while the correction factors K_(x)and K_(y)followed power function with KC.The force prediction was also performed based on the regression formulae and pressure integral.The predicted results agreed well with the experimental results.The maximum forces increase linearly with the ISWs amplitude.Besides,the upper layer thickness had an obvious influence on the extreme value of the horizontal and transversal forces. 展开更多
关键词 internal solitary wave(isw) FPSO wave forces friction coefficient and correction factor accident angle
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Internal solitary wave generation by the tidal flows beneath ice keel in the Arctic Ocean 被引量:1
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作者 Peiwen ZHANG Qun LI +1 位作者 Zhenhua XU Baoshu YIN 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2022年第3期831-845,共15页
A series of non-hydrostatic,non-linear numerical simulations were carried out to investigate the generation and evolution of internal solitary waves(ISWs)through the interaction of a barotropic tidal current with an i... A series of non-hydrostatic,non-linear numerical simulations were carried out to investigate the generation and evolution of internal solitary waves(ISWs)through the interaction of a barotropic tidal current with an ice keel in the Arctic Ocean.During the interaction process,the internal surge was generated at first,and then the wave gradually steepened due to non-linearity during its propagation away from the ice keel.The internal surge eventually disintegrated into multi-modal and rank-ordered ISW packets with the largest having an amplitude of O(10)m.Sensitivity experiments demonstrated that the ISWs’amplitudes and energy were proportional to the varying ice keel depths and barotropic tidal fl ow amplitudes,but were insensitive to the changing ice keel widths.Typical ISWs can enhance the turbulent dissipation rate of O(10^(-6))W/kg along their propagation path.Further,heat entrainment induced by the wave-ice interaction can reach O(10)MJ/m per tidal cycle.This study reveals a particular ISW generation mechanism and process in the polar ice environment,which could be important in impacting the energy transfer and heat balance in the Arctic Ocean. 展开更多
关键词 internal solitary wave(isw) barotropic tidal flow ice keel the Arctic Ocean
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半潜式平台立柱群内孤立波载荷的预报方法 被引量:1
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作者 刘一 张晶晶 +1 位作者 陈科 尤云祥 《船舶工程》 CSCD 北大核心 2022年第6期147-153,181,共8页
利用大型重力式密度分层水槽开展半潜式平台内孤立波载荷试验,基于3种不同的内孤立波理论,针对半潜式平台的立柱群建立内孤立波载荷理论预报模型,并确定Morison公式中惯性力和拖曳力系数的选取方法。研究表明,雷诺数、Keulegan-Carpente... 利用大型重力式密度分层水槽开展半潜式平台内孤立波载荷试验,基于3种不同的内孤立波理论,针对半潜式平台的立柱群建立内孤立波载荷理论预报模型,并确定Morison公式中惯性力和拖曳力系数的选取方法。研究表明,雷诺数、Keulegan-Carpenter数(KC数)和上层深度对Morison公式中的惯性力和拖曳力系数的取值有显著影响。立柱群的拖曳力系数与雷诺数之间呈指数函数关系,而惯性力系数与KC数之间呈幂函数关系。同时,基于所建立的理论预报模型所获半潜平台内孤立波载荷计算结果与系列试验结果吻合良好。 展开更多
关键词 半潜平台 内孤立波(isw) 模型试验 Morison公式 系数
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FPSO内孤立波载荷实验观测及理论预报模型研究 被引量:1
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作者 张瑞瑞 陈科 +1 位作者 尤云祥 季梦 《船舶力学》 EI CSCD 北大核心 2021年第6期704-715,共12页
利用大型密度分层水槽开展了下凹型内孤立波作用在FPSO上的载荷特性系列实验;并依据实验工况,考虑KdV、eKdV和MCC内孤立波理论的适用性条件,数值研究了FPSO内孤立波载荷成分构成;基于实验结果和载荷成分构成,建立了FPSO内孤立波载荷的... 利用大型密度分层水槽开展了下凹型内孤立波作用在FPSO上的载荷特性系列实验;并依据实验工况,考虑KdV、eKdV和MCC内孤立波理论的适用性条件,数值研究了FPSO内孤立波载荷成分构成;基于实验结果和载荷成分构成,建立了FPSO内孤立波载荷的理论预报模型。研究表明:FPSO内孤立波水平载荷由粘性力和Froude-Krylov力组成,而垂向载荷主要为垂向Froude-Krylov力;Froude-Krylov力可通过动压力沿FPSO浮体湿表面积分得到,粘性力则通过经实验回归的摩擦系数C_(f)、形状修正因数K乘以内孤立波诱导水质点切向速度沿FPSO浮体湿表面积分得到。系列实验结果得出:摩擦系数C_(f)和形状修正因数K与雷诺数Re、KC数和流体层深度比h_(1)/h有关;摩擦系数与Re呈自然对数关系;而形状修正因数K与KC数呈幂函数关系。理论预报模型预报的水平载荷、垂向载荷结果均与系列实验和数值结果吻合较好,并且发现随着内孤立波振幅的增加,载荷幅值近乎线性增加,而且上层流体深度对水平力幅值有明显的影响。 展开更多
关键词 内孤立波(isw) FPSO 波浪载荷 载荷实验 摩擦系数和修正因数
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弱非线性内孤立波在斜坡上的传播演化特性 被引量:2
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作者 郅长红 陈科 尤云祥 《上海交通大学学报》 EI CAS CSCD 北大核心 2021年第8期916-923,共8页
采用简化的变系数内孤立波传播方程来描述弱非线性内孤立波在不同坡度斜坡上的传播演化过程.结果表明:弱非线性内孤立波在通过斜坡的传播过程中产生了不同程度的分裂现象,分裂为首波和尾波列.在通过斜坡的传播过程中内孤立波主要受到由... 采用简化的变系数内孤立波传播方程来描述弱非线性内孤立波在不同坡度斜坡上的传播演化过程.结果表明:弱非线性内孤立波在通过斜坡的传播过程中产生了不同程度的分裂现象,分裂为首波和尾波列.在通过斜坡的传播过程中内孤立波主要受到由地形诱导产生的浅化效应和能量耗散作用.对于非线性较弱的内孤立波,地形导致的浅化效应占主导作用,振幅逐渐增大并趋于稳定,而波速逐渐减小并趋于稳定.在相同的地形条件下,随着初始振幅增大,振幅的增加量减小,波速的减小量增加.随着斜坡坡度的增大,非线性内孤立波在传播过程中受到的能量耗散作用逐渐大于浅化效应,使得内孤立波在传播过程中振幅先增大后减小.当经过临界点(上下层流体深度相同的点)后,内孤立波由下凹型转变为上凸型. 展开更多
关键词 内孤立波 两层流体 变系数内孤立波传播方程 斜坡地形 浅化作用
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