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Journal of Palaeogeography 2018年第3期7卷 197-238页

作者： G.Shanmugam Department of Earth and Environmental Sciences The University of Texas at Arlington

Sedimentologic, oceanographic, and hydraulic engineering publications on hyperpycnal flows claim that （1） river flows transform into turbidity currents at plunge points near the shoreline, （2） hyperpycnal flows have the power to erode the seafloor and cause submarine canyons, and, （3） hyperpycnal flows are efficient in transporting sand across the shelf and can deliver sediments into the deep sea for developing submarine fans. Importantly, these claims do have economic implications for the petroleum industry for predicting sandy reservoirs in deep-water petroleum exploration. However, these claims are based strictly on experimental or theoretical basis, without the supporting empirical data from modern depositional systems. Therefore, the primary purpose of this article is to rigorously evaluate the merits of these claims. A global evaluation of density plumes, based on 26 case studies （e.g., Yellow River, Yangtze River, Copper River, Hugli River （Ganges）, Guadalquivir River, Rio de ]a Plata Estuary, Zambezi River, among others）, suggests a complex variability in nature. Real-world examples show that density plumes （1） occur in six different environments （i.e., marine, lacustrine, estuarine, lagoon, bay, and reef）; （2） are composed of six different compositional materials （e.g., siliciclastic, calciclastic, planktonic, etc.）; （3） derive material from 11 different sources （e.g., river flood, tidal estuary, subglacial, etc.）; （4） are subjected to 15 different external controls （e.g., tidal shear fronts, ocean currents, cyclones, tsunamis, etc.）; and, （5） exhibit 24 configurations （e.g., lobate, coalescing, linear, swirly, U-Turn, anastomosing, etc.）. Major problem areas are：（1） There are at least 16 types of hyperpycnal flows （e.g., density flow, underflow, high-density hyperpycnal plume, high-turbid mass flow, tide-modulated hyperpycnal flow, cyclone-induced hyperpycnal turbidity current, multi-layer hyperpycnal flows, etc.）, without an underpinning principle of flu

关键词： Density plumes Facies model Hyperpycnites Submarine fans Tidal shear fronts ocean currents Turbiditycurrents Yellow River Yangtze River

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DYNAMICS OF MEDDIES INTERACTED WITH A SEAMOUNT IN A 1.5 LAYER MODEL

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Journal of Hydrodynamics 2001年第3期13卷 93-99页

作者： Luo, De-Hai Lu, Yan Dept. of Atmosph. and oceanic Sci. Ocean Univ. of Qingdao Qingdao 266003 China

A simplified model is proposed to describe the interaction of meddies with a seamount. In the absence of topography, the meddy obtained in this model moves very slowly to the west. However, in the presence of Gaussian-shaped topography (seamount) the movement of the meddy is strongly controlled by its site. As the seamount is located in the southwest side of a meddy, this meddy will be induced to move southward. But if the seamount is located in the west side of the meddy, the seamount forcing will cause a southwest movement of such a meddy. For two meddies in the absence of seamount, the two meddies will be located on the northwest-southeast axis due to their interaction, which is the natural evolution of two anticyclonic eddies. However, the presence of a seamount will cause the meddies to merge rapidly. This merging is also influenced by the site of the seamount, the closer the seamount is to the two meddies, the faster the two meddies merge. In addition, the direction of the corotating two meddies in the northwest-southeast axis is also influenced by the site of the seamount.

关键词： Equations of motion Hydrodynamics Hydrographic surveys Multilayers Numerical analysis ocean currents

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Dynamic Response Analysis of Risers Subjected to Combined Wave and Current Loading

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China ocean Engineering 1993年第2期8卷 147-156页

作者： Nie, Wu Yu, Xiukun Ma, Chunyan Li, Weiyang Harbin Shipbuilding Engineering Inst Harbin China

A dynamic response analysis in the frequency domain is presented for risers subjected to combined wave and current loading. Considering the effects of current, a modified wave spectrum is adopted to compute the linearized drag force. An additional drag force convolution term is added to the linearized drag force spectrum, therefore the error is reduced which arises from the truncation of higher order terms in the drag force auto-correlation function. An expression of linearized drag force spectrum is given taking the relative velocity into account. It is found that the additional term is a fold convolution integral. In this paper dynamic responses of risers are investigated, while the influence of floater motion on risers is considered. The results demonstrate that the accuracy of the present method reaches the degree required in time domain analysis.

关键词： Drag Dynamic loads Dynamic response Frequency domain analysis Loads (forces) ocean currents Spectrum analysis Time domain analysis Velocity Water waves

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Wave Breaking Phenomena of Irregular Waves Combined with Opposing Current

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China ocean Engineering 1993年第2期8卷 197-206页

作者： Li, Yucheng Dong, Guohai Dalian Univ of Technology Dalian China

Experimental study and theoretical analysis show that the critical value of relative wave height (H / d)b given by Goda and the critical wave steepness (H / L)b given by Michell and Miche can be adopted as the spilling breaking indices of regular waves. According to the same principle, a systematic theoretical analysis and experiment of irregular wave have been done by the authors in order to solve the breaking problem of irregular waves. It is indicated that the authors' method for determining wave breaking of regular waves can also be used for irregular waves.

关键词： Dynamics Fluid structure interaction Geometry Kinetic theory ocean currents Water wave effects Waveform analysis

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Wave-Current Forces on Vertical Cylinders in Side-by-Side Arrangement for Irregular Waves Combined With Opposing Current

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China ocean Engineering 1993年第1期8卷 61-72页

作者： Li, Yucheng Wang, Fenglong Dalian Univ of Technology Dalian China

The wave-current forces on vertical piles in side-by-side arrangement induced by irregular waves with opposing current are investigated experimentally in this paper. The characteristics in both time and frequency domain of in-line, lift and resultant forces are analyzed. The grouping effect coefficients of inline, lift and resultant forces on piles related to KC number and relative spacing parameters are given. These results are compared with those in the case of irregular waves combined with following currents. It is found that the results in these two cases are quite different. The range of KC number tested is 10approx.60, the range of Reynolds number is (0.55approx.3.43) × 104.

关键词： Dynamic loads Fluid structure interaction Frequency domain analysis ocean currents Time domain analysis Water waves

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Wave Transformation and Breaking in Diagonal Opposing Current

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China ocean Engineering 1993年第4期8卷 435-440页

作者： Dong, Guohai Li, Yucheng Dalian Univ of Technology Dalian China

When waves propagate into diagonal opposing current from non-current area, not only the wave parameters but also the direction of wave propagation will change, that is, wave refraction will occur. The authors have calculated the changes of wave parameters, including wave refraction, by Linear Wave Theory, and have also done systematic study on wave transformation and breaking in opposing current by means of experimental analysis and theoretical calculation. In order to know the effect of wave refraction, computation is done in this paper about wave transformation and breaking on gentle slopes in diagonal opposing current.

关键词： Calculations ocean currents oceanography Refraction Refractive index

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Test Study on Current Force on Mooring Ships

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China ocean Engineering 1993年第2期8卷 225-242页

作者： Zhang, Furan Zhao, Jun Zhang, Xueqin Tianjin Research Inst of Water Transport Engineering Tianjin China

In respect of an offshore berthing pillar, the test study result of current force acting on mooring ships is described in this paper. Empirical and semi-empirical relationships of current force coefficient are given according to the angle between the flow direction and the ship's longitudinal axis, which are coincident with the result of theoretical analysis.

关键词： Flow of water Loads (forces) Mathematical models Numerical methods ocean currents Ship models Ships

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Fatigue Sensitivity Analysis of Steel Catenary Riser near Touchdown Point

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Journal of Shanghai Jiaotong university(Science) 2017年第5期22卷 570-576页

作者：王坤鹏嵇春艳薛鸿祥唐文勇 School of Naval Architecture and ocean Engineering Jiangsu University of Science and Technology State Key Laboratory of ocean Engineering Shanghai Jiao Tong University

By transforming the platform response obtained from coupled hydrodynamic analysis to the top motions of steel catenary riser (SCR), the nonlinear dynamic analysis of the SCR is carried out in Abaqus/Aqua. In this analysis, the SCR-seabed interaction is well taken into account by introducing the seabed trench model and hysteretic seabed model. The fatigue damage of the SCR near touchdown point (TDP) is calculated using rain-flow counting methodology, and the sensitivity of the fatigue damage to the seabed and wave parameters are investigated. The results indicate that as seabed stiffness increases, the fatigue life and its sensitivity to seabed stiffness decrease. Seabed trenching may benefit the fatigue life of the SCR and the trench position should be elaborated for realistic fatigue damage prediction. Due to the induced platform response, significant wave height and spectral peak period have significant effects on the fatigue damage, thus the short-term sea state bins should be carefully selected from the wave scatter diagram. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany.

关键词： Fatigue of materials Hysteresis Magnetic disk storage Marine risers ocean currents Overhead lines Sensitivity analysis Stiffness

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Long-Term Evolution of the Black Sea Dynamics Derived from Modeling

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Journal of Shipping and ocean Engineering 2017年第1期7卷 35-42页

作者： Viktor Dorofeyev Larisa Sukhikh Marine Hydrophysical Institute of the Russian Academy of Science

Long-term evolution of the Black Sea dynamics （1980-2020） is reconstructed by means of numerical simulation. The model of the Black Sea circulation is z-coordinate model with 4.8 km horizontal space resolution and 40 levels in vertical direction. Mixing processes in the upper layer are parameterized with the Mellor-Yamada turbulent model. As for the boundary conditions on the sea surface, we used atmospheric forcing functions for the Black Sea region provided by CMCC using regional climate model COSMO-CLM. These data have a spatial resolution of 14km and a daily temporal resolution. To evaluate the quality of the Black Sea circulation dynamics, derived from simulation, the modeling results are compared with results of the Black Sea physical reanalysis. This reanalysis was performed by assimilating the temperature and salinity profiles from hydrographic surveys conducted during 1971-1993.

关键词： Numerical modeling the Black Sea ocean currents seasonal variation.

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白鲸转播北极数据资料

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海外英语 2003年第5期 19-页

作者： Larry O'Hanlon

　　European oceanographers(海洋学者) have found a new way to explore ocean currents under the Arctic ice: they' ve recruited wild beluga whales.……

关键词：白鲸转播北极 ocean currents the Arctic 学者海洋

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