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摩洛哥大西洋沿岸的波能评估 预览
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作者 Hafsa Bouhrim Abdellatif El Marjani 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期142-152,共11页
The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy conv... The aim of the present work is to assess the offshore wave energy potential along the Atlantic coast of Morocco.Research works of this paper focus on the identification of the most energetic sites for wave energy converters(WECs)deployment.For this purpose,11 sites have been explored;all of them are located at more than 40m depth on the Moroccan Atlantic coast.The wave power at each site is computed on the basis of wave data records in terms of significant wave height and energy period provided by theWaveWatch three(WW3)model.Results indicate that the coast sites located between latitudes 30°30′N and 33°N are the most energetic with an annual average wave power estimated at about 30 kW?m^-1,whereas,in the other sites,the wave power is significantly lower.Moreover,the study of the monthly and seasonal temporal variability is found to be uniform in the powerful sites with values four times greater in winter than in summer.The directional investigation on the significant wave height has shown that for almost all the powerful sites,the incoming waves have a dominant sector ranging between Northern(N)and Western-Northern-Western(WNW)directions. 展开更多
关键词 WAVE ENERGY MOROCCAN ATLANTIC coast WAVE ENERGY converter(WEC) WAVE Watch 3(WW3) Seasonal and temporal variability Directional WAVE height investigation Power ROSES Occurrence BIVARIATE distributions
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Wave prediction in a port using a fully nonlinear Boussinesq wave model 预览
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作者 Young-Kwang Choi Seung-Nam Seo +2 位作者 Jin-Yong Choi Fengyan Shi Kwang-Soon Park 《海洋学报:英文版》 SCIE CAS CSCD 2019年第7期36-47,共12页
A wave forecasting system using FUNWAVE-TVD which is based on the fully nonlinear Boussinesq equations by Chen(2006)was developed to provide an accurate wave prediction in the Port of Busan,South Korea.This system is ... A wave forecasting system using FUNWAVE-TVD which is based on the fully nonlinear Boussinesq equations by Chen(2006)was developed to provide an accurate wave prediction in the Port of Busan,South Korea.This system is linked to the Korea Operational Oceanographic System(KOOS)developed by Park et al.(2015).The computational domain covers a region of 9.6 km×7.0 km with a grid size of 2 m in both directions,which is sufficient to resolve short waves and dominant sea states.The total number of grid points exceeds 16 millions,making the model computational expensive.To provide real-time forecasting,an interpolation method,which is based on pre-calculated results of FUNWAVE-TVD and SWAN forecasting results at the FUNWAVE-TVD offshore boundary,was used.A total of 45 cases were pre-calculated,which took 71 days on 924 computational cores of a Linux cluster system.Wind wave generation and propagation from the deep water were computed using the SWAN in KOOS.SWAN results provided a boundary condition for the FUNWAVE-TVD forecasting system.To verify the model,wave observations were conducted at three locations inside the port in a time period of more than 7 months.A model/model comparison between FUNWAVE-TVD and SWAN was also carried out.It is found that,FUNWAVE-TVD improves the forecasting results significantly compared to SWAN which underestimates wave heights in sheltered areas due to incorrect physical mechanism of wave diffraction,as well as large wave heights caused by wave reflections inside the port. 展开更多
关键词 real-time WAVE forecasting FUNWAVE-TVD SWAN KOOS WAVE observations WAVE DIFFRACTION
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Wave packet solutions in a bounded equatorial ocean and its interannual and decadal variabilities 预览
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作者 Dongling Zhang Juan Zhu +1 位作者 Xu Lu Ming Zhang 《海洋学报:英文版》 SCIE CAS CSCD 2019年第3期45-59,共15页
Linearized shallow water perturbation equations with approximation in an equatorial β plane are used to obtain the analytical solution of wave packet anomalies in the upper bounded equatorial ocean. The main results ... Linearized shallow water perturbation equations with approximation in an equatorial β plane are used to obtain the analytical solution of wave packet anomalies in the upper bounded equatorial ocean. The main results are as follows. The wave packet is a superposition of eastward travelling Kelvin waves and westward travelling Rossby waves with the slowest speed, and satisfies the boundary conditions of eastern and western coasts, respectively.The decay coefficient of this solution to the north and south sides of the equator is inversely proportional only to the phase velocity of Kelvin waves in the upper water. The oscillation frequency of the wave packet, which is also the natural frequency of the ocean, is proportional to its mode number and the phase velocity of Kelvin waves and is inversely proportional to the length of the equatorial ocean in the east-west direction. The flow anomalies of the wave packet of Mode 1 most of the time appear as zonal flows with the same direction. They reach the maximum at the center of the equatorial ocean and decay rapidly away from the equator, manifested as equatorially trapped waves. The flow anomalies of the wave packet of Mode 2 appear as the zonal flows with the same direction most of the time in half of the ocean, and are always 0 at the center of the entire ocean which indicates stagnation, while decaying away from the equator with the same speed as that of Mode 1. The spatial structure and oscillation period of the wave packet solution of Mode 1 and Mode 2 are consistent with the changing periods of the surface spatial field and time coefficient of the first and second modes of complex empirical orthogonal function(EOF)analysis of flow anomalies in the actual equatorial ocean. This indicates that the solution does exist in the real ocean, and that El Ni?o-Southern Oscillation(ENSO) and Indian Ocean dipole(IOD) are both related to Mode 2.After considering the Indonesian throughflow, we can obtain the length of bounded equatorial ocean by taking the sum of that of the t 展开更多
关键词 BOUNDED EQUATORIAL OCEAN WAVE packet SOLUTIONS DECADAL variability Kelvin WAVE Rossby WAVE
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Influences of bubble size distribution on propagation of acoustic waves in dilute polydisperse bubbly liquids 预览
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作者 Yu-ning Zhang Zi-biao Jiang +4 位作者 Jin Yuan Ting Chen Yu-ning Zhang1 Ning-ning Tang Xiao-ze Du 《水动力学研究与进展:英文版》 SCIE EI CSCD 2019年第1期50-57,共8页
The present paper studies the influences of the bubble size distribution on the propagation of acoustic waves in dilute polydisperse bubbly liquids theoretically.The proposed approach is validated by using available e... The present paper studies the influences of the bubble size distribution on the propagation of acoustic waves in dilute polydisperse bubbly liquids theoretically.The proposed approach is validated by using available experimental data in the literature.It is revealed that the bubble size distribution has impacts on both the wave speed and the wave attenuation.Specifically,the minimum wave speed together with the corresponding frequency could be both significantly affected by the bubble size distribution (e.g.,the standard deviation).Furthermore,the maximum wave attenuation in the frequency response curve is also sensitive to the variations of the bubble size distribution. 展开更多
关键词 Cavitation gas BUBBLES WAVE PROPAGATION WAVE speed WAVE attenuation
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Establishment of Numerical Wave Flume Based on the Second-Order Wave-Maker Theory 预览
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作者 ZHANG Hao-chen LIU Shu-xue +1 位作者 LI Jin-xuan WANG Lei 《中国海洋工程:英文版》 SCIE EI CSCD 2019年第2期160-171,共12页
With growing computational power, the first-order wave-maker theory has become well established and is widely used for numerical wave flumes. However, existing numerical models based on the first-order wave-maker theo... With growing computational power, the first-order wave-maker theory has become well established and is widely used for numerical wave flumes. However, existing numerical models based on the first-order wave-maker theory lose accuracy as nonlinear effects become prominent. Because spurious harmonic waves and primary waves have different propagation velocities, waves simulated by using the first-order wave-maker theory have an unstable wave profile. In this paper, a numerical wave flume with a piston-type wave-maker based on the second-order wave-maker theory has been established. Dynamic mesh technique was developed. The boundary treatment for irregular wave simulation was specially dealt with. Comparisons of the free-surface elevations using the first-order and second-order wave-maker theory prove that second-order wave-maker theory can generate stable wave profiles in both the spatial and time domains. Harmonic analysis and spectral analysis were used to prove the superiority of the second-order wave-maker theory from other two aspects. To simulate irregular waves, the numerical flume was improved to solve the problem of the water depth variation due to low-frequency motion of the wave board. In summary, the new numerical flume using the second-order wave-maker theory can guarantee the accuracy of waves by adding an extra motion of the wave board. The boundary treatment method can provide a reference for the improvement of nonlinear numerical flume. 展开更多
关键词 SECOND-ORDER WAVE generation nonlinear WAVE SPURIOUS HARMONIC WAVE numerical FLUME
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Magnetic Wave Transmission of Drug Effects about the Waves,Generated in the Measurement Set-Up and Used i.e.for Anticancer-Treatments 预览
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作者 Konstantin Meyl 《美中医学:英文版》 2019年第3期134-139,共6页
Longitudinal waves propagating in the direction of the magnetic field represents a special class according to the wave equation.They seem to be ubiquitous in nature,as can be shown by numerous natural phenomena.It is ... Longitudinal waves propagating in the direction of the magnetic field represents a special class according to the wave equation.They seem to be ubiquitous in nature,as can be shown by numerous natural phenomena.It is therefore possible that biological systems may use these waves as a medium or as a carrier wave for signal transfer.As longitudinal waves can also be generated technically,an experimental set up has been established in order to show that the wave is able to transfer biological signals effectively apart from any chemical contact.The schematic diagram of the transmitter is explained,the special properties of the magnetic wave,working at 6.78 MHz,as well as the biological antennas,acting as a receiver,are in the focus of the first part of the presentation.It will be referred,how a medical doctor in Spain is using the system for anticancer treatment i.e.,to encourage discussions on medical purposes. 展开更多
关键词 Biological signal transmission information transfer WAVE equation MAGNETIC WAVE carrier WAVE
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珠江口附近海域波浪场的数值计算与特征分析
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作者 邱文博 张永合 +1 位作者 胡轶群 李冠宇 《海洋湖沼通报》 CSCD 北大核心 2019年第4期14-21,共8页
本文以WRF模式输出结果作为风场驱动条件,采用SWAN和WAVEWATCHIII相嵌套的方法,对珠江口附近海域进行20年(1991-2010年)的波浪场数值计算。根据计算结果,分析了珠江口海域波高和周期的空间、时间变化特征。结果显示:珠江入海口及近岸Hs... 本文以WRF模式输出结果作为风场驱动条件,采用SWAN和WAVEWATCHIII相嵌套的方法,对珠江口附近海域进行20年(1991-2010年)的波浪场数值计算。根据计算结果,分析了珠江口海域波高和周期的空间、时间变化特征。结果显示:珠江入海口及近岸Hs较小,外海Hs较大,大部分海域年均Hs在0.4m以上;珠江口附近海域和近海地区年均Te偏小,在2s~3s之间,外海最大可达5s。珠江海域有效波高(Hs)的季节分布呈现出春夏季较小,秋冬季较大的特点。从概率学角度分别统计20年中前5%和10%的Hs及Te,可知:珠江口近海区域Hs,5%在1~2m,大万山群岛处可达Hs,5%2m;在珠江口附近Hs,10%为1.5m,万山海域Hs,10%在2.5m以上;计算海域Te,5%和Te,10%多在4s以上。 展开更多
关键词 珠江口海域 波浪 波周期 SWAN WAVEWATCHⅢ
Study on Energy Spectrum Instability in the Processes of Propagating and Breaking of Focusing Waves 预览
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作者 ZHANG Yi-hui LIANG Shu-xiu SUN Zhao-chen 《中国海洋工程:英文版》 SCIE EI CSCD 2019年第1期86-93,共8页
Based on phase focusing theory,focusing waves with different spectral types and breaking severities were generated in a wave flume.The time series of surface elevation fluctuation along the flume were obtained by util... Based on phase focusing theory,focusing waves with different spectral types and breaking severities were generated in a wave flume.The time series of surface elevation fluctuation along the flume were obtained by utilizing 22 wave probes mounted along the mid-stream of the flume.Based on the wave spectrum obtained using fast Fourier transform(FFT),the instability characteristics of the energy spectrum were reported in this paper.By analyzing the variation of total spectral energy,the total spectral energy after wave breaking was found to clearly decrease,and the loss value and ratio gradually increased and tended to stabilize with the enhancement of breaking severity for different spectral types.When wave breaking occurred,the energy loss was primarily in a high-frequency range of f/fp >1.0,and energy gain was primarily in a low-frequency range of f/fp<1.0.As the breaking severity increased,the energy gain-loss ratio decreased gradually,which demonstrates that the energy was mostly dissipated.For plunging waves,the energy gain-loss ratio reached 24%for the constant wave steepness(CWS)spectrum,and was slightly larger at approximately 30%for the constant wave amplitude(CWA)spectrum,and was the largest at approximately 42%for the Pierson-Moskowitz(PM)spectrum. 展开更多
关键词 phase FOCUSING WAVE BREAKING WAVE surface WAVE steepness
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Qualitative Description of Swashing Motion States on Mild Beach Slope 预览
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作者 YIN Jing ZOU Zhi-li +1 位作者 FANG Ke-zhao LIU Yan-li 《中国海洋工程:英文版》 SCIE EI CSCD 2019年第4期412-423,共12页
The swashing motion on mild beach slope is dominated by the motion of low frequency waves (LFWs). Companying such a motion, there are two types of swashing motion states, occurrence or no occurrence of LFW’s collisio... The swashing motion on mild beach slope is dominated by the motion of low frequency waves (LFWs). Companying such a motion, there are two types of swashing motion states, occurrence or no occurrence of LFW’s collision. The present study distinguishes the two states qualitatively by relating it to the number of generated LFWs for the case of two incident wave groups. A simplified swashing index is established theoretically for this purpose. A series of related experiments were performed to observe the generated out-going LFWs on different mild slope from 1:20 to 1:160 and to determine the critical value of the swashing index. Numerical simulations based on higher order Boussinesq equations are also performed to help the recognition of the LFWs generated in the experiment. 展开更多
关键词 swashing SURF BEAT BRAKING WAVE low frequency WAVE WAVE GROUPS
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Experimental investigation on the optical remote sensing images of internal solitary waves with a smooth surface 预览
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作者 Yuan Mei Jing Wang +2 位作者 Songsong Huang Haidi Mu Xu Chen 《海洋学报:英文版》 SCIE CAS CSCD 2019年第6期124-131,共8页
The parameter inversion of internal solitary waves (ISWs) based on optical remote sensing images is a key work. A new approach is proposed and demonstrated for simulating the optical remote sensing images of ISWs with... The parameter inversion of internal solitary waves (ISWs) based on optical remote sensing images is a key work. A new approach is proposed and demonstrated for simulating the optical remote sensing images of ISWs with a smooth surface in the laboratory. An optical remote sensing simulation system used to detect ISWs is constructed by a two-dimensional ISW flume, a LED (light emitting diode) light source and two CCD (charge coupled device) cameras. The optical remote sensing images of the horizontal surface and ISWs propagation images of a vertical side are detected simultaneously, which aims to explore the response of optical remote sensing corresponding to ISWs with the smooth surface. The results show that during the propagation of ISWs, dark pattern images are obtained by CCD 1 camera. The characteristics of the dark patterns vary along with the incident angle of the light source. The characteristic parameters of the optical remote sensing images correspond to the wave factors of vertical profiles. The experiment also shows a positive correlation between the dark pattern width and the half wave width under different amplitudes of ISWs. The system has the advantages of clear phenomenon and high repeatability, which provides the scientific basis for quantitative investigation on imaging mechanism of ISW by optical remote sensing. 展开更多
关键词 internal SOLITARY WAVE optical remote sensing image DARK pattern HALF WAVE WIDTH WAVE factors
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A 10-year wave energy resource assessment and trends of Indonesia based on satellite observations 预览
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作者 Amiruddin Agustinus Ribal +1 位作者 Khaeruddin Sri Astuti Thamrin 《海洋学报:英文版》 SCIE CAS CSCD 2019年第8期86-93,共8页
Wave energy resource assessment and trends around Indonesian’s ocean has been carried out by means of analyzing satellite observations. Wave energy flux or wave power can be approximated using parameterized sea state... Wave energy resource assessment and trends around Indonesian’s ocean has been carried out by means of analyzing satellite observations. Wave energy flux or wave power can be approximated using parameterized sea states derived from satellite data. Unfortunately, only some surface parameters can be measured from remote sensing satellites, for example for ocean surface waves: significant wave height. Others, like peak wave period and energy period are not available, but can instead be estimated using empirical models. The results have been assessed by meteorological season. The assessment shows clearly where and when the wave power resource is promising around Indonesian’s ocean. The most striking result was found from June to August, in which about 30–40 kW/m(the 90 th percentile: 40–60 kW/m, the 99th percentile: 50–70 kW/m) wave power energy on average has been found around south of the Java Island. The significant trends of wave energy at the 95% level have also been studied and it is found that the trends only occurred for the extreme cases, which is the 99th percentile(i.e.,highest 1%). Wave power energy could increase up to 150 W/m per year. The significant wave heights and wave power have been compared with the results obtained from global wave model hindcast carried out by wave model WAVEWATCH III. The comparisons indicated excellent agreements. 展开更多
关键词 WAVE power energy trends ENVISAT ALTIMETER SIGNIFICANT WAVE HEIGHT WAVE period
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Mechanism of sea ice formation based on comprehensive observation data in Liaodong Bay,China 预览
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作者 SHI Yongfang YANG Yongzeng +2 位作者 TENG Yong SUN Meng YUN Shengjun 《海洋湖沼学报(英文)》 CSCD 2019年第6期1846-1856,共11页
Sea ice disaster is one of the principal natural hazards that affect some coastal areas of China,and the formation of ice cover in a wave field has important characteristics.However,analysis of the mechanism in which ... Sea ice disaster is one of the principal natural hazards that affect some coastal areas of China,and the formation of ice cover in a wave field has important characteristics.However,analysis of the mechanism in which waves affect the thermodynamic process of sea ice is lacking,and the influence of waves is not taken into consideration in numerical models of sea ice,largely because of a lack of simultaneous observations of waves and sea ice.Using observational data of the sea ice cycle in the coastal waters of Liaodong Bay(China),we analyzed the characteristics of hydrology,meteorology,and sea ice thickness during the formation of sea ice,and explored the changes in the interrelationships among heat fluxes,waves,and sea ice under actual sea conditions.The results could provide a decision-making support as a reference to the establishment and improvement of China's early waming system to sea ice disasters,and the protection of ice drilling operations and production platform safety. 展开更多
关键词 wave SEA ICE wave-induced TURBULENCE KINETIC energy
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基于Star-CCM+的摆式波浪能装置水动力性能研究 预览
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作者 元正 张亮 +2 位作者 周斌珍 金鹏 郑雄波 《船舶与海洋工程学报:英文版》 CSCD 2019年第2期153-159,共7页
A two-dimensional numerical Computational Fluid Dynamics(CFD)model is established on the basis of viscous CFD theory to investigate the motion response and power absorption performance of a bottom-hinged flap-type wav... A two-dimensional numerical Computational Fluid Dynamics(CFD)model is established on the basis of viscous CFD theory to investigate the motion response and power absorption performance of a bottom-hinged flap-type wave energy converter(WEC)under regular wave conditions.The convergence study of mesh size and time step is performed to ensure that wave height and motion response are sufficiently accurate.Wave height results reveal that the attenuation of wave height along the wave tank is less than 5%only if the suitable mesh size and time step are selected.The model proposed in this work is verified against published experimental and numerical models.The effects of mechanical damping,wave height,wave frequency,and water depth on the motion response,power generation,and energy conversion efficiency of the flap-type WEC are investigated.The selection of the appropriate mechanical damping of the WEC is crucial for the optimal extraction of wave power.The optimal mechanical damping can be readily predicted by using potential flow theory.It can then be verified by applying CFD numerical results.In addition,the motion response and the energy conversion efficiency of the WEC decrease as the incident wave height increases because the strengthened nonlinear effect of waves intensifies energy loss.Moreover,the energy conversion efficiency of theWEC decreases with increasing water depth and remains constant as the water depth reaches a critical value.Therefore,the selection of the optimal parameters during the design process is necessary to ensure that the WEC exhibits the maximum energy conversion efficiency. 展开更多
关键词 WAVE ENERGY CONVERTER Oyster.Energy conversion efficiency OptimumPTO DAMPING Nonlinear REGULAR WAVE
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Experimental study on inner slope failure mechanism of seawall by coupling effect of storm surge and wave 预览
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作者 PAN Junning WANG Shupeng +2 位作者 SUN Tianting CHEN Maowen WANG Dengting 《海洋湖沼学报(英文)》 CSCD 2019年第6期1912-1920,共9页
In the context of global climate change,the impact of group-occurring ocean dynamic disasters on China's offshore areas is becoming more and more intense.The study of the effect of existing ocean dynamic disasters... In the context of global climate change,the impact of group-occurring ocean dynamic disasters on China's offshore areas is becoming more and more intense.The study of the effect of existing ocean dynamic disasters on offshore hazard-bearing bodies mostly focuses on the effect of single disaster-causing factors,and it is still insufficient to study storm surge and dynamic wave coupling&reinforcement effects as well as the process of the dynamic response of such hazard-bearing bodies as seawalls.This study firstly realized the synchronous process of water level and wave through continuous tide generation and wave generation by the wave maker and tide generating device,so as to realize the dynamic coupling simulation of storm surge and wave in the laboratory.Then the physical model test of the typical seawall section was carried out under the dynamic coupling of storm surge and wave as well as at a conventional fixed water level respectively.In the process of test wave overtopping discharge and the damage process of the levee crown and backwall of seawalls were observed and compared,and their damage mechanism was also studied. 展开更多
关键词 sea DIKE storm surge WAVE OVERTOPPING WAVE LEVEE overflowing coupling
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大型水陆两栖飞机波浪水面着水分析方法 预览
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作者 孙丰 王明振 +1 位作者 褚林塘 张家旭 《航空计算技术》 2019年第4期35-38,共4页
水面环境对水陆两栖飞机着水载荷有重要影响,水面环境分为静水和波浪,采用数值仿真技术对静水面和波浪水面环境下的水陆两栖飞机着水载荷进行计算。利用单机身模型,通过与实验对比,验证仿真方法的有效性及精度;基于推板造波理论实现数... 水面环境对水陆两栖飞机着水载荷有重要影响,水面环境分为静水和波浪,采用数值仿真技术对静水面和波浪水面环境下的水陆两栖飞机着水载荷进行计算。利用单机身模型,通过与实验对比,验证仿真方法的有效性及精度;基于推板造波理论实现数值造波,结合静水面着水仿真技术实现波浪水面着水仿真。研究发现,静水面着水仿真精度较高,应用数值造波方法模拟的波浪品质可以满足工程应用。 展开更多
关键词 水陆两栖飞机 波浪 着水载荷 数值仿真 数值造波
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Rogue waves during Typhoon Trami in the East China Sea 预览
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作者 JIANG Xingjie GUAN Changlong WANG Daolong 《海洋湖沼学报(英文)》 CSCD 2019年第6期1817-1836,共20页
As concluded from physical theory and laboratory experiment,it is widely accepted that nonlinearities of sea state play an important role in the formation of rogue waves;however,the sea states and corresponding nonlin... As concluded from physical theory and laboratory experiment,it is widely accepted that nonlinearities of sea state play an important role in the formation of rogue waves;however,the sea states and corresponding nonlinearities of real-world rogue wave events remain poorly understood.Three rogue waves were recorded by a directional buoy located in the East China Sea during Typhoon Trami in August 2013.This study used the WAVEWATCHⅢmodel to simulate the sea state conditions pertaining to when and where those rogue waves were observed,based on which a comprehensive and full-scale analysis was performed.From the perspectives of wind and wave fields,wave system tracking,High-Order Spectral method simulation,and some characteristic sea state parameters,we concluded that the rogue waves occurred in sea states dominated by second-order nonlinearities.Moreover,third-order modulational instabilities were suppressed in these events because of the developed or fully developed sea state determined by the typhoon wave system.The method adopted in this study can provide comprehensive and full-scale analysis of rogue waves in the real world.The case studied in this paper is not considered unique,and rules could be found and confirmed in relation to other typhoon sea states through the application of our proposed method. 展开更多
关键词 rogue WAVE WAVE system TRACKING HIGH-ORDER SPECTRAL method NONLINEAR effect
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Optimized Numerical Model Based Assessment of Wave Power Potential of Marmara Sea 预览
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作者 ABDOLLAHZADEHMORADI Yasin OZGER Mehmet ALTUNKAYNAK Abdüsselam 《中国海洋大学学报:英文版》 SCIE CAS CSCD 2019年第2期293-304,共12页
Marmara Sea, located between Black Sea and Aegean Sea, is an important sea for ocean engineering activities. In this study, wave power potential of Marmara Sea was investigated using the third generation spectral wind... Marmara Sea, located between Black Sea and Aegean Sea, is an important sea for ocean engineering activities. In this study, wave power potential of Marmara Sea was investigated using the third generation spectral wind-wave model MIKE 21 SW with unstructured mesh. Wind data was obtained from ECMWF ERA-Interim re-analyses wind dataset at 10 m with a spatial resolution of 0.1? for the period of 1994 to 2014. The numerical model was calibrated with measured wave data from a buoy station located in Marmara Sea. Mesh optimization was also performed to obtain the most suitable mesh structure for the study area. This study is the first that dealt with the determination of wave energy potential of Marmara Sea. The numerical model results are presented in terms of monthly, seasonal and annual average of wave power flux(k W m-1). The maximum wave power flux is 1.13 kW m-1 and occurs in November. The overall annual mean wave power flux during 1994–2014 is found to be 0.27 kW m-1 in the offshore regions. 展开更多
关键词 MARMARA Sea MIKE 21 SW WAVE power POTENTIAL ECMWF BUOY WAVE data
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Response of a slender cylindrical member under breaking wave impact 预览
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作者 Manjula R. Sannasiraj S.A 《水动力学研究与进展:英文版》 SCIE EI CSCD 2019年第2期345-357,共13页
A slender cylindrical member is the fundamental component of many coastal and offshore structures.It is essential to understand the action of breaking waves on structural members since,when these members are subjected... A slender cylindrical member is the fundamental component of many coastal and offshore structures.It is essential to understand the action of breaking waves on structural members since,when these members are subjected to wave impact load,the structural damages and failures may be catastrophic.In the present study,an experimental investigation has been carried out to measure the response of the slender vertical cylinder subjected to breaking wave impact.Pressure measurements were made in order to estimate the total force acting on the structure.An empirical relation is established between total impact force and the wave steepness parameter which dictates the intensity of the breaking.Pressure rise time is an important parameter dictating the impact event.Simultaneous acceleration and strain measurements were made to evaluate the response of the cylinder.Deflection has been derived from structure acceleration.The deflection due to the moderate plunging differs by two order more than severe plunging events.Strain rate is another important consideration for the impact loading.The higher strain rate increases the resistance of the material.Under the breaking wave impact on the cylinder,the strain rate varies from 102 to 10-4. 展开更多
关键词 BREAKING WAVE impact ACCELERATION slender vertical CYLINDER WAVE steepness STRAIN rate STRAIN
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结合优先级与时隙分配的认知车联网MAC协议
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作者 尚佳庆 郑国强 +2 位作者 马华红 吴红海 李济顺 《小型微型计算机系统》 CSCD 北大核心 2019年第7期1474-1478,共5页
为了解决基于WAVE的车联网MAC协议存在的用户信息优先级划分不明确及采用固定时隙分配导致安全类信息传递效率低的问题,本文提出一种基于认知无线电技术的车联网MAC协议(CR-WAVE MAC).该协议首先使用增强型分布式信道接入(EDCA)参数调... 为了解决基于WAVE的车联网MAC协议存在的用户信息优先级划分不明确及采用固定时隙分配导致安全类信息传递效率低的问题,本文提出一种基于认知无线电技术的车联网MAC协议(CR-WAVE MAC).该协议首先使用增强型分布式信道接入(EDCA)参数调节策略,引入业务类型和用户数作为EDCA参数调节标准,划分用户信息优先级,然后使用认知无线电频谱感知和分配技术根据信息优先级高低进行动态时隙分配,达到增加安全类信息传输效率的目的.仿真实验结果证明:应用本文提出的车联网CR-WAVE MAC协议显著提高了道路安全类信息的传输投递率和吞吐量,降低了传输时延. 展开更多
关键词 车联网 WAVE 认知无线电 优先级 时隙分配
波浪与潮汐耦合模拟技术研究 预览
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作者 陈茂雯 潘军宁 +2 位作者 王登婷 孙忠滨 孙天霆 《水运工程》 北大核心 2019年第1期29-34,共6页
波浪与潮汐耦合模拟技术相关研究,可为沿海防灾体系建设、灾害评估、预警及应对等提供技术支撑,对预防和减轻沿海台风暴潮和台风浪灾害具有重要的意义。回顾风暴潮和波浪物理模型试验的研究成果,分析波浪与潮汐耦合模拟的最新研究进展... 波浪与潮汐耦合模拟技术相关研究,可为沿海防灾体系建设、灾害评估、预警及应对等提供技术支撑,对预防和减轻沿海台风暴潮和台风浪灾害具有重要的意义。回顾风暴潮和波浪物理模型试验的研究成果,分析波浪与潮汐耦合模拟的最新研究进展和发展趋势,通过将连续的风暴潮水位变化过程与加密离散后的波浪过程进行叠加,用造波机和生潮设备连续生潮造波的方法,在水槽中实现了潮位和波浪的同步变化,从而在实验室中实现波浪与潮汐的耦合模拟,并将之应用于模拟实例。 展开更多
关键词 风暴潮 波浪 越浪 漫堤 耦合
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