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Coastal sea level variability in the Bohai Bay: influence of atmospheric forcing and prediction

Journal of Oceanology and Limnology 2019年第2期37卷 486-497页

作者： Lü Xianqing WANG Daosheng YAN Bing YANG Hua Key laboratory of engineering Sediment of the Ministry of Transport / national engineering laboratory for port hydraulic construction technology Tianjin Research Institute for Water Transport Engineering M.O.T. Tianjin 300456 China Physical Oceanography laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao 266100 China College of Marine Science and technology China University of Geosciences Wuhan 430074 China Shenzhen Research Institute China University of Geosciences Shenzhen 518057 China

The sea level variabilities, especially the atmosphere-driven sea level variabilities, which are diff erent in studies on diverse areas and timescales, need to be further documented in the Bohai Bay. Coastal sea level data and coincident meteorological data collected hourly at two observation stations (E1 and E2) in the Bohai Bay, which is a typical semi-enclosed coastal sea in China, are analyzed for the period from 19 August 2014 to 18 November 2014. The sub-sampled low-pass (<0.8 cpd) sea levels (SLSLs) at E1 and E2 are almost the same as each other, while the winds are not. On the whole, SLSLs at E1 and E2 are dominantly influenced by the across-shore wind;in detail, the dominant wind orientation at E1 is 65° measured clockwise from north, and SLSL at E2 is significantly influenced by the sub-sampled wind (SW) at 55°. Regression of SLSL onto the corresponding SW in dominant orientation and the atmospheric pressure is used to predict SLSL, which make the frequency of occurrences when the predicted total sea level is within 0.15 m from the observed values increase to 66.03% and 58.08% at E1 and E2 from original 36.71% and 34.80% without using it, respectively. The results indicate that for the prediction of the total sea level variability in the coastal shallow waters, the SLSL influenced by the atmospheric forcing, including local wind and atmospheric pressure, can be predicted using the multivariable linear regression model.

关键词： coastal sea level atmospheric forcing Bohai Bay prediction

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Numerical simulation of the separation between concrete face slabs and cushion layer of Zipingpu dam during the Wenchuan earthquake

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Science China(Technological Sciences) 2016年第4期59卷 531-539,1-3页

作者： KONG XianJing LIU JingMao ZOU DeGao State Key laboratory of Coastal and Offshore engineering Dalian University of Technology Institute of Earthquake engineering School of Hydraulic Engineering Dalian University of Technology

The Zipingpu concrete-faced rockfill dam(CFRD)experienced strong ground motion from the 2008 Wenchuan *** between concrete face slabs and the cushion layer was observed after the *** separation voids under the stage III slabs make up 55%of the total area of the stage III *** observed maximum height of the separation voids was nearly 23 cm at the top of the stage III *** voids were also observed locally below the top of stage II slabs near the left abutment,with a maximum height of 7 *** this study,a static and dynamic elasto-plastic finite element analysis on Zipingpu CFRD was conducted to capture the separation during the Wenchuan *** rockfill materials were described using a state-dependent elasto-plastic model that considered particle *** model parameters of rockfill materials were obtained from feedback *** numerical results were largely consistent with the field measurements during construction and after the Wenchuan earthquake.A three-dimensional state-dependent elasto-plastic model that can trace the separation and re-contact of a soil-structure interface was employed to investigate the interaction between concrete face slabs and a cushion *** analysis showed the distribution of separation voids observed in the Zipingpu CFRD has a close relationship to the water level and slab dislocations at the time of the *** phenomenon of the separation from the Wenchuan earthquake was successfully captured by the proposed numerical procedure.

关键词： separation Zipingpu Wenchuan earthquake elasto-plastic model interface rockfill feedback analysis

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The Flipping-Free Full-Parallax Tabletop Integral Imaging with Enhanced Viewing Angle Based on Space-Multiplexed Voxel Screen and Compound Lens Array

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Computer Modeling in engineering & Sciences 2023年第9期136卷 3197-3211页

作者： Peiren Wang Jinqiang Bi Zilong Li Xue Han Zhengyang Li Xiaozheng Wang national engineering Research Center of port hydraulic construction technology Tianjin Research Institute forWater Transport EngineeringM.O.T.Tianjin300456China State Key laboratory of Information Photonics&Optical Communications BUPTBeijing100876China Research Department ofWireless Network Huawei TechnologiesShanghai201206China

Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three-dimensional imaging technology,widely used in biomedical imaging and visualization to enhance medical ***,the traditional structural characteristics of integral imaging display inevitably introduce the flipping effect outside the effective viewing ***,a full-parallax tabletop integral imaging display without the flipping effect based on space-multiplexed voxel screen and compound lens array is demonstrated,and two holographic functional screens with different parameters are optically designed and *** eliminate the flipping effect in the reconstruction process,the space-multiplexed voxel screen consisting of a projector array and the holographic functional screen is presented to constrain light beams passing through the corresponding *** greatly promote imaging quality within the viewing area,the aspherical structure of the compound lens is optimized to balance the *** cooperates with the holographic functional screen to modulate the light field spatial *** with the simulation results,the distortion rate of the imaging display is reduced to less than 9%from more than 30%.In the experiment,the floating high-quality reconstructed three-dimensional image without the flipping effect can be observed with the correct 3D perception at 96°×96°viewing angle,where 44,100 viewpoints are employed.

关键词： Integral imaging display flipping effect large viewing angle optimized compound lens imaging distortion

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Safety assessment of waste rock dump built on existing tailings ponds

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Journal of Central South University 2015年第7期22卷 2707-2718页

作者：李全明袁会娜钟茂华 China Academy of Safety Science and technology State Key laboratory of Hydroscience and engineering Department of hydraulic engineering Tsinghua University

The construction of waste rock dumps on existing tailing ponds has been put into practice in China to save precious land resources. This work focuses on the safety assessment of the Daheishan molybdenum mine waste rock dump under construction on two adjoining tailings ponds. The consolidation of the tailings foundation and the filling quality of the waste rock are investigated by the transient electromagnetic method through detecting water-rich areas and loose packing areas, from which, the depth of phreatic line is also estimated. With such information and the material parameters, the numerical method based on shear strength reduction is applied to analyzing the overall stability of the waste rock dump and the tailings ponds over a number of typical cross sections under both current and designed conditions, where the complex geological profiles exposed by site investigation are considered. Through numerical experiments, the influence of soft lenses in the tailings and possible loose packing areas in the waste rock is examined. Although large displacements may develop due to the soft tailings foundation, the results show that the waste rock dump satisfies the safety requirements under both present and designed conditions.

关键词： waste rock dump tailings pond safety assessment transient electromagnetic method stability analysis

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Mechanism of the Impact of Floods and Typhoons on the Morphological Evolution of the Yangtze Estuary

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China Ocean engineering 2023年第3期37卷 447-457页

作者： JIAO Jian DING Lei HAN Yu-fang SUN Jie-ying YANG Xiao-yu HUANG Yu-ming DOU Xi-ping Key laboratory of port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China State Key laboratory of Water Resources engineering and Management Wuhan UniversityWuhan 430072China

In the last two decades,the Yangtze Estuary has undergone significant changes under the influence of reduced sediment inflow and estuary *** study investigates the influence of floods and typhoons on sediment concentration and the morphological evolution of shoals and channels in the Yangtze *** analysis is conducted through the utilization of topographic data measured pre-and post-flood events and observations of hydro-sedimentary changes during *** using a generalized estuary mathematical model,this study examines the interplay between varying tidal ranges,tidal divisions,runoff volumes,and regulation projects on the erosion and deposition of shoals and channels in bifurcated *** results show that due to the implementation of river and waterway regulation projects,the impact of the 2020 flood on the main channel and shoal was significantly less than that of the1998 *** swing amplitude of the South Branch main channel ***,local river sections such as the Southern Waterway of Baimao Shoal exhibited *** typhoons,sediment concentration in the 20 cm above the bottom increased significantly and was closely related to wave processes,with a weakened correlation to tidal *** typhoons,high shoals in South Passage above 0 m were silted up,while the terrain on one side of the tail of Jiuduan Shoal in the downstream deep-water area was generally scoured due to strong wave *** generalized mathematical model of the bifurcated estuary revealed that M2 tidal component contributed most to the ero sion and deposition evolution of estuary shoals and channels,with floods exhibiting characteristics of sedime ntation on shoals and erosion on *** the implementation of a branch rectification project,branch resistance increased,diversion decreased,and the riverbed changed from pre-project erosion to post-project sedimentation,with an increase in erosion in non-project branches.

关键词： the Yangtze Estuary flood typhoon morphological evolution

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Interaction between cracks and effect of microcrack zone on main crack tip

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Applied Mathematics and Mechanics(English Edition) 2010年第1期31卷 67-76页

作者：夏晓舟章青乔丕忠李丽娟 The Faculty of construction Guangdong University of Technology State Key laboratory of Hydrology-Water Resources and hydraulic engineering Hohai University Department of engineering Mechanics Hohai University Department of Civil and Environmental engineering Washington State University

Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when the microcrack is along the direction parallel or perpendicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz （1987）. The mechanism of microcrack generation and the effect of the microcrack zone on the main crack tip are studied. It is concluded that the microcrack zone has effect on the main crack tip, which increases with the increase of microcrack density and length.

关键词： principle of superposition stress intensity factor interaction effect microcrack zone

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Morphodynamic Characteristics and Medium-Term Simulation of the North-South Passage Under the Impact of the Yangtze Estuary Deepwater Navigation Channel Project

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China Ocean engineering 2020年第2期34卷 198-209页

作者： JIAO Jian DOU Xi-ping GAO Xiang-yu DING Lei YANG Xiao-yu Key laboratory of port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China College of Water Conservancy and Hydropower engineering Hohai UniversityNanjing 210098China

The morphological evolution characteristics of the North-South Passage area since the construction of the Yangtze Estuary Deepwater Navigation Channel Project(DNCP)are analyzed on the basis of the measured data.A twodimensional morphodynamics numerical model of the Yangtze Estuary is established to verify the morphological evolution of the North-South Passage under the influence of the DNCP and to predict the future evolution in the next 40 *** analysis shows that the North Passage has experienced rapid adjustment stages and adaptive stages after the construction of the *** erosion occurred along the main channel,and slow siltation could be observed in the area between the *** South Passage showed a state of upper section erosion and down section *** present,the whole South Passage is in a slight erosion *** to the numerical model,the eroding and silting speed of the North Passage will slow down in the *** present state that erosion occurs in the main channel and siltation occurs between the groins will *** South Passage will still maintain upper section erosion and down section deposition in the *** to the main channel erosion of the North Passage and siltation of the South Passage,the sediment division ratio of the North Passage will increase in the future but still be smaller than 50%.After morphological evolution of 40 years,the direction of residual sediment transport caused by M2 and M4 tidal components in the North Passage has not changed,but the transport rate will *** is considered that the morphological evolution of the North-South Passage could reach a relatively stable state after 40 years.

关键词： Yangtze Estuary numerical model morphology tidal current sediment transport deepwater navigation channel project(DNCP)

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Experimental Investigation of Local Scour Around A New Pile-Group Foundation for Offshore Wind Turbines in Bi-Directional Current

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China Ocean engineering 2018年第6期32卷 737-745页

作者： JI Chao ZHANG Jin-feng ZHANG Qing-he LI Ming-xing CHEN Tong-qing State Key laboratory of hydraulic engineering Simulation and Safety Tianjin University Fourth Harbor engineering Investigation and Design Institute Co. Ltd. China Communications Construction Company

The local scour around a new pile-group foundation of offshore wind turbine subjected to a bi-directional current was physically modeled with a bi-directional flow flume. In a series of experiments, the flow velocity and topography of the seabed were measured based on a system composed of plane positioning equipment and an *** results indicate that the development of the scour hole was fast at the beginning, but then the scour rate decreased until reaching equilibrium. Erosion would occur around each pile of the foundation. In most cases, the scour pits were connected in pairs and the outside widths of the scour holes were larger than the inner widths. The maximum scour depth occurred at the side pile of the foundation for each test. In addition, a preliminary investigation shows that the larger the flow velocity, the larger the scour hole dimensions but the shorter equilibrium time. The field maximum scour depth around the foundation was obtained based on the physical experiments with the geometric length scales of 1:27.0, 1:42.5 and 1:68.0, and it agrees with the scour depth estimated by the HEC-18 equation.

关键词： offshore wind turbines new pile-group foundation local scour bi-directional current

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Wave Scattering by Twin Surface-Piercing Plates Over A Stepped Bottom:Trapped Wave Energy and Energy Loss

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China Ocean engineering 2019年第4期33卷 398-411页

作者： DENG Zheng-zhi WANG Chen WANG Chi YAO Yu OU Ze-ting WANG Li-xian Institute of port Coastal and Offshore Engineering Zhejiang University Zhoushan 316021 China Nanjing hydraulic Research Institute Nanjing 210029 China School of hydraulic engineering Changsha University of Science and Technology Changsha 410114 China Departments of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology Wuhan 430063 China

To evaluate the trapped wave energy and energy loss, the problem of wave scattering by twin fixed vertical surface- piercing plates over a stepped bottom is numerically simulated using the open source package OpenFOAM and the associated toolbox waves2Foam. The volume of fluid (VOF) method was employed to capture the free surface in the time domain. The validation of the present numerical model was performed by comparing with both the analytical and experimental results. The effects of the spacing between two plates and the configuration of stepped bottom on the hydrodynamic characteristics, such as reflection and transmission coefficients, viscous dissipation ratio, and relative wave height between the plates (termed as trapped wave energy), were examined. Moreover, the nonlinear effects of the incident wave height on the hydrodynamic characteristics were addressed as well. The results show that the step configuration can be tuned for efficient-performance of wave damping, and the optimum configurations of the step length B, the step height h1 and the spacing b, separately equaling λ/4, 3h/4, and 0.05h (λ and h are the wavelength and the water depth, respectively), are recommended for the trapping of wave energy.

关键词： OpenFOAM twin surface-piercing plates viscous dissipation wave nonlinearity trapped wave energy

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Influence of impulse waves generated by rocky landslides on the pressure exerted on bank slopes

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Journal of Mountain Science 2021年第5期18卷 1159-1176页

作者： CAO Ting WANG Ping-yi QIU Zhen-feng REN Jing-xuan Key laboratory of hydraulic and Waterway engineering of Ministry of Education Chongqing Jiaotong UniversityChongqing 400074China engineering Research Center of Diagnosis technology and Instruments of Hydro-construction Chongqing Jiaotong UniversityChongqing 400074China

Rocky landslides on river banks can result in the generation of ultra-high waves,which may destroy structures on the opposite *** methods to calculate the pressure on bank slopes under the effect of impulse waves generated by landslides are,however,few and of low ***,in this study,a three-dimensional physical model test was conducted by taking into account factors such as landslide geometry parameters and the bank slope *** model test section was generalized on the basis of a certain section of the Three Gorges reservoir area as a prototype,after which the wave parameters and wave pressure acting on the bank slope were ***,the magnitude,acting point,and distribution of the pressure of the impulse waves generated by the rocky landslide upon the bank slope were *** distribution curve of the impact pressure was similar to that calculated using theСНиПⅡ57-75 formula,and the experimental pulsating pressure value was close to the value calculated using the Subgrade *** on the test results,a power function of the relative pulsating pressure steepness with respect to the reciprocal of the wave steepness,relative water depth,and slope ratio was *** acting point of the maximum pulsating pressure was found to be located near the still water ***,an empirical formula for calculating the envelope of the maximum pulsating pressure distribution curve was *** formulas can serve as a theoretical basis for the prediction of impulse wave pressure generated owing to landslides on bank slopes.

关键词： Rocky landslide Impact pressure Pulsating pressure Wave pressure steepness Distribution curve

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