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Journal of Ocean University of China 2024年第3期23卷 721-730页

作者： LI Anlong WANG Panpan GUO Xijun JI Xiangkun SHEN Kunming LIN Lin YAN Zhichao YUAN Lin Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education and College of Marine GeosciencesOcean University of ChinaQingdao 266100China College of Marine Geoscience Ocean University of ChinaQingdao 266100China China construction Second Engineering Bureau Co. LTDYueyang 414000China Tianjin Research Institute for Water Transport Engineering M.O.T.Tianjin 3000456China lianyungang Xuwei port Holding Group Co. Ltd.Lianyungang 222042China

The comprehension of sediment grain size parameters and the corresponding sedimentary environment holds paramount importance in elucidating the engineering geological attributes of the subaqueous *** study delineated the sedimentary environment zoning in the northern sea area of Qingdao through cluster analysis of grain size parameters derived from 123 surface sediment *** study analyzed the correlation between sediment geotechnical indices and grain size parameters across diverse sedimentary environments.A correlation equation was established for samples exhibiting a strong *** study found four distinct sedimentary environments in the study area:coastal,transitional,shallow sea,and *** the same sedimentary environment,the average grain size and sorting coefficient exhibit significant correlations with geotechnical indices such as water content,density,shear strength,plastic limit,liquid limit,and plastic ***,notable disparities in the correlation between grain size parameters and geotechnical indices emerge across different sedimentary environments.

关键词： grain size parameters cluster analysis sedimentary environment correlations geotechnical indexes

Smart contract applications in the built environment: How prepared are Nigerian construction stakeholders?

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Frontiers of Engineering Management 2024年第1期11卷 50-61页

作者： Andrew EBEKOZIEN Clinton AIGBAVBOA Samuel Adeniyi ADEKUNLE Mohamad Shaharudin SAMSURIJAN John ALIU Bernard Martins ARTHUR-AIDOO Godpower Chinyeru AMADI Department of construction Management and Quantity Surveying University of JohannesburgJohannesburg 2006South Africa School of Social Sciences Universiti Sains MalaysiaGelugor11800 USM PenangMalaysia Department of Quantity Surveying Auchi PolytechnicAuchiNigeria Institute for Resilient Infrastructure Systems College of EngineeringUniversity of GeorgiaAthensGA 30602USA Department of Building Technology Faculty of Built EnvironmentAccra Technical UniversityAccraGhana Nigerian Institute of Management Port HarcourtNigeria

Studies have demonstrated that advanced technology,such as smart contract applications,can enhance both pre-and post-contract administration within the built environment *** contract technology,exemplifying blockchain technologies,has the potential to improve transparency,trust,and the security of data transactions within this ***,there is a dearth of academic literature concerning smart contract applications within the construction industries of developing countries,with a specific focus on ***,this study seeks to explore the relevance of smart contract technology and address the challenges impeding its adoption,offering strategies to mitigate the obstacles faced by smart contract *** investigate the stakeholders,this research conducted 14 virtual interview sessions to achieve data *** interviewees encompassed project management practitioners,senior management personnel from construction companies,experts in construction dispute resolution,professionals in construction software,and representatives from government construction *** data obtained from these interviews underwent thorough analysis employing a thematic *** study duly recognizes the significance of smart contract applications within the *** the 12 identified barriers,issues such as identity theft and data leakage,communication and synchronization challenges,high computational expenses,lack of driving impetus,excessive electricity consumption,intricate implementation processes,absence of a universally applicable legal framework,and the lack of a localized legal framework were recurrent impediments affecting the adoption of smart contract applications within the *** study also delves into comprehensive measures to mitigate these *** conclusion,this study critically evaluates the relevance of smart contract applications within the built environment,with a specific focus on promoting their *** may serve

关键词： built environment industry digitalization Nigeria smart contract technological revolution

Contributors to tidal duration asymmetry with varied coastline configurations on western shelf of Yellow Sea

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Water Science and Engineering 2024年第1期17卷 1-12页

作者： Xi Feng Zheng Li Hui Feng Jia-yan Yang Shou-peng Xie Wei-bing Feng College of Harbor.Coastal and Offshore Engineering Hohai UniversityNanjing 210098China China Harbour Engineering Co. LtdBeijing 100027China Key Laboratory of port Waterway and Sedimentation Engineering of the Ministry of CommunicationsNanjing 210029China China South-to-North Water Diversion Corporation Limited Beijing 100036China

Coastal management in China is confronted with an urgent choice between natural restoration and maintenance of existing seawalls and reclaimed land for economic development.A key criterion for making this decision is the resilience to coastal flooding,which depends on the ability to predict tidal *** duration asymmetry(TDA)is a key parameter in determination of the arrival and duration of flood *** study selected the western inner shelf of the Yellow Sea(WYS)as the study area and investigated the responses of TDA to different shoreline configurations and relative sea level *** responses of TDA to shoreline reconstruction yielded spatial variability locally and *** the nearshore area,the responses of TDA to the complex ocean environment mainly originated from the combined functions of reflection,bottom friction,and advection,which controlled the energy transfer from M2 or S2 constituents to their overtides or compound *** sensitivity of TDA to coastline typologies was not limited to coastal waters but could stretch over the entire inner *** vulnerability of tidal responses was due to the displacement of the M2 amphidrome of the Kelvin wave on the WYS,which in turn changed tidal energy fluxes over the *** relative sea level rise could intensify the feedback of TDA to seawalls and land reclamation.

关键词： Tidal duration asymmetry Western inner shelf of Yellow Sea Natural restoration Relative sea level rise Tidal amphidrome

A　model　of　profile　evolution　on　wave-dominated　mud　coast

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Acta Oceanologica Sinica 1997年第3期16卷 369-385页

作者： Zhang Y. Yu Z. Jin L. State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China headquarters of lianyun port construction

Ａｍｏｄｅｌｏｆｐｒｏｆｉｌｅｅｖｏｌｕｔｉｏｎｏｎｗａｖｅ－ｄｏｍｉｎａｔｅｄｍｕｄｃｏａｓｔＺｈａｎｇＹｏｎｇ，ＹｕＺｈｉｙｉｎｇａｎｄＪｉｎＬｉｕ（ＲｅｃｅｉｖｅｄＪｕｌｙ２３，１９９６；ａｃｃｅｐｔｅｄＯｃｔ... 详细信息

Ａｍｏｄｅｌｏｆｐｒｏｆｉｌｅｅｖｏｌｕｔｉｏｎｏｎｗａｖｅ－ｄｏｍｉｎａｔｅｄｍｕｄｃｏａｓｔＺｈａｎｇＹｏｎｇ，ＹｕＺｈｉｙｉｎｇａｎｄＪｉｎＬｉｕ（ＲｅｃｅｉｖｅｄＪｕｌｙ２３，１９９６；ａｃｃｅｐｔｅｄＯｃｔｏｂｅｒ．．８，１９９６）Ａｂｓｔ...

关键词： wave-dominated evolution coast model mud

Experimental Study on the Wavelengths of Two-Dimensional and Three-Dimensional Freak Waves

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China Ocean Engineering 2023年第1期37卷 154-164页

作者： CUI Cheng PAN Wen-bo National Engineering Research Center for port Hydraulic construction Technology M.O.T.Tianjin Research Institute of Water Transport EngineeringTianjin 300456China

Freak waves are commonly characterized by strong-nonlinearity, and the wave steepness, which is calculated from the wavelength, is a measure of the degree of the wave nonlinearity. Moreover, the wavelength can describe the locally spatial characteristics of freak waves. Generally, the wavelengths of freak waves are estimated from the dispersion relations of Stokes waves. This paper concerns whether this approach enables a consistent estimate of the wavelength of freak waves. The two-(unidirectional, long-crested) and three-dimensional(multidirectional, shortcrested) freak waves are simulated experimentally through the dispersive and directional focusing of component waves, and the wavelengths obtained from the surface elevations measured by the wave gauge array are compared with the results from the linear, 3rd-order and 5th-order Stokes wave theories. The comparison results suggest that the 3rd-order theory estimates the wavelengths of freak waves with higher accuracy than the linear and 5th-order theories. Furthermore, the results allow insights into the dominant factors. It is particularly noteworthy that the accuracy is likely to depend on the wave period, and that the wavelengths of longer period freak waves are overestimated but the wavelengths are underestimated for shorter period ones. In order to decrease the deviation, a modified formulation is presented to predict the wavelengths of two-and three-dimensional freak waves more accurately than the 3rd-order dispersion relation, by regression analysis. The normalized differences between the predicted and experimental results are over 50% smaller for the modified model suggested in this study compared with the 3rd-order dispersion relation.

关键词： freak wave rogue wave wavelength three-dimension directional spread multidirectional wave

CONSIDERATION OF HYDRODYNAMIC CHARACTERISTICS,SEDIMENTS & ENVIRONMENTAL PROBLEMS OF MUDDY COAST IN THE construction OF lianyunGANG HARBOUR

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Chinese Journal of Oceanology and Limnology 1994年第2期12卷 97-105页

作者：虞志英金■ 张庆曙 Institute of Estuarine and Coastal Research East China Normal University Shanghai headquarters of lianyungang port construction Lianyungang

After nearly 20 years of construction,we have successfully solved a series of hydrologic sedimentaryand environment problems encountered during the construction of the big deep water harbour inlianyungang which can now accommodate ships of 50000 *** the economic development,the channel of 50000 tonnage will be built soon, and of 100000 tonnage is under planning. Theconstruction of the international container shipping hub at the harbour is being accelerated in anticipationof the opening of the second Eurasian land *** future development of the harbour will givegreat impetus to the local economy of lianyungang City and make it an international city.

关键词： lianyungang Harbour muddy coast hydrodynamic sediments environment

基于实际预压载作业的自升式平台环境载荷图谱绘制新思路

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哈尔滨工程大学学报（英文版） 2024年第1期23卷 209-221页

作者：孙承猛林海花张志刚孙洪源周立师 Naval Architecture and port Engineering College Shandong Jiao Tong UniversityWeihai 264209China School of Ocean Engineering Harbin Institute of TechnologyWeihai 264209China China Merchants Jinling Shipyard(Weihai)Co. Ltd.Weihai 264207China

The environmental load chart is an important technical support required for the jack-up drilling platform to facilitate its adaptation to different operating waters and ensure the safety of *** chart is a crucial part of the platform operation *** chart data are closely related to external factors such as water depth,wind,wave,and current conditions of the working water,as well as to the structural characteristics of the platform itself and the number of variable *** study examines the platform state under extreme wind,wave,and current conditions during *** addition,this study focuses on the difference between the ultimate reaction force of the pile leg during preloading and the reaction force of the pile leg without considering any environmental load before ***,the relationship between the difference and the new reaction force of the pile leg caused by the combination of different environmental conditions is established to facilitate the construction of a new form of environmental load *** newly formed chart is flexible and simple;thus,it can be used to evaluate the environmental adaptability of the platform in the target well location and provides the preloading target demand or variable load limit according to the given environmental ***,the platform can perform personalized preloading operations,thereby improving its capability to cope with complex geological conditions,such as reducing punch-through *** condition reduces the load on jacking system devices and increases its service life.

关键词： Jack-up Environmental load chart Preloading Geometrically nonlinear effect Punch through

THE HYDRODYNAMICAL CHARACTERISTICS OF NEARSHORE WATERS AND THE DISCHARGING PROCESS OF MUD FLATS——A CASE STUDY OF. THE MUD FLATS NEAR lianyunGANG, CHINA

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Chinese Journal of Oceanology and Limnology 1987年第2期5卷 97-108页

作者：虞志英张勇陈德昌金镠 Institute of Estuarine and Coastal Research East China Normal University Shanghai headquarters of port construction lianyungang

It is apparent that there is a difference between mud coasts and sand coasts in such aspects as sediment components, hydrodynamics of nearshore waters, and the formative process in configuration, and profile. The intensity distribution of waves affecting the mud flats in lianyungang, and the conditions determining tidal water levels, are discussed in this paper. A mathematical model which describes the erosion process of mud flats has been derived on the basis of the results of tests for the mud process in seawater. The model is satisfactory for the actual mud flat profile change in lianyungang with artificial mud discharges.

关键词： THE MUD FLATS NEAR lianyunGANG A CASE STUDY OF CHINA THE HYDRODYNAMICAL CHARACTERISTICS OF NEARSHORE WATERS AND THE DISCHARGING PROCESS OF MUD FLATS

Experimental Study on Stability of Breakwaters with Penetrating Box Foundations

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海洋工程：英文版 2003年第1期17卷 71-82页

作者：别社安李伟李增志任增金及春宁 Department of port and Coastal Engineering Planning and construction Department

The breakwater with top sealed, shallow and wide penetrating box foundations is a new type of structure, applicable to deep water and soft seabed. The relations of horizontal and vertical bearing capacities of the box foundation structure as well as the instability induced failure modes to its dimensions and external loads are discussed through static model tests and wave tests. The mechanical properties of the stability of the box foundation are similar to those of embedded rigid foundations, i.e. the vertical stresses at the bottom of the box are distributed in a linear pattern under the action of vertical loads, and passive and active soil pressures are developed at the front and back sides of the box under the action of horizontal loads; there are two instability induced failure modes of the foundation structure-horizontal slide along the box base and tilting due to insufficient local vertical bearing capacity of the soil beneath the box base. The stability of box foundations can be analyzed by use of the methods applied to analysis of the embedded rigid foundations. To increase the width of the box is the most effective way to improve the stability of box foundations.

关键词： penetrating box foundation breakwater stability bearing capacity model test

Hydrodynamic Behavior of Gap Resonance in Multiple-Box Systems with Sharp and Round Inlet Configurations

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China Ocean Engineering 2023年第5期37卷 849-862页

作者： RAN Ya-qing JIANG Sheng-chao GENG Bao-lei JIN Rui-jia Faculty of Vehicle Engineering and Mechanics Dalian University of TechnologyDalian 116024China National Engineering Research Center for port Hydraulic construction Tianjin Research Institute for Water Transport EngineeringM.O.T.Tianjin 300456China

Fluid resonance within narrow gaps in multiple-box systems with sharp and round inlet configurations are investigated by using the potential flow and viscous fluid flow models in the OpenFOAM^(■)*** discrepancy between two numerical models can be observed for sharp inlet *** addition to the dramatical decrease of resonant amplitude in narrow gaps,some peak values at the higher resonant frequencies predicted by the potential flow model even disappear in the viscous fluid flow *** decreased normalized resonant amplitudes with the increase of incident wave amplitude can be observed for sharp inlet ***,the hydrodynamic behaviors of multiple-box system with round inlet configurations between potential flow and viscous fluid flow models are quite similar with each *** normalized resonant amplitudes are nearly independent of incident wave amplitudes for multiple-box systems with round inlet *** implies that the energy dissipation associated with fluid viscosity and flow rotation plays an important role in the gap resonance for sharp inlet configurations;while it is insignificant for round inlet configurations.

关键词： fluid resonance multiple boxes sharp edge round edge OpenFOAM