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Fully Coupled Simulation of Interactions Among Waves, Permeable Breakwaters and Seabeds Based on N−S Equations

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China Ocean Engineering 2021年第1期35卷 26-35页

作者： LI Yan-ting WANG Deng-ting SUN tian-ting HUANG Zhe LIU Qing-jun School of Civil Engineering Tianjin UniversityTianjin 300350China Nanjing Hydraulic Research Institute Nanjing 210029China

Interstitial flows in breakwater cores and seabeds are a key consideration in coastal and marine engineering designs and have a direct impact on their structural *** this paper,a unified fully coupled model for wave−permeable breakwater−porous seabed interactions is built based on an improved N−S equation.A numerical wave flume is constructed,and numerical studies are carried out by applying the finite difference *** combination with a physical model test,the accuracy of the numerical simulation results is verified by comparing the calculated and measured values of wave height at measurement points and the seepage pressure within the breakwater and *** this basis,the characteristics of the surrounding wave field and the internal flow field of the pore structure,as well as the evolution process of the fluctuating pore water pressure inside the breakwater and seabed,are further *** spatial distribution of the maximum fluctuating pore water pressure in the breakwater is compared between two cases by considering whether the seabed is permeable,and then the effect of seabed permeability on the dynamic pore water pressure in the breakwater is *** study attempts to provide a reference for breakwater design and the protection of nearby seabeds.

关键词： wave−breakwater−seabed interaction permeable breakwater porous seabed pore water pressure finite difference method

The Structure on Invariant Measures of C^1 Generic Diffeomorphisms

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Acta Mathematica Sinica,English Series 2012年第4期28卷 817-824页

作者： Wen Xiang SUN Xue ting tian LMAM School of Mathematical SciencesPeking University Academy of Mathematics and Systems Science Chinese Academy of Sciences School of Mathematical Sciences Peking University

Let Λ be an isolated non-trivial transitive set of a C1 generic diffeomorphism f ∈ Diff（M）. We show that the space of invariant measures supported on A coincides with the space of accumulation measures of time averages on one orbit. Moreover, the set of points having this property is residual in Λ （which implies that the set of irregular＋ points is also residual in Λ）. As an application, we show that the non-uniform hyperbolicity of irregular＋ points in A with totally 0 measure （resp., the non-uniform hyperbolicity of a generic subset in Λ） determines the uniform hyperbolicity of Λ.

关键词： Generic property invariant measure and periodic measure hyperbolic basic set topolog-ically transitive irregular point

Study on the Set-up and Set-down Induced by Breaking Waves Over A Reef

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China Ocean Engineering 2020年第6期34卷 853-862页

作者： LIU Qing-jun WANG Deng-ting WEI Zhang-ping XU Hua SUN tian-ting Nanjing Hydraulic Research Institute Nanjing 210029China College of Harbour Coastal and Offshore Engineering Hohai UniversityNanjing 210098China Key Laboratory of Port Waterway&Sedimentation Engineering of MOTNanjing 210029China Department of Physics and Physical Oceanography University of North Carolina WilmingtonWilmingtonNC 28403USA

This paper proposes an equation to calculate breaking wave induced wave set-up and set-down along reef flat. The mathematical equation was derived based on the theory of radiation stress and the conservation of wave energy. The equation is primarily determined by several physical variables including the breaking wave index, the stable wave index, the attenuation coefficient of wave energy flux, and the flow velocity in the re-stabilization zone. A series of laboratory experiments were carried out to calibrate the theoretical equations. Specifically, the breaking wave index,the stable wave index, and the velocity over the reef flat were measured in the laboratory. The attenuation coefficient of wave energy flux in our theoretical equation was determined by calibration by comparing with the laboratory measured wave height. Furthermore, it has been put forward that the velocity based on cnoidal wave theory could be used to determine the velocity over the reef flat if there is no velocity measurement available. Overall, the proposed equation can provide satisfactory prediction of wave set-up and set-down along the reef flat.

关键词： wave set-up and set-down streamwise variation breaking waves reef flat reef terrain

Deviation Property of Periodic Measures in C^1 Non-uniformly Hyperbolic Systems with Limit Domination

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Acta Mathematica Sinica,English Series 2012年第9期28卷 1727-1740页

作者： Sheng QIAN Wen Xiang SUN Xue ting tian Department of Mathematics Peking University Academy of Mathematics and Systems Science Chinese Academy of Sciences

In a C1 non-uniformly hyperbolic systems with limit domination, we consider the periodic measures that supported on the Pesin set and keep a distance at least 6 to a hyperbolic ergodic measure μ given before. And then, we bound from top the exponential growth rate of such periodic measures by the supremum of measure theoretic entropy on a closed set.

关键词： Exponential growth rate generalized entropy large deviation limit domination Pesin set

Experimental Study on Scouring and Silting Deformation of Artificial Beach Under Storm Surge−Wave Coupling

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China Ocean Engineering 2022年第1期36卷 65-75页

作者： SUN tian-ting HU Po PAN Jun-ning HOU Yi-jun MO Dong-xue WANG Deng-ting Nanjing Hydraulic Research Institute Nanjing 210029China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210029China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

With the increasing construction of artificial beach in coastal areas, it is of practical significance to study the beach surface deformation of artificial beach profile. Previous studies only focus on a single wave dynamic factor, and it is difficult to predict the beach deformation of artificial beach profile under the storm surge-wave co-action. To solve this problem, the cross-section physical model test method was used to study the beach surface deformation of a typical artificial beach profile in Shuangdao Bay, Weihai, Shandong Province, after continuous wave actions till they stabilize. The characteristics of beach surface deformation under the conditions of constant water levels, laddershaped water level combined with corresponding wave elements and storm surge-wave co-action are compared and analyzed. A beach profile model which satisfies the theory of Bruun model is proposed. The test results show that the maximum scour depth of beach under storm surge-wave co-action is smaller and the scour range is obviously larger than that under the condition of constant water levels or ladder-shaped water level. The evaluation of the maximum scour depth by traditional model test tends to be conservative while the evaluation of the scour range is *** research results can provide scientific reference for designing artificial beaches.

关键词： artificial beach scouring and silting deformation profile shape physical model tests storm surge-wave coupling

Study of customer acquisition support system for mobile operators

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 123-128页

作者： ZHANG Xiao-hang LV ting-jie YANG tian-jian School of Economics and Management Beijing University of Posts andTelecommunications Beijing 100876 China

The mobile operators are struggling for improving the market share and the revenues. One important method is to acquire the potential customers from the competitors. This article presents a whole acquisition process and an integrated framework for customer acquisition support system （CASS）. The core of the system is the customer acquisition identification models which are built based on data mining technologies. The CASS can automate the acquisition process and decrease the cost and implement precise marketing strategy for mobile operators.

关键词： CASS data mining mobile

Model Test Research of Breakwater Core Material Influence on Wave Propagation

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China Ocean Engineering 2016年第5期30卷 786-793页

作者： WANG Deng-ting SUN tian-ting CHEN Wei-qiu ZHU Jia-ling Nanjing Hydraulic Research Institute Nanjing 210029China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

The interaction between waves and porous breakwater has an important theoretical significance and great application value of *** this paper,the tests of the core material's influence in rubble mound breakwater on wave propagation are carried *** relations among the transmitted wave height,incident wave element,and breakwater width are *** calculation formula is *** test results show that different core materials have obvious influence on wave propagation.

关键词： core material simulation permeable wave height transmitted coefficient

Experimental Study on Mean Overtopping of Sloping Seawall Under Oblique Irregular Waves

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China Ocean Engineering 2017年第3期31卷 350-356页

作者： WANG Deng-ting JU Lie-hong ZHU Jia-ling WANG Zhen SUN tian-ting CHEN Wei-qiu Nanjing Hydraulic Research Institute Nanjing 210029 China College of Harbour Coastal and Offshore Engineering Hohai University Nanjing 210098 China

In this paper, domestic and abroad research progresses and related calculation formulae of the mean overtopping discharge are summarized. Through integral physical model experiments, the relation between the wave direction and the overtopping discharge on the top of the sloping dike is focused on and put into analysis and discussion; and a modified formula for mean overtopping discharges under oblique irregular waves is proposed. The study shows that the mean overtopping discharge generally goes down as the relative wave obliquity fl increases for a fixed measurement point and the mean overtopping discharge generally increases as the wave steepness H/L decreases （the cycle increases） for a fixed relative wave obliquity.

关键词： mean overtopping discharge oblique wave sloping dike

Experimental Study of Overtopping on Sea Dikes and Coastal Flooding Under the Coupled Processes of Tides and Waves

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China Ocean Engineering 2022年第3期36卷 413-426页

作者： LI Yan-ting ZENG Cheng-jie Zhao Yi-han HU Po SUN tian-ting HOU Yi-jun MO Dong-xue WANG Deng-ting School of Civil Engineering Tianjin UniversityTianjin 300350China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Water Resources Department of Jiangsu Province Nanjing 210029China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Storm surges are cataclysmic natural disasters that occur along the coasts and are usually accompanied by large *** effects of coupled storm surges and waves can pose a significant threat to coastal *** labo-ratory studies on the effects of storm surges and waves on coastal structures have typically utilized steady water levels and constant wave *** indoor simulation of the coupled processes of tides and waves is developed by adding a tide generation system to an existing laboratory wave basin to model continuous dynamic tide levels so that tide generation and wave-making occur synchronously in the *** experimental methods are given,which are applied to further study waves overtopping on artificial sea dikes and coastal flooding evolution under the coupled actions of tides and *** results of the overtopping discharge obtained by the test with a dynamic water level are compared with those obtained from steady water level tests and the existing empirical *** addition,the impacts of ecological coastal shelterbelts and structures on coastal flood processes and distributions are also *** proposed simulation methods provide a new approach for studying the effects of storm surges and waves on coastal *** study also aims to provide a reference for coastal protective engineering.

关键词： storm surge water level variation wave overtopping coastal flooding experimental technique