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Study on Wave Dissipation of the Structure Combined by Baffle and Submerged Breakwater

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China Ocean Engineering 2017年第6期31卷 674-682页

作者： JU Lie-hong zuo Qi-hua TENG Ling wang xing-gang Nanjing Hydraulic Research Institute Nanjing 210029 China College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 China Key Laboratory of Port Waterway and Sedimentation Engineering of the Ministry of Transport Nanjing 210029 China

This paper proposes a structure combined by baffle and submerged breakwater （abbreviated to SCBSB in the following texts）. Such a combined structure is conducive to the water exchange in the harbor, and has strong capability on wave dissipation. Our paper focuses on the discussion of two typical structures, i.e., the submerged baffle and rectangular breakwater combined with the upper baffle respectively, which are named as SCBSB 1 and SCBSB2 for short. The eigenfunction method corrected by experimental results is used to investigate the wave dissipation characteristics. It shows that the calculated results agree well with the experimental data and the minimum value of the wave transmission coefficient can be obtained when the distance between the front and rear structures is from 1/4 to 1/2 of the incident wave length.

关键词： combined wave dissipation structure eigenfunction method physical model experiment transmissioncoefficient correction wave dissipation effect

Experimental Study on Wave Attenuation Performance of A New Type of Floating Breakwater with Twin Pontoons and Multi Porous Vertical Plates

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China Ocean Engineering 2022年第3期36卷 384-394页

作者： SHEN Yu-sheng PAN Jun-ning ZHOU Yi-ren wang xing-gang River and Harbour Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210024China

A floating breakwater(FB)has extensive potential applications in the fields of coastal,offshore,and ocean engineering owing to its advantages such as eco-friendliness,low cost,easy and rapid construction,and quick dismantling and *** FB composed of twin pontoons and multi-porous vertical plates is proposed to improve the wave attenuation *** wave attenuation performance is investigated for different FB structures and vertical plate types under different incident wave heights and periods using 2D wave physical model tests in a wave *** results demonstrate that the proposed FB has a better performance than that of the conventional single pontoon-type *** reduces the wave transmission due to its enhanced wave reflection and energy *** wave transmission coefficient of the proposed FB decreases with an increase in the number of layers and relative draft depth of the vertical ***,a further decrease in the wave transmission coefficient is not observed when the number of porous vertical plates is increased from 4 to 5 *** equation has been derived to predict the wave transmission of the proposed FB based on the experimental results.

关键词： Floating breakwater twin pontoons porous vertical plates layer numbers relative draft wave attenuation performance experimental model test

A Comprehensive Lagrangian Transport Study in A Long-Narrow Bay,Xiangshan Bay,China

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China Ocean Engineering 2020年第4期34卷 581-588页

作者： HAN Song-lin LIANG Shu-xiu wang xing-gang SUN Zhao-chen Hydraulics Department Changjiang River Scientific Research InstituteWuhan 430010China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Nanjing Hydraulic Research Institute Nanjing 210029China

Study on the transport and mixing in coastal waters is of great concern to the ocean resources exploitation and ecological system *** methods are direct and effective of researching mass *** Lagrangian tools were adopted and combined to describe water transport in a long-narrow bay,Xiangshan Bay,*** on the fields of tidal velocity simulated from the 3-D hydrodynamic model,Lagrangian Coherent Structures(LCSs)and synoptic Lagrangian maps(SLMs)were calculated in the study *** comparison of the results,the features and relation of the two tools were *** results show that the LCSs act as the separatrix of the water regions with different transport characteristics and can identify the water areas with different transport time *** comprehensive application of the Lagrangian tools is helpful to obtain more insight into the water transport process.

关键词： transport and mixing Lagrangian coherent structures synoptic Lagrangian maps Xiangshan Bay

Development of Near Infrared Spectroscopy for Rapid Quality Assessment of Red Ginseng

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Chemical Research in Chinese Universities 2009年第5期25卷 633-637页

作者： NIE Li-xing wang gang-li LIN Rui-chao National Institute for the Control of Pharmaceutical and Biological Products Beijing 100050 P. R. China

Near infrared spectroscopy（NIRS） was developed as a rapid analysis method for the qualitative and quantitative assessment of the quality of red ginseng. Discriminant analysis（DA） based on principal component analysis and Mahalanobis distance was used to distinguish red ginseng from counterfeits non-destructively. The result shows that the proposed method could distinguish red ginseng from counterfeits correctly and no misclassified sample was found in both training and test sets. The partial least squares（PLS） algorithm was used to predict the sum of ginsenosides Re and Rgl and the content of ginsenoside Rb1. Two calibration models were developed to correlate NIR spectra with the reference values determined by HPLC method. The correlation coefficient（R）, the root mean square error of calibration（RMSEC） and the root mean square error of prediction（RMSEP） were as follows： R=0.9827, RMSEC=0.0163%, RMSEP=0.0250% for the sum of ginsenosides Re and Rgl; R=0.9869, RMSEC=0.0156%, RMSEP=0.0256% for content of ginsenoside Rb1. The overall results demonstrate that NIRS coupled with chemometrics could be successfully applied as a rapid, precise and cost-effective method not only to identify the red ginseng from counterfeits but also to determine simultaneously some chemical compositions in red ginseng.

关键词： Near infrared soectroscopy Red ginseng Discriminant analysis Partial least squares

SPH Numerical Modeling for the Wave–Thin Structure Interaction

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China Ocean Engineering 2018年第2期32卷 157-168页

作者： REN Xi-feng SUN Zhao-chen wang xing-gang LIANG Shu-xiu State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Nanjing Hydraulic Research Institute Nanjing 210029China

In this paper, a numerical model of 2D weakly compressible smoothed particle hydrodynamics(WCSPH) is developed to simulate the interaction between waves and thin structures. A new color domain particle(CDP)technique is proposed to overcome difficulties of applying the ghost particle method to thin structures in dealing with solid boundaries. The new technique can deal with zero-thickness structures. To apply this enforcing technique, the computational fluid domain is divided into sub domains, i.e., boundary domains and internal domains. A color value is assigned to each particle, and contains the information of the domains in which the particle belongs to and the particles can interact with. A particle, nearby a thin boundary, is prevented from interacting with particles, which should not interact with on the other side of the structure. It is possible to model thin structures, or the structures with the thickness negligible with this technique. The proposed WCSPH module is validated for a still water tank, divided by a thin plate at the middle section, with different water levels in the subdomains, and is applied to simulate the interaction between regular waves and a perforated vertical plate. Finally, the computation is carried out for waves and submerged twin-horizontal plate interaction. It is shown that the numerical results agree well with experimental data in terms of the pressure distribution, pressure time series and wave transmission.

关键词： SPH CDP thin plate wave–structure interaction

Inverse Calculation of Wave-Absorbing Structure Dimensions Based on Extended ANFIS Model

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China Ocean Engineering 2018年第5期32卷 501-513页

作者： TIAN Zheng-lin SUN Zhao-chen LIANG Shu-xiu wang xing-gang The State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Nanjing Hydraulic Research Institute Nanjing 210029China

A new wave energy dissipation structure is proposed, aiming to optimize the dimensions of the structure and make the reflection of the structure maintain a low level within the scope of the known frequency band. An optimal extended ANFIS model combined with the wave reflection coefficient analysis for the estimation of the structure dimensions is established. In the premise of lower wave reflection coefficient, the specific sizes of the structure are obtained inversely, and the contribution of each related parameter on the structural reflection performance is analyzed. The main influencing factors are determined. It is found that the optimal dimensions of the proposed structure exist, which make the wave absorbing performance of the structure reach a perfect status under a wide wave frequency band.

关键词： new absorbing structure COMBLOC reflected coefficients structural sizes inversion model extended ANFIS

Effect of the Coefficient on the Performance of A Two-Layer Boussinesq- Type Model

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China Ocean Engineering 2021年第1期35卷 36-47页

作者： SUN Jia-wen LIU Zhong-bo wang xing-gang FANG Ke-zhao DU Xin-yuan wang Ping State Environmental Protection Key Laboratory of Marine Ecosystem Restoration National Marine Environmental Monitoring CenterDalian 116023China Transportation Engineering College Dalian Maritime UniversityDalian 116026China Nanjing Hydraulic Research Institute Nanjing 210029China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Liaoning natural resources Affairs Service Center Shenyang 110032China

The coefficients embodied in a Boussinesq-type model are very important since they are determined to optimize the linear and nonlinear *** most conventional Boussinesq-type models,these coefficients are assigned the specific *** for the multi-layer Boussinesq-type models with the inclusion of the vertical velocity,however,the effect of the different values of these coefficients on linear and nonlinear performances has never been investigated *** present study focuses on a two-layer Boussinesq-type model with the highest spatial derivatives being 2 and theoretically and numerically examines the effect of the coefficient on model *** analysis show that different values for(0.13≤α≤0.25)do not have great effects on the high accuracy of the linear shoaling,linear phase celerity and even third-order nonlinearity for water depth range of 0

关键词： two-layer Boussinesq-type model dispersion nonlinear properties shoaling amplitude

A Hybrid Finite-Volume and Finite Difference Scheme for Depth- Integrated Non-Hydrostatic Model

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China Ocean Engineering 2017年第3期31卷 261-271页

作者： YIN- Jing SUN Jia-wen wang xing-gang YU Yong-hai SUN Zhao-chen National Marine Environmental Monitoring Center Dalian 116023 China Key State Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023 China Nanjing Hydraulic Research Institute Nanjing 210029 China

A depth-integrated, non-hydrostatic model with hybrid finite difference and finite volume numerical algorithm is proposed in this paper. By utilizing a fraction step method, the governing equations are decomposed into hydrostatic and non-hydrostatic parts. The first part is solved by using the finite volume conservative discretization method, whilst the latter is considered by solving discretized Poisson-type equations with the finite difference method. The second-order accuracy, both in time and space, of the finite volume scheme is achieved by using an explicit predictor-correction step and linear construction of variable state in cells. The fluxes across the cell faces are computed in a Godunov-based manner by using MUSTA scheme. Slope and flux limiting technique is used to equip the algorithm with total variation dimensioning property for shock capturing purpose. Wave breaking is treated as a shock by switching off the non-hydrostatic pressure in the steep wave front locally. The model deals with moving wet/dry front in a simple way. Numerical experiments are conducted to verify the proposed model.

关键词： non-hydrostatic model shock-capturing wave breaking finite volume method MUSTA scheme

DYNAMIC RESPONSE ANALYSIS OF DDMS PLATFORM SUBJECTED TO ACTIONS OF WAVE GROUPS AND CURRENT FOURCES

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Journal of Hydrodynamics 2011年第6期23卷 697-708页

作者： SUN Zhao-chen wang xing-gang LIANG Shu-xiu LIU Shu-Xue LIU Si State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024China

Coupled dynamic analysis of the Deep Draft Multi-Spar （DDMS） platform and the mooring system under the action of waves and current is carried out in the time domain. Using a geometrically nonlinear finite element method, the mooring-line dynamics is simulated based on the total Lagrangian formulation. Wave groups are obtained by the JONSWAP spectrum and an empirical wave envelope spectrum involving two envelope-based factors Group Height Factor （GFH） and Group Length Factor （GLF）. The results show that the wave groups have a significant effect on the motion responses of the platform and the mooring line tensions.

关键词： Deep Draft Multi Spar (DDMS) platform dynamic response wave groups current fources