首页|Numerical Investigations on the Transient Behavior of Sand Waves in Beibu Gulf Under Normal and Extreme Sea Conditions

Numerical Investigations on the Transient Behavior of Sand Waves in Beibu Gulf Under Normal and Extreme Sea Conditions

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In this study,a morphodynamic numerical model is established with the Regional Ocean Modeling System(ROMS)to investigate the transient behavior of sand waves under realistic sea conditions.The simulation of sand wave evolution comprises two steps:1)a regional-scale model is configured first to simulate the ocean hydrodynamics,i.e.,tides and tidal currents,and 2)the transient behavior of sand waves is simulated in a small computational domain under the time-variant currents extracted from the large model.The evolution of sand waves on the continental shelf in the Beibu Gulf is specifically investigated.The numerical results of the two-year evolution of sand waves under normal sea conditions compare well with the field survey data.The transient behavior of sand waves in individual months shows that the sand waves are more stable in April and October than that in other months,which can be selected as the windows for seabed operations.The effects of sediment properties,including settling velocity,critical shear stress and surface erosion rate,on sand wave evolution are also analyzed.Then,the typhoon-induced currents are further superimposed on the tidal currents as the extreme weather conditions.Sand waves with the average wavelength generally have more active behavior than smaller or larger sand waves.The characteristics of the evolution of sand waves in an individual typhoon process are quite different for different hydrodynamic combinations.For the storm conditions,i.e.,the real combination and maximum combination cases,the sand waves experience a significant migration together with a damping in height due to the dominant suspended sediment transport.For the mild condi-tions,i.e.,the pure tidal current and minimum combination cases,the sand waves migrate less,but the heights continue growing due to the dominant bedload transport.

sand wavesmorphodynamic numerical modelnormal sea conditionextreme sea conditionstransient behaviors

ZANG Zhi-peng、XIE Bo-tao、CHENG Liang、HE Fang、ZOU Xing

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State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China

Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration,Tianjin University,Tianjin 300350,China

CNOOC Research Institute Co.,Ltd.,Beijing 100028,China

School of Marine Science and Engineering,Guangzhou International Campus,South China University of Technology Ocean College,Zhejiang University,Zhoushan 316021,China

Ocean College,Zhejiang University,Zhoushan 316021,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaOpen Funding of State Key Laboratory of Hydraulic Engineering Simulation and Safety

5157923251890913HESS-1712

2023

中国海洋工程(英文版)
中国海洋学会

中国海洋工程(英文版)

CSTPCDCSCD北大核心EI
影响因子：0.338
ISSN：0890-5487
年,卷(期)：2023.37(2)
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