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

• DOI: 10.1007/s13344-023-0015-5
• Publication Date: 2023-04-04T15:02:53Z
• Authors: Zhi-peng Zang; Bo-tao Xie; Liang Cheng; Fang He; Xing Zou
• Keywords: Typhoon; Seabed; Transient (computer programming); Settling; Rogue wave

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