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<p>Storm events play a crucial role in modulating sediment transport and seabed dynamics on continental shelves. In this study, we focused on Typhoon Higos (2020) as a representative storm and used the Coupled-Ocean-Atmospheric-Wave-Sediment Transport (COAWST) modeling system to investigate its impact on sediment dynamics on the shelf adjacent to the Pearl River estuary, China. The results show that the typhoon significantly suppressed the Pearl River plume against the coastline, forming a sharp density front. The enhanced bottom stress due to elevated current and wave forces resuspended the bottom sediments and elevated the suspended sediment concentration (SSC) greatly. The suspended sediments were transported by the southwestward currents, with fluxes on orders of magnitude higher than those observed before and after the storm. The seabed was more eroded on the right side of the typhoon track. Notably, the effects of the typhoon on seabed change lasted for months, probably until the arrival of new storm events. The overall effect of the storm was to reduce the deposition in the proximal depo-center near the PRE’s mouth and enhance the deposition in the distal mud belt along the southwest Guangdong coast.</p>

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Impact of a typhoon event on sediment dynamics on the continental shelf adjacent to the Pearl River Estuary, China

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Weiming Xu,
  • Jiaxi Wang,
  • Suan Hu,
  • Pengpeng Hu,
  • Xiuquan Zhu,
  • Guang Zhang,
  • Wenping Gong

摘要

Storm events play a crucial role in modulating sediment transport and seabed dynamics on continental shelves. In this study, we focused on Typhoon Higos (2020) as a representative storm and used the Coupled-Ocean-Atmospheric-Wave-Sediment Transport (COAWST) modeling system to investigate its impact on sediment dynamics on the shelf adjacent to the Pearl River estuary, China. The results show that the typhoon significantly suppressed the Pearl River plume against the coastline, forming a sharp density front. The enhanced bottom stress due to elevated current and wave forces resuspended the bottom sediments and elevated the suspended sediment concentration (SSC) greatly. The suspended sediments were transported by the southwestward currents, with fluxes on orders of magnitude higher than those observed before and after the storm. The seabed was more eroded on the right side of the typhoon track. Notably, the effects of the typhoon on seabed change lasted for months, probably until the arrival of new storm events. The overall effect of the storm was to reduce the deposition in the proximal depo-center near the PRE’s mouth and enhance the deposition in the distal mud belt along the southwest Guangdong coast.