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<p>Few studies have investigated the effects of typhoons on the topographic and sedimentological responses of macro-tide intertidal flats. Typhoon Soulik (tropical storm No. 1819) made landfall on 23 August in 2018 in the southwestern coast of Korea. Changes in accumulation and surface sediment texture before and after the typhoon were investigated in the open Donghori intertidal zone of Gochang, Korea. Surveys were conducted on 16 August, 22 August, 28 August, and 12 September before and after Typhoon Soulik. A single cross-shore transect approximately 600&#xa0;m in length was established in the Donghori intertidal zone. To examine spatial and temporal variations in topography and sediment texture, the intertidal area was subdivided into upper, middle, and lower tidal zones based on tidal elevation. The tidal zones exhibited contrasting responses to the passage of Typhoon Soulik. The upper tidal zone experienced sediment accretion of approximately 10&#xa0;cm without significant erosion. The accreted sediments suggest that fine-grained materials suspended from the middle and lower tidal zone, transported landward and covered the upper tidal zone. In contrast, the middle and lower tidal zones underwent post-typhoon sediment recovery of approximately 4–17&#xa0;cm following typhoon-induced erosion of approximately 12–20&#xa0;cm. The recovered sediments were characterized by finer mean grain size, poorer sorting, and more positive skewness values than the pre-typhoon sediments, suggesting rapid deposition of reworked sediments that included fine-grained material supplied from offshore areas. These results provide valuable insights into the contrasting sedimentary dynamics of different tidal zones within a macro-tide intertidal flat during typhoon passage.</p>

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Typhoon Response and Recovery of Topography and Surface Sediments in the Macro-Tide Intertidal Flat of the Gochang Donghori, Korea

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Woo Hun Ryang,
  • Sol Ip Kang

摘要

Few studies have investigated the effects of typhoons on the topographic and sedimentological responses of macro-tide intertidal flats. Typhoon Soulik (tropical storm No. 1819) made landfall on 23 August in 2018 in the southwestern coast of Korea. Changes in accumulation and surface sediment texture before and after the typhoon were investigated in the open Donghori intertidal zone of Gochang, Korea. Surveys were conducted on 16 August, 22 August, 28 August, and 12 September before and after Typhoon Soulik. A single cross-shore transect approximately 600 m in length was established in the Donghori intertidal zone. To examine spatial and temporal variations in topography and sediment texture, the intertidal area was subdivided into upper, middle, and lower tidal zones based on tidal elevation. The tidal zones exhibited contrasting responses to the passage of Typhoon Soulik. The upper tidal zone experienced sediment accretion of approximately 10 cm without significant erosion. The accreted sediments suggest that fine-grained materials suspended from the middle and lower tidal zone, transported landward and covered the upper tidal zone. In contrast, the middle and lower tidal zones underwent post-typhoon sediment recovery of approximately 4–17 cm following typhoon-induced erosion of approximately 12–20 cm. The recovered sediments were characterized by finer mean grain size, poorer sorting, and more positive skewness values than the pre-typhoon sediments, suggesting rapid deposition of reworked sediments that included fine-grained material supplied from offshore areas. These results provide valuable insights into the contrasting sedimentary dynamics of different tidal zones within a macro-tide intertidal flat during typhoon passage.