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<p>Seafloor microtopography, resulting from interactions between water flow and sediment, exhibits distinctive ripple patterns. Accurately predicting the geometry of these ripples is crucial for simulating the dynamics of the bottom boundary layer and sediment transport. This study introduces a seafloor microtopography observation system using profiling sonar technology. A set of methods and procedures are proposed for processing point cloud data related to seafloor microtopography, ultimately constructing a high-precision three-dimensional model. An experiment of dynamic changes in the microtopography of a sandy seabed utilizing this system and model was conducted within an indoor water tank. A suspended mud layer was identified at the seabed bottom, and changes in sand ripples were observed. The ripples formed during this experiment exhibited characteristics of symmetrical sinusoidal patterns with a ripple height less than 2&#xa0;mm and a steepness not exceeding 0.1. The relationship between ripple height (H) and wavelength (L) followed the equation H = 0.00158L<sup>0.0743</sup>. The impact of waves on seafloor microtopography is primarily manifested in two aspects. First, under wave action, sediment particles on a flat seabed or ripples with a height below 1.5&#xa0;mm underwent movement or suspension, potentially leading to an increase in ripple scale or erosion and the disappearance of ripples. Second, ripples with a height exceeding 1.5&#xa0;mm were dominated by wave-induced erosion, preventing the formation of larger-scale ripples. These findings provide guidance for the identification of marine microtopographic features and changes in the marine environment.</p>

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A study on the dynamic changes in micro-geomorphology of sandy seafloor under the influence of wave action

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月14日

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  • Xuezhi Feng,
  • Fei Liu,
  • Feifei Zhang,
  • Wenli Han,
  • Lihong Wen,
  • Dong He,
  • Hongxiao Lv,
  • Qian Liang,
  • Yangli Che,
  • Chaoqi Zhu,
  • Yonggang Jia

摘要

Seafloor microtopography, resulting from interactions between water flow and sediment, exhibits distinctive ripple patterns. Accurately predicting the geometry of these ripples is crucial for simulating the dynamics of the bottom boundary layer and sediment transport. This study introduces a seafloor microtopography observation system using profiling sonar technology. A set of methods and procedures are proposed for processing point cloud data related to seafloor microtopography, ultimately constructing a high-precision three-dimensional model. An experiment of dynamic changes in the microtopography of a sandy seabed utilizing this system and model was conducted within an indoor water tank. A suspended mud layer was identified at the seabed bottom, and changes in sand ripples were observed. The ripples formed during this experiment exhibited characteristics of symmetrical sinusoidal patterns with a ripple height less than 2 mm and a steepness not exceeding 0.1. The relationship between ripple height (H) and wavelength (L) followed the equation H = 0.00158L0.0743. The impact of waves on seafloor microtopography is primarily manifested in two aspects. First, under wave action, sediment particles on a flat seabed or ripples with a height below 1.5 mm underwent movement or suspension, potentially leading to an increase in ripple scale or erosion and the disappearance of ripples. Second, ripples with a height exceeding 1.5 mm were dominated by wave-induced erosion, preventing the formation of larger-scale ripples. These findings provide guidance for the identification of marine microtopographic features and changes in the marine environment.