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In this study, pore water pressure was measured at different depths in the coastal sandbar together with wave and sandbar profile changes to explore the correlation between sandbar profile changes and fluctuations in pore water pressure. Shifts in sandbar profiles were compared during both erosional and depositional phases. The results revealed a relationship between the negative pressure gradient (upward pressure propagation) and the pressure gradient acceleration during pore water pressure changes in the vertical direction. In addition, a relationship was found between suspended sand concentration and vertical pressure gradient and wave steepness, with suspended sand concentration increasing under conditions with specific vertical pressure gradient (∂p/∂z = 1 ~ 2.5, −2 ~ −5 kPa/m) and wave steepness (H/L = 0.02 ~ 0.04). A comparison of instantaneous vertical pressure gradients and suspended sand concentration revealed that in some cases the latter tended to increase during the periods of negative pressure gradients. However, the high variability in the data makes it difficult to draw definitive conclusions, highlighting the need for more precise and targeted future investigations.

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Investigation of Pressure Fluctuation in Sand Layer and Suspended Sand Response Under Wave Action at the Top of Coastal Sandbar

  • 会议论文

  • 发表日期：

    2026年

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  • Yusuke Kato,
  • Takayuki Suzuki,
  • Md Shofiqul Islam,
  • Hiroto Higa,
  • Martin Mäll

摘要

In this study, pore water pressure was measured at different depths in the coastal sandbar together with wave and sandbar profile changes to explore the correlation between sandbar profile changes and fluctuations in pore water pressure. Shifts in sandbar profiles were compared during both erosional and depositional phases. The results revealed a relationship between the negative pressure gradient (upward pressure propagation) and the pressure gradient acceleration during pore water pressure changes in the vertical direction. In addition, a relationship was found between suspended sand concentration and vertical pressure gradient and wave steepness, with suspended sand concentration increasing under conditions with specific vertical pressure gradient (∂p/∂z = 1 ~ 2.5, −2 ~ −5 kPa/m) and wave steepness (H/L = 0.02 ~ 0.04). A comparison of instantaneous vertical pressure gradients and suspended sand concentration revealed that in some cases the latter tended to increase during the periods of negative pressure gradients. However, the high variability in the data makes it difficult to draw definitive conclusions, highlighting the need for more precise and targeted future investigations.