Scholarlink

<p>Vegetation in estuarine tidal flats exerts a significant impact on the hydrodynamic properties and sediment transport dynamics in the nearshore zone. However, there is a scarcity of studies examining the distribution of suspended sediment concentration (SSC) on vegetated beds under the combination of waves and unidirectional currents. Studies on the effects of combined waves and opposing current conditions are even more lacked. In the present paper, a set of flume experiments were conducted using the rigid submerged vegetation and suspended sediment. Vegetation canopies with aligned/staggered configurations were tested under combined waves with both following (current direction is consistent with wave propagation) and opposing currents. Results illustrate that the flow velocity and turbulent kinetic energy (TKE) were various for vegetation configurations and wave-current flow conditions. The near-bed concentration of suspended sediment rises with increasing wave height in both wave-only and wave-current flow scenarios, and it also tends to increase monotonically with the time-averaged TKE. Quadrant analysis shows that the sweep (<i>u</i>' &lt; 0, <i>w</i>' &gt; 0) event is more dominant in following flow conditions, while the ejection phenomenon (<i>u</i>' &gt; 0, <i>w</i>' &lt; 0) is found to be more pronounced under opposing currents. Furthermore, the presence of vegetation notably amplified the near-bed concentration of suspended sediments, while under wave-current interaction, suspended sediment concentration over vegetation beds may either increase or decrease compared to waves alone.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental investigation of wave-driven sediment resuspension in both following and opposing currents

  • 期刊论文

  • 发表日期：

    2025年6月7日

查看全文
  • Yuming Huang,
  • Yifei Wang,
  • Lei Ding,
  • Ben Chen,
  • Xiaoyu Yang,
  • Jian Jiao

摘要

Vegetation in estuarine tidal flats exerts a significant impact on the hydrodynamic properties and sediment transport dynamics in the nearshore zone. However, there is a scarcity of studies examining the distribution of suspended sediment concentration (SSC) on vegetated beds under the combination of waves and unidirectional currents. Studies on the effects of combined waves and opposing current conditions are even more lacked. In the present paper, a set of flume experiments were conducted using the rigid submerged vegetation and suspended sediment. Vegetation canopies with aligned/staggered configurations were tested under combined waves with both following (current direction is consistent with wave propagation) and opposing currents. Results illustrate that the flow velocity and turbulent kinetic energy (TKE) were various for vegetation configurations and wave-current flow conditions. The near-bed concentration of suspended sediment rises with increasing wave height in both wave-only and wave-current flow scenarios, and it also tends to increase monotonically with the time-averaged TKE. Quadrant analysis shows that the sweep (u' < 0, w' > 0) event is more dominant in following flow conditions, while the ejection phenomenon (u' > 0, w' < 0) is found to be more pronounced under opposing currents. Furthermore, the presence of vegetation notably amplified the near-bed concentration of suspended sediments, while under wave-current interaction, suspended sediment concentration over vegetation beds may either increase or decrease compared to waves alone.