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IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering Pub Date : 2025-03-05 DOI:10.1016/j.coastaleng.2025.104739

K. Ions , X. Wang , D.E. Reeve , N. Mori , H. Karunarathna

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引用次数: 0

摘要

在实验室波浪水槽中进行了一系列实验，研究了沿岸刚性植被对悬浮泥沙输运的影响，以及在一系列波浪条件下沉水植被和浮出植被对床面形态的影响。在实验室波浪水槽中，研究了沉水植被和出水植被在不同波浪条件下对悬浮泥沙输运和床面形态产生的影响。选择了两种植被密度，分别代表茂密和稀疏的植被草甸。使用颗粒图像测速仪和声学反向散射传感器进行了同步流速和悬浮沉积物浓度测量。在近床流速超过沉积物运动阈值的所有情况下，都观测到了海底波纹。近床速度决定了裸露和植被沉积海底的沉积物悬浮情况。在相同波浪条件下，植被茂密海床的近床沉积物浓度低于裸露海床。这些观察结果突显了考虑植被在塑造海床形态和由此产生的悬浮沉积物浓度方面的作用的重要性。然后，用于裸露沉积物海床的近床沉积物浓度公式在植被海床上得到了验证。

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Submerged and emerged rigid vegetation impact on bedforms and sediment suspension under wave action

A series of experiments were carried out in a laboratory wave flume to investigate the impact of coastal rigid vegetation on suspended sediment transport and the generation of bedforms for a range of wave conditions for both submerged and emerged vegetations. Rigid arrays of cylindrical wooden dowels were used as vegetation mimics on a sandy bed. Two vegetation densities were selected, representing dense and sparse vegetation meadows. Synchronised flow velocity and suspended sediment concentration measurements were performed using particle image velocimetry and an acoustic backscatter sensor. Seabed ripples were observed in all cases where the near-bed velocity exceeded the threshold of sediment motion. The near-bed velocity governed sediment suspension on both bare and vegetated sediment seabeds. Near-bed sediment concentration on densely vegetated seabeds was lower than that of bare seabeds under the same wave conditions. These observations highlight the importance of considering the role of vegetation in shaping seabed morphology and the resultant suspended sediment concentrations. Then, the near-bed sediment concentration formulae used on bare sediment beds are validated for use on vegetated seabeds.

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来源期刊

Coastal Engineering 工程技术-工程：大洋

CiteScore

9.20

自引率

13.60%

发文量

审稿时长

3.5 months

期刊介绍： Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.