Experimental Investigation on the Mechanism of Longshore Sediment Transport Using a Circular Wave Basin

In this paper, a hydraulic model experiment was conducted to investigate the mechanism of longshore sediment transport on a sloping beach of 1:7 using a circular wave tank equipped with a spiral wave maker. The experimental results revealed that cross-shore sediment transport was predominant up to t...

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Bibliographic Details
Published in:Journal of marine science and engineering 2022-09, Vol.10 (9), p.1189
Main Authors: Islam, Mohammad Shaiful, Akita, Naoki, Nakamura, Tomoaki, Cho, Yong-Hwan, Mizutani, Norimi
Format: Article
Language:English
Subjects:
Beach profiles
Beaches
Breaking waves
circular wave tank
Coastal currents
Coastal erosion
Coastal zone management
Coasts
Cross-sections
cross-shore sediment transport
Deformation
Experiments
Fluorescence
Hydraulic models
Hydraulics
Incident waves
Laboratories
longshore current
Longshore currents
Longshore sediment transport
Propagation
Researchers
Sediment
Sediment transport
Sedimentation & deposition
Shoreline protection
Soil erosion
Velocity
Water levels
Wave breaking
Wave height
Wave tanks
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Summary:In this paper, a hydraulic model experiment was conducted to investigate the mechanism of longshore sediment transport on a sloping beach of 1:7 using a circular wave tank equipped with a spiral wave maker. The experimental results revealed that cross-shore sediment transport was predominant up to the formation of equilibrium cross-section. Then the longshore sediment transport was actively dominant near the bar after the development of equilibrium topography. The wave-breaking positions and the characteristics of sand displacement in the vicinity of the wave-breaking zone were observed throughout the installation of fluorescent sands in different cross-sections under several wave conditions on the same terrain to presume the coastal erosion. From the outcomes, it was confirmed that the gradient of the average water level due to the obliquely incident waves breaking and the differences in breaking positions along the shoreline accelerated the generation of longshore currents and longshore sediment transport in the sloping beach profile. Moreover, the actively longshore sediment transport tendency throughout the breaking waves and the longshore current had been confirmed in this study where the gradually increasing wave heights influenced the stronger degree of wave breaking on the sloping beach, which enhanced the sediment transport procedure to deform the beach profile.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10091189