Journal
COASTAL ENGINEERING JOURNAL
Volume 64, Issue 3, Pages 406-427Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/21664250.2022.2089445
Keywords
Intertidal mudflat; mud transport; sand transport; numerical modeling; cohesive sediment
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Funding
- PhilippineAmerican Educational Foundation (Fulbright Commission in the Philippines)
- US Army Corps of Engineers [W912HZ18P0134]
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This study examines the erosional and accretional profile changes of an intertidal mudflat using field data and the CSHORE numerical model. The model includes the effects of cross-shore and longshore sediment transport rates influenced by undertow and breaking waves. The study shows that mud characteristics, tide amplitude, and wave and wind conditions all contribute to the profile changes of the mudflat.
The erosional and accretional profile changes of an intertidal mudflat are examined using available field data and the cross-shore numerical model CSHORE that is extended to allow for a mixture of sand and mud. The semidiurnal migration of the still water shoreline and surf zone is resolved numerically to predict the net cross-shore and longshore sediment transport rates influenced by the small cross-shore (undertow) and longshore currents induced by breaking waves of about 0.2 m height. Alongshore sediment loss or gain is included by approximating the alongshore sediment transport gradient using an equivalent alongshore length. The calibrated CSHORE reproduces the measured erosional (accretional) profile change of about 0.1 m (0.1 m) over a cross-shore distance of 950 m during the erosional (accretional) interval of 206 (195) days. The mudflat profile changes are equally affected by mud characteristics, the semidiurnal tide amplitude, and the wave height, period, and direction. In addition, the alongshore water level gradient and wind stress influence longshore current and sediment transport. This study shows the importance of sediment transport in the surf zone that may have been excluded in previous numerical modeling.
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