Field Observations of Alongshore Runup Variability Under Dissipative Conditions in the Presence of a Shoreline Sandwave
Author
Senechal, Nadia
Coco, Giovanni
Plant, Nathaniel
Bryan, Karin R.
Brown, Jenna
MacMahan, Jamie H.M.
Date
2018Metadata
Show full item recordAbstract
Video measurements of runup were collected at low tide along several profiles covering an
alongshore distance of 500 m. The morphology displayed a complex shape with a shoreline sandwave in
the lower beach face of about 250 m long mirrored in the inner sandbar. Wave conditions were stationary
and moderate (offshore height of 2 m and peak period of nearly 13 s) but yet dissipative. Runup energy was
dominated by infragravity frequencies. Alongshore variations in runup (by a factor up to 3) observed both in
the incident and infragravity bands were much higher than reported previously (e.g., Guedes et al., 2012,
https://doi.org/10.1016/j.csr.2012.08.022; Ruggiero et al., 2004, https://doi.org/10.1029/2003JC002160) while
the alongshore variations in other environmental parameters (e.g., foreshore beach slope) appear to be much
lower. Our data suggest that the beach morphology in the inner surf zone plays a crucial role by inducing
rapid and significant modification in the incident wave pattern and the alongshore coherence length scales
were consistent with the typical alongshore length scale of the morphology.
Description
The article of record as published may be found at http://dx.doi.org/10.1029/2018JC014109
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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