Depth of activation on a mixed sediment beach

Document Type

Article

Publication Date

7-1-2009

Abstract

The relationship between wave height and depth of sediment activation is evaluated on an estuarine beach to determine whether activation depth is less in pebbles than sand. Rods with washers were used to monitor three excavated beach plots filled with (1) pebbles with mean grain size of 11.5 mm; (2) sand and granules; and (3) sand, granules and pebbles. Plots were monitored for 26 events over 27 days. Significant wave heights ranged from 0.18 to 0.40 m and activation depths from 0.02 to 0.12 m. Activation depths in the pebble plot were less than the other two plots when waves reworked sediment not activated during previous tidal cycles. Proportionality coefficients for activation depth to wave height, when net change was < 0.02 m, were 0.24 in the pebble plot and 0.30-0.31 in the other plots when experimental fill sediments remained and 0.22 to 0.23 in all three plots over the entire monitoring period, which included activation of newly deposited native sediment. Results suggest that for similar wave heights, activation depths in pebbles is lower than in sand, granules and pebbles or sand and granules, but once waves have reworked the sediment there is little difference in activation depths. © 2009 Elsevier B.V. All rights reserved.

Identifier

64749116151 (Scopus)

Publication Title

Coastal Engineering

External Full Text Location

https://doi.org/10.1016/j.coastaleng.2009.02.002

ISSN

03783839

First Page

788

Last Page

791

Issue

7

Volume

56

Fund Ref

U.S. Department of Commerce

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