Spatial and temporal patterns of sediment activation depth on a high-energy microtidal beach

L Gómez-Pujol, Derek Jackson, J Cooper, G Málvarez, F Navas, C Loureiro, Thomas Smyth

    Research output: Contribution to conferencePaper

    3 Citations (Scopus)

    Abstract

    Sediment activation depth, by means of continuous temporal high-resolution sampling (Sediment Activity Meter - SAM) and tide-to-tide (DOD rods), field data were collected during six low tide conditions on a high-energy micro-tidal sandy beach. A large swell event also occurred during the experiment with offshore wave heights of 6 m. Waves at the intertidal zone reached heights of 0.30 m and periods 5 s during the pre- and post-storm scenarios; whereas waves heights of up to 0.60 m and periods of 6 s during the swell event. Sediment activation previous to the swell event reached values of 0.035 m, whilst during the storm increased to 0.24 m, and finally once the beach had recovered and the tidal range increased, the sediment-moving layer was 0.062 m in depth. The use of DOD rod data reveals a spatial gradient in sediment activation depth where the maximum activation depths are recorded at mean high water position at each high tide giving unimodal-like distribution of activity across the beach width. Use of the SAM method reveals a complex variability in beach surface position during each high-tide level. As the daily tidal range increased during the experiment, the location of the highest activation depth also advanced landward with this increase.

    Original languageEnglish
    Pages85-89
    Number of pages5
    Publication statusPublished - 2011
    Event11th International Coastal Symposium -
    Duration: 9 May 2011 → …

    Conference

    Conference11th International Coastal Symposium
    Period9/05/11 → …

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  • Cite this

    Gómez-Pujol, L., Jackson, D., Cooper, J., Málvarez, G., Navas, F., Loureiro, C., & Smyth, T. (2011). Spatial and temporal patterns of sediment activation depth on a high-energy microtidal beach. 85-89. Paper presented at 11th International Coastal Symposium, .