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Apr 26, 2012
Mixed Sediment Beach Processes: Kachemak Bay, Alaska
Authors: Peter Ruggiero [email protected], Peter N. Adams [email protected], and Jonathan A. Warrick [email protected]Author Affiliations
Publication: Coastal Sediments '07
Abstract
Mixed sediment beaches are morphologically distinct from and more complex than either sand or gravel only beaches. Three digital imaging techniques are employed to quantify surficial grain size and bedload sediment transport rates along the mixed sediment beaches of Kachemak Bay, Alaska. Applying digital imaging procedures originally developed for quickly and efficiently quantifying grain sizes of sand to coarse sediment classes gives promising results. Hundreds of grain size estimates lead to a quantitative characterization of the region's sediment at a significant reduction in cost and time as compared to traditional techniques. Both the sand and coarse fractions on this megatidal beach mobilize into self-organized bedforms that migrate alongshore with a seasonally reflecting the temporal pattern of the alongshore component of wave power. In contrast, the gravel bedforms also migrate in the cross-shore without significant seasonally suggesting that swash asymmetry is sufficient to mobilize the gravel even during low energy summer conditions.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Department of Geosciences, Oregon State University, 104 Wilkinson Hall, Corvallis, OR, 97331. E-mail: [email protected]
Department of Geological Sciences, University of Florida, 241 Williamson Hall, P.O. Box 112120 Gainesville, FL, 32611. E-mail: [email protected]
Coastal and Marine Geology Program, USGS Pacific Science Center, 400 Natural Bridges Drive, Santa Cruz, CA 95060. E-mail: [email protected]
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