Wave dissipation by muddy seafloors


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dc.contributor.author Elgar, Steve
dc.contributor.author Raubenheimer, Britt
dc.date.accessioned 2010-04-29T14:21:16Z
dc.date.available 2010-04-29T14:21:16Z
dc.date.issued 2008-04-12
dc.identifier.citation Geophysical Research Letters 35 (2008): L07611 en_US
dc.identifier.uri http://hdl.handle.net/1912/3358
dc.description Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 35 (2008): L07611, doi:10.1029/2008GL033245. en_US
dc.description.abstract Muddy seafloors cause tremendous dissipation of ocean waves. Here, observations and numerical simulations of waves propagating between 5- and 2-m water depths across the muddy Louisiana continental shelf are used to estimate a frequency- and depth-dependent dissipation rate function. Short-period sea (4 s) and swell (7 s) waves are shown to transfer energy to long-period (14 s) infragravity waves, where, in contrast with theories for fluid mud, the observed dissipation rates are highest. The nonlinear energy transfers are most rapid in shallow water, consistent with the unexpected strong increase of the dissipation rate with decreasing depth. These new results may explain why the southwest coast of India offers protection for fishing (and for the 15th century Portuguese fleet) only after large waves and strong currents at the start of the monsoon move nearshore mud banks from about 5- to 2-m water depth. When used with a numerical nonlinear wave model, the new dissipation rate function accurately simulates the large reduction in wave energy observed in the Gulf of Mexico. en_US
dc.description.sponsorship The Office of Naval Research provided support. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2008GL033245
dc.subject Wave dissipation en_US
dc.subject Muddy seafloor en_US
dc.subject Coastal processes en_US
dc.title Wave dissipation by muddy seafloors en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2008GL033245

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