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3 results for “surfzone”
Eddy Duck Data: Measured Three-Dimensional Structure of Surfzone Velocities
<p>This archive contains data from the 2011 EddyDuck experiment. Three-dimensional structure of surfzone velocity fields was measured using 12 horizontally-spaced Nortek Aquadopp current meters, each instrument measuring vertical profiles of water velocity. The experiment was conducted by folks from Washington State University and Oregon State University, with help from staff of the USACE's Duck Field Research Facility.</p> <p>Funding from the US National Sciences Foundation, Award OCE-1061692</p> <p>An in-review JGR-Oceans manuscript “Depth-Dependence of Nearshore Currents and Eddies” discusses the observations.</p> <p> </p> <p>Data are contained in two zip files.</p> <p>File summary.zip unzips to give a folder containing summary data in matlab 2015b format, and a pdf readme file explaining details.</p> <p>Folder full.zip unzips to give a folder containing full time-resolution data in ASCII format, and a readme file explaining details.</p> <p> </p> <p> </p> <p>Questions to steve_henderson@wsu.edu</p>
Data from: Alongshore variation in barnacle populations is determined by surfzone hydrodynamics
Larvae in the coastal ocean are transported toward shore by a variety of mechanisms. Crossing the surf zone is the last step in a shoreward migration and surf zones may act as semipermeable barriers altering delivery of larvae to the shore. We related variation in the structure of intertidal barnacle populations to surfzone width (surfzone hydrodynamics proxy), wave height, alongshore wind stress (upwelling proxy), solar radiation, and latitude at 40 rocky intertidal sites from San Diego, California to the Olympic Peninsula, Washington. We measured daily settlement and weekly recruitment of barnacles at selected sites and related these measures to surfzone width. Chthamalus density varied inversely with that of Balanus, and the density of Balanus and new recruits was negatively related to solar radiation. Across the region, long-term mean wave height and an indicator of upwelling intensity and frequency did not explain variation in Balanus or new-recruit densities. Balanus and new-recruit densities, daily settlement and weekly recruitment were up to three orders of magnitude higher at sites with wide (> 50 m), more dissipative surf zones with bathymetric rip currents than at sites with narrow (< 50 m) more reflective surf zones. Thirty to 50% of the variability in Balanus and new-recruit densities was explained by surfzone width. We sampled a subset of sites < 5 km apart where coastal hydrodynamics such as upwelling should be very similar. At paired sites with similar surfzone widths, Balanus densities were not different. If surfzone widths at paired sites were dissimilar, Balanus densities, daily settlement and weekly recruitment were significantly higher at sites with the wider more dissipative surf zone. The primary drivers of surfzone hydrodynamics are the wave climate and the slope of the shore and these persist over time, and therefore site-specific stability in surfzone hydrodynamics should result in stable barnacle population characteristics. Variations in surfzone hydrodynamics appear to play a fundamental role in regulating barnacle populations along the open coast, which in turn may have consequences for the entire intertidal community.
Data from: Alongshore variation in barnacle populations is determined by surfzone hydrodynamics
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