Changes in Beachface Bed Elevation over a Tidal Cycle on Santa Rosa Island, Florida and Matagorda, Texas
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Wave-scale changes in beach elevation were measured using a cross-shore array of ultrasonic distance sensors on a dissipative beach at Matagorda Peninsula, Texas, in December 2008. The data collected in this study are compared to data collected in a companion study on an intermediate beach in Pensacola, Florida in June 2008. Both beaches are currently in a state of recovery from hurricane activity within the last 5 years, and therefore serve as good comparison sites for bed elevation change models. At both sites, the ultrasonic distance sensors were used to measure the bed elevation changes to 0.08 m which is smaller than the median grain size at both study sites (0.2 mm and 0.3 mm respectively). The dissipative Matagorda site was found to be less affected by swash over the study period and maintained a steady state bed elevation with max change of .01 m. In comparison, the intermediate, Pensacola site was more affected by the swash and varied by 0.14 m in its bed elevation over a tidal cycle. It is argued that iv intermediate beaches are more affected by individual swash, while dissipative beaches are more affected overtime by the migration of bedforms rather than individual swash.
Barrett, Gemma (2009). Changes in Beachface Bed Elevation over a Tidal Cycle on Santa Rosa Island, Florida and Matagorda, Texas. Available electronically from