Accession Number : ADA139947

Title :   Classification of Coastal Environments, Shorezone Profile Dynamics.

Descriptive Note : Technical rept.,


Personal Author(s) : Wayland,R J ; Hayden,B P

PDF Url : ADA139947

Report Date : Mar 1984

Pagination or Media Count : 76

Abstract : Principal components analysis was used to quantify subaerial and subaqueous summer to winter nearshore morphological change on the North Carolina coast near Duck. The first two eigenvectors explained 61.1% of the total variance. El (35.4% of the variance) is a profile rotation and E2 (25.7% of the variance) is a bar/trough function. Two major periods of change were found. High pressure systems in October and extratropical cyclones in November were the weather systems implicated in these changes. These storms caused the profiles to become dissipative. Steepness declined and two bars replaced a single bar profile form. A relationship between pre-existing morphology and subsequent changes in the equilibrium bar/trough morphology was observed during the storm period. Wave characteristics (height, period, steepness, direction, and breaker type) could not be associated with profile changes. The simultaneous offshore sediment movement across three well-defined zones of the shorezone suggest that shore-normal edge waves may be the dominant causative agent for these changes.

Descriptors :   *Beaches, North Carolina, Ocean bottom topography, Inshore areas, Profiles, Modification, Storms, Ocean waves, Statistical analysis

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE