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Title: Analysis and interpretation of littoral environment observation (LEO) and profile data along the western panhandle coast of Florida
Authors: Balsillie, James H.
Keywords: Beach erosion--Florida
Sedimentation and deposition--Florida
Publisher: Coastal Engineering Research Center (U.S.)
Series/Report no.: Technical memorandum;no. 49
Abstract: Abstract: In 1969, observation and profile stations were established along a 100-mile segment of the western panhandle coast of Florida. Visual measurements of littoral phenomena were taken using systematic techniques of the Littoral Environment Observation (LEO) observations were made Program. At six LEO stations, daily of breaker height, longshore period, and direction of approach, current speed and direction, and windspeed and direction. slope was measured daily, and sand samples were collected monthly. profiles were measured from piers at Breaker heights were found to increase from east to west. Waves approached the shoreline from eastern quadrants a greater percent of the time than from western quadrants especially along the western part of the study area, showing agreement with net westerly directed longshore current and longshore transport movement, and dominant wind approach directions. Net annual longshore currents ranged from 0.50 to 0.30 feet per second, and were higher in magnitude along the western part of the study area than along the eastern segment. Predicted net annual longshore transport rates ranged from 196,000 to 274,000 cubic yards per year, and again were larger to the west than to the east. Volume change between consecutive monthly profiles indicate net losses of sediment from the littoral zone along most be the study area, with only serious losses at one locality along the western segment. Profile data and aerial photos show the coast to be characterized by a dual bar system - an inner bar that at times is linear and at other times is broken and sinuous; and an outer, more continuous, persistent bar that acts as a buffer to storm wave attack. Sediments of the swash zone are medium- to coarse-grained, and well to very well sorted. Sediments coarsen to the west with a corresponding increase in foreshore slope in the same direction. Distribution of individual samples were found to exhibit bimodal characteristics. six localities.
Description: Technical Memorandum
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Memorandum

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