. Annual data summary for 1988 CERC Field Research Facility : volume 1, main text and appendixes A and B. Oceanography; Meteorology; Ocean waves; Ocean currents. PART VII: SURVEYS 57. Waves and currents interacting with bottom sediments produce changes in the beach and nearshore bathymetry. These changes can occur very rapidly in response to storms or slowly as a result of persistent but less forceful seasonal variations in wave and current conditions. 58. Nearshore bathymetry at the FRF is characterized by regular shore- parallel contours, a moderate slope, and a barred surf zone (usually an
. Annual data summary for 1988 CERC Field Research Facility : volume 1, main text and appendixes A and B. Oceanography; Meteorology; Ocean waves; Ocean currents. PART VII: SURVEYS 57. Waves and currents interacting with bottom sediments produce changes in the beach and nearshore bathymetry. These changes can occur very rapidly in response to storms or slowly as a result of persistent but less forceful seasonal variations in wave and current conditions. 58. Nearshore bathymetry at the FRF is characterized by regular shore- parallel contours, a moderate slope, and a barred surf zone (usually an outer storm bar in water depths of about m and an inner bar in water depths between and m). This pattern is interrupted in the immediate vicinity of the pier where a permanent trough runs under much of the pier, ending in a scour hole where depths can be up to m greater than the adjacent bottom (Figure 22). This trough, which apparently is the result of the interaction of waves and currents with the pilings, varies in shape and depth with chang- ing wave and current conditions. The effect of the pier on shore-parallel contours occurs as far as 300 m away, and the shoreline may be affected up to 350 m from the pier (Miller, Birkemeier, and DeWall 1983). FRF Pier £ ,*. Figure 22. Permanent trough under the FRF pier, 8 July 1988 49. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leffler, Michael W; United States. Army. Corps of Engineers; Coastal Engineering Research Center (U. S. ); U. S. Army Engineer Waterways Experiment Station. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : Available from National Technical Information Service]
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