

CD 



z 

 o 



1.030- 

 1.D29 

 I.Q2B- 

 1.027' 

 1.026 

 1.025 

 1. 024 

 1.023 

 1.022 

 1.021 

 1.020 

 1.019 

 t.018 

 1.017 

 1.016 



RmUTL 81-83 



0.01 0.10 1.00 10.00 25.00 50.00 75.00 90.00 

 PERCENT BRERTER THAN 



99.00 99.90 99.99 



Figure 41. Distribution of surface water density 

 for 1981 through 1983 



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. 



102. To document the temporal and spatial variability in bathymetry, 

 surveys were conducted approximately monthly in an area extending 600 m north 

 and south of the pier and approximately 950 m offshore. During January, May, 

 July, and November, 24 profile lines were surveyed, while the remaining sur- 

 veys consisted of approximately 15 profile lines each. In addition, soundings 

 were taken on both the north and south sides of the pier. 



103. A brief discussion of the effect of the research pier on the 

 bathymetry precedes discussions of time-histories of bottom elevations at 

 selected locations along the pier and contour diagrams of the bathymetry. 

 Pier effect 



104. The research pier introduces a perturbation in bathymetry (Fig- 

 ure 42) in the form of a permanent trough under the pier, apparently a result 

 of the interaction of waves and currents with the pilings. The trough deepens 

 under the seaward end of the pier and varies in shape and depth with changing 

 wave and current conditions. The pier's effect on shore-parallel contours 



66 



