Q_ 

 Ld 

 Q 



DISTANCE 

 (m) 



238 



323 

 433 



579 



MONTH 



Figure 45. Time-history of bottom elevations at selected locations 

 under the FRF pier 



resulting from the interaction of the pier piles with waves and currents. 

 Throughout the year the scour hole at the seaward end of the pier varied ap- 

 proximately 0.9 m, which is relatively low in comparison to some prior years 

 when the variation was observed to exceed 2 m in a year. 



90. After an initial deepening of 0.8 m in February, at the 238-m dis- 

 tance, sediment slowly accumulated until September when it was again near 

 -2.4 m. Hurricane Gloria in September caused 1.4 m of erosion. During this 

 time, 0.8 m of scour was measured at the seaward end of the pier. 



Bathymetry 



91. Contour diagrams created from the data obtained during the bathy- 

 metric surveys are presented in Appendix A; change diagrams showing major 

 areas of erosion and accretion in the survey area are also presented. Profile 

 lines surveyed are indicated on each contour diagram. 



67 



