Table 9 

 Annual and Monthly Mean Longshore Surface Current 









Speed 



(cm/sec) 



and Dir 



ection* 













Beach 





P: 



Ler Midsurf 





Pier End 





Month 



1983 



81-82 



81-83 



1983 



81-82 



81-83 



1983 



80-82 



80-83 



Jan 



25 



14 



17 



24 



21 



22 



27 



17 



20 



Feb 



16 



10 



12 



20 



6 



10 



33 



24 



26 



Mar 



11 



8 



9 



5 



4 



4 



15 



19 



26 



Apr 



14 







4 



19 



-13 



-5 



14 



9 



10 



May 



-4 



-3 



-3 



-20 



9 



-12 







11 



8 



Jun 



-5 



-12 



-10 



-7 



-20 



-17 



4 



6 



6 



Jul 



-14 



-16 



-16 



-25 



-20 



-21 



3 



4 



4 



Aug 



-5 



-10 



-9 



-33 



-8 



-14 



5 



8 



7 



Sep 



19 



-7 



-1 



14 



-10 



-4 



18 



11 



13 



Oct 



1 



14 



4 



5 



11 



10 



18 



10 



12 



Nov 



1 



17 



13 



-1 



15 



11 



4 



14 



12 



Dec 



7 



11 



10 



17 



19 



19 



12 



11 



11 



Annual 



6 



2 



3 



2 



-1 







13 



12 



12 



* A minus sign indicates currents flowed northward. 



1983 versus previous years 



83. Longshore surface currents for 1983 were reasonably consistent with 

 previous years of data (Figures 26-28). However, at the midsurf location, the 

 monthly means were directed to the south in response to storm waves during 

 April and September. 



All years combined 



84. All locations show consistent temporal variations and distinct 

 spatial differences in both magnitude and direction (Figure 29)- Near-zero 

 annual means (Table 9) for both locations within the surf zone reflect the 

 seasonal variations and frequent reversals caused by the varying wind and wave 

 conditions at the FRF. These contrast with the predominantly southward cur- 

 rents at the pier end. 



Tides and Water Levels 



85. Water level variations caused by astronomical and meteorological 

 forces are discussed in this section. Results for 1983 are followed by a 

 comparison with previous data. All tidal heights are referenced to the local 

 1929 NGVD unless otherwise stated. 



53 



