10. Unit voliime change 

 (storage change) 



11. Storage change rate 



12. Beach width 



13. Shoreline 



14. Mean monthly unit 



volume (profile line) 



15. Change in mean monthly 

 unit volume (profile 

 line) 



The difference between unit volumes measured by 

 two surveys. If the landward end of one or both 

 profiles does not reach the vertical line defined 

 as the landward bound of the profile area, the 

 landward bound is redefined to be a vertical line 

 through the seawardmost of the landward ends of 

 the two profiles. 



AV(p,t,t^) 



V(p,t) - V(p,t^) 



Unit volume change divided by time between surveys. 



The horizontal distance on a beach profile from 

 the shoreline to the base of the frontal dune or 

 bulkhead. Where the survey did not cross either 

 dune or bulkhead, that profile was deleted. 



The MSL contour (in this paper) . This contour 

 was extrapolated, as necessary, from the seaward- 

 mos'L line segment which crossed at least the 

 +2 -foot contour. 



The average unit volume on the beach in a given 

 month, obtained by adding the unit volumes from 

 all surveys of the given profile line in the given 

 month (regardless of year) and dividing by the num- 

 ber of surveys . 



1 - .„ ., 



V(p,t ) = 



H vfP'^. 



The difference between (14) calculated for the 

 given month and (14) calculated for the previous 

 month. 



~ J = V(p,t ) - V(p,t - 1) 



^^(P'^^'V 



16. Mean monthly unit 

 volume (locality) 



17. Change in mean monthly 

 unit volume (locality) 



18. Mean monthly shoreline 

 position (profile 

 line) 



The average of mean monthly unit volumes at a pro- 

 file line (definition 14) for all profile lines at 

 the locality, weighted by the distance between 

 profile lines. 



Difference between mean monthly unit volumes 

 (definition 16) calculated for 2 successive 

 months . 



The average shoreline position in a given month, 

 obtained by adding the shoreline positions from 

 all surveys of the given profile in the given 

 month (regardless of year) and dividing by the 

 number of surveys . 



1 



MSL(p,t^) 



N ^^ 



E. MSL(p,t .) 



19. Change in mean monthly The difference between (18) calculated for the 



shoreline position given month and (18) calculated for the previous 

 (profile line) month. 



AMSL(p,t^,t„ 



.^) = MSL(p,t^) - MSL(p,t^_j) 



102 



