Table 50. Area of barrier environments, New North Beach. 



Year Dines Washovers Marshes Shrubs Sandy Total 



shorelines supraeldal 



(_ha) (pet; 1 (ha) (pet) (h a ) (pet) (ha) (ha) (pet) (ha) (pet) 



1851 274. U l 



1 8Kb 0.0 7 



1938 91.1 



1952 71.6 -21 



1978 11)7.1 +50 



Overall -33 2 



chanp.e 



274. 6 2 





20.7 





0.0 



85.5 





380.8 





0.0 2 





0.0 





0.0 



90.7 



+6 



90.7 



-76 



20.7 





16.8 





0.0 



114.0 



+26 



242.5 



+ 167 



82.9 



+300 



15.0 



-11 



2.6 



51.8 



-55 



223.9 



-8 



77.7 



-d 



14.7 



-2 



0.0 



36.3 



-30 



235.8 



+ 5 



1 Inrrease and decrease In hectares. 



''The 1851 and 1886 maps do not differentiate dunes and washovers. 



eastward; a total of 1100 meters was added to the length of the spit at a rate 

 of 78 meters per year. The shoreline eroded very rapidly along the oceanfront 

 of New North Beach (fc.2 meters per year) during this period. Erosion also 

 occurred along the bay shoreline, as tidal currents reworked the broad 1938 

 spit terminus. The barrier environment eroded 34.9 hectares along the ocean- 

 front and 47.7 hectares along the bay side (Table 51). The average barrier 

 width narrowed from 626 meters in 1938 to 445 meters in 1952 *. Table 43). 



Table 51. Location of changes in total bar- 

 rier atea calculated from serial 

 map overlays. New North Beach. 





Year 



Bay sho 



reline 



Ocean 



front 



SDtt 



teralnua 





(ha) 



Cain 

 (ha) 



U>SH 



(ha) 



Cain 



Loss 

 (la) 



Gain 



(ha) 



1851 



to 1886 











380.9 















1886 



to 1938 



5.2 



5.2 



77.7 



0.0 



0.0 



228.0 



19)8 



to 1952 



47.7 



0.5 



34.9 



0.0 



0.0 



63.3 



!9'2 



to 1978 



13.5 



15.5 



83.8 



0.0 



0.0 



93.7 



H51 



:j 197S 



66.-. 



21.2 



575.8 



0.0 



0.0 



3S5.2 



Net- 





45.2 





575.3 







385.2 



•Net 

 Set i 



loss for e.itlre aectioi 

 aln for entire section. 



>. 1851 : 

 1886 to 



o 1978, 

 1979. - 



- 235. 



145.1 



8 hectares 

 hectares. 



Although I 100 meters was added to the length of the spit, the total Kind 

 area actually decreased by 8 percent (Table 50). The total d-ne area decreased 

 by 21 percent between 1938 and l')52. Dunes on New North Beach develop and 

 erode very rapidly. Ot the c ! 1 hectares of dunes in 1 ( )JS, only 27 percent 

 remained in l l )52 (Table 52). Along the oceanside, 32.6 hectares of dunes 

 eroded and 20.2 hectares of dunes were destroyed by overWash'. New dunes 

 (44.2 hectares) developed on washovers (46 percent) and at the spit terminus 

 (27 percent). 



181 



v- 



