\- SHORELINE POSITION 

 VERTICAL DflTUM IS HSL 

 HORIZONTfiL DHTUn IS 

 BASE LINE 



60 



OISTHNCE I n) 



Figure 20. 



Surveys of profile line 9 at plot 5 

 (American beachgrass). 



Table 7. Growth characteristics of American beachgrass 

 planting, plot 5 (90-centimeter spacing) , 

 1970-77, 



Parameter 



Time interval by 

 growing season 



Value 



Sand accumulation 



1 

 One 



Two 2 



-3.8 m3/m 



or loss 



10.0 m3/m 





Seven 



55.0 mVm 



Increase in 3 



One 



0.8 m 



crest elevation 



Two 



0.9 m 





Seven 



2.0 m 



3 

 Dune slope 







Landward 



Seven 



1 on 8.7 



Seaward 



Seven 



1 on 9.8 



3 

 Base width 



Seven 



96.3 m 



•^Volume calculated for area 23 meters landward and seaward 

 of plot centerline; average of profile lines 9 and 10. 



Volume calculated for area 30.5 meters landward and seaward 

 of plot centerline; average of profile lines 9 and 10. 



^Average of profile lines 9 and 10. 



28 



