pathway is seen In profile line 5 (Fig. 15). Although the dune continued to 

 accumulate sand both seaward and landward of the north-south pathway, the 

 elevation of the path remained constant over the 5-year period from 1973 to 

 1977. 





\- SHORELINE POSITION 





VERTICAL 



DATUn IS OSl. 





HORIZONTAL DATUM IS 





BASE 



LINE 



Foot and Vehicuior 

 Polhwoy 







J^a^ 



X 



DATE 



9N0V77 



t6EP75 



12JUN73 



lflPR70 



9 \ 



\ 



Seaward »- 



^ 







-100 



n 50 



OISTfil'ICE ( fl) 



150 



200 



Figure 15. Surveys of profile line 5 at plot 3 (American beachgrass). 



b. Short-Term Dune Growth . By the end of the second growing season 

 (October 1972), an average of 31.3 cubic meters per meter had accumulated in 

 the planting area. Much pf this material was deposited by waves rather than 

 by the wind. Crest elevation of the dune was 4.1 meters, 1.1 meters above the 

 original planting surface. 



c. Long-Term Dune Growth . An average of 51.3 cubic meters per meter of 

 sand had accumulated by November 1977. Crest elevation was 4.6 meters MSL, 

 1.5 meters above the original planting surface, and the base width of the dune 

 averaged 81.7 meters. The landward and seaward slopes were 1 on 21.2 and 1 on 

 29.7, respectively. The landward shore remained relatively stable during the 

 study period; the seaward shore retreated about 15.0 meters over the 8 years. 



d. 

 plot 3. 



Performance Summary. Table 5 summarizes growth characteristics for 



4. Straight Fence (Plot 4) . 



a. Installation, Damage, and Repair . A single, straight sand fence was 

 constructed in plot 4 in April 1970. Additional lifts of fence were con- 

 structed in January 1971 (second lift), April 1971 (third lift), and January 



23 



