6 3 



2 - 



I 



30 



40 



50 60 



(n.) 

 Oistonce from bose line 



70 



80 



Figure 6-29. Sand accumulation by a series of three double-fence lifts, 

 Outer Banks, North Carolina (Savage and Woodhouse, 1969). 



- 10 



L 



20 



40 



60 



100 

 Ifl) 



120 



140 



200 



-L. 



_L- 



20 30 



(m) 

 Dislonce from Bose Line 



50 



60 



Figure 6-30. 



Sand fence dune with lifts positioned near the crest. Padre 

 Island, Texas. 



6-42 



