BOGUE BANKS 



•AV B =? 



-»-4i5.S 

 — 98.3 



32 



ATLANTIC 



o Cs ^ 



4/\, 



B E = 143.6 

 AV B = 141.9 



Figure 26. Weir-jetty construction sediment budget for strategy 2. 



the assumptions made under this strategy since the weir will stabilize the 

 updrift beach and any excess sand will be transported over the weir into the 

 deposition basin where it will eventually require dredging. 



c. Strategy 3 . A third strategy (Fig. 27) might distribute losses or 

 gains equally over both updrift and downdrift beaches, i.e., A¥- g = A¥g. 

 (Another possible alternative is to equalize beach recession or accretion 

 rates.) The Bogue Banks equation is then 



415.8 (gain from west) - 98.3 (loss to west) 



- 32 (lost offshore) - B £ = A¥g 



and the Shackleford Banks equation is 



Bg - 223.0 (loss to east) + 79.4 (gain from east) 



- 33 (lost offshore) = AV g = AVg 



and the solution is 



Bg = 231.0 and A¥ g = A^ B = 54.5 



BOGUE BANKS 



-♦-415.8 

 — 98.3 



B E = 231.0 T 

 AV e =54.5 32 

 flv s =545 ATLANTIC 



Figure 27. Weir-jetty construction sediment budget for strategy 3. 



46 



