Design Problem RnshminQru Desi gn 



Pogc nc : 



r-t.koo by 



33 of /33 

 c/. /?. W. 



13 kAar. 73 



Diffraction Around break watGr 



For purposes of this problem, establish 

 the required breakwater length so that 

 the maximum wove, height m the harbor 

 is 3 ft when the - incident wa ve he'ighi is 

 14.^ ft (1% wave for H^^ 8.9 ft) and the 

 period IS T^e.esec. Assume normal 

 incidence^ waves generated in Delaware 

 day. 



Direction of wove approacti 

 ' ' ^dreaki^a ten 



Diffracted nvove height at A is to be less 

 than 3. ft for an incident wave with 



H,= I4.9ff. 

 T ' 6.6sec. 



^^ 2 (3./4/(.) 



Depth at breakwater: 

 Depth in basin: 



d^ 5Gft 

 d = to(^ ft 



U 



foc 



= 0.47S' 



ZZ3.2 



From Appendix C, Table C-i^ 



:. L'^Lo^ 2Z3 ft 



f = 0.47r 



Sect 2.4. 



^9 



.2-d 



AppendixC 

 Table c-i 



8-93 



