Design Problem PreliminQrLj Desi gn 



Poqe no : 



Ccilcitlated b;» 

 Checked by; 



Dale : 



95 Of 132 



J. R. W. 



IS Mar. 73 



Diffraction Anal q sis (cont) 



From Fiqure 2-33, for u = Z.7, the required 

 X to give /<'= O.095 L..^^ 



x= 7.0 \NQve lenaihs >J^^^ 



or^ ' "'To^ 



y- 7.0iZ23) = /^6/ ft 



Required breakv^ater Lengft) = 1560 ff. 



A similar aholLjSis is required to deter- 

 mine the length of Ihe breok.\Nater on fhe 

 ocean side of fhe inland. 



Preliminary Design of Quay Wall Caisson 



Since Quay \niII be protected txj 

 breakwaters after construction is complete^ 

 caisson v^ill experience exfreme v^ove action 

 only during construction. For illustrative 

 purposes the folloii^ing conditions will be 

 used to evaluate the stability of the 

 caisson against tvave action. It should be 

 noted that these conditions have a low 

 probability of occurrence during construct- 

 ion. 



H^^ 9.9ft 



Hi^ 14.^ ft 



^ = 6.6sec. 



* d = ^O.O -hG.O ft 

 d -= 4(i ft 



* Probability of extreme surge during construct- 

 lon assumed n e gligible. 



Fig. 2-33 



8-95 



