££BL9M££PM£nL Ph usical EnvJronmenf 



Poge no : 



Calculoted by: 

 Checked by: 



Date 



4/ of /33 



n.r-r.T 



7 Mar 73 



Wove Conditions on Ocean Side of Island (cont) 

 Tif picQl Refraction Calculations 



Depth at structure: Use 4o.oft 



Shoalin g coefficient 



^^ Hi 



r 



coth C-^) 



I f 



4ird/i. 



eq.uivalentl(jj 



~ 1^1 



K, 



Refraction coefficient and angle 



c 

 sino( = —r sinoio 



Co 



Note: E<^uafion 2-lta is written bet\N(sen 

 deep \Nater and d= 4oft since 

 bottom contours^ and shoreline tiave 

 been assumed stra'igtit and parallel. 



For straight parallel botiom contours 

 the expression for the refraction 

 coefficient reduces to: 



'H-^H-^^f 



Recall, 



iir 



(deep v^ater) 



and 



±-±= tanhf^ 



£q. 2-U 



Eq. 2-76Q 



Eq.2-& 



Eq. 2-U 



Typical refraction -shoaling calculations are given 

 on the next page. Calculations for various 

 directions and for a range of periods follo)^. 



8-41 



