NOMOGRAPH FOR DETERMINING PRODUCT OF 
SHOALING AND REFRACTION COEFFICIENTS 
FOR USE IN WAVE ANALYSIS 
by 
R. Q. Palmer 
Chief, Planning and Reports Branch 
U. S. Army Engineer District, Honolulu 
Description of the Nomograph 
The nomograph shown on the adjacent page may be used 
to readily calculate the combined effects of shoaling and 
refraction for a given wave period and depth. The shoaling 
coefficient alone may be obtained by using the left third 
of the chart. Likewise, the square root of the bo/b value 
may be obtained alone by using the right portion of the 
chart. However, the chart is most helpful when used, as 
shown by the example, to obtain the product of the shoaling 
and refraction coefficients. This value is useful in deter- 
mining wave height values at a specific location in shallow 
water when the deep water height (Ho) iS available from 
other means, as by statistical -hindcasting. 
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