Ship Maneuvering in Deep and Confined Waters 



Wp-y. Vfe-yo 



___J ^^^'^^^^^^^^^ 



Fig. 26. Ship moving parallel to walls in a straight canal 



The depth h Is considered constant between the bed lines. 

 The mean width Z'W is defined as the quotient between cross 

 section area Aj. and depth h. The ratio 2W/B is a better parana- 

 eter for width-to-beam relations the more shallow is the canal. 

 For use with theoretical results for thin ships the width parameter 

 will here not be related to beam but to ship length L. 



As seen from Fig. 27 the bank and ship positions may be 

 given by coordinates normal to a datum line essentially parallel to 

 the main direction of the canal. The orientation of the ship is given 

 by the heading angle i|j, measured from the same datum line. The 

 basic geometric parameters are defined as 



Under-keel clearance parameter t, = T/(h - T) 

 Port bank distance parameter rip = L/(Wp - yo) 



St'bd bank distance parameter r\^ - I-/(Wg - y,,) 



(10.1) 



877 



