PREFACE 



This report presents a method for predicting the stable (self-maintaining) 

 cross-sectional area and shape of a navigation channel between a landlocked 

 harbor and open waters. Channel scour is assumed to result from the flow of 

 water between the harbor basin and the adjacent, tidally controlled estuary or 

 open ocean. Sedimentation in the channel is assumed to be controlled by the 

 deposition of fine-grained material from suspension. Bedload sediment trans- 

 port is considered to be minimal. Channel shape is a function of the sediment 

 through which the channel is dredged, the tidal prism in the channel, and the 

 depositional characteristics of the suspended sediment carried into the channel. 

 An example of the method is given for a high tidal range (6 meters) , sediment- 

 laden (200 to 1,000 milligrams per liter) Alaskan harbor where the channel is 

 cut through compacted silts and muds. This report is extracted from a paper by 

 Everts (1977). The work was carried out under the coastal engineering research 

 program of the U.S. Army Coastal Engineering Research Center (CERC) . 



The report was prepared by Craig H. Everts, Chief, Engineering Geology 

 Branch, under the general supervision of N.E. Parker, Chief, Engineering Devel- 

 opment Division. 



Comments on this publication are invited. 



Approved for publication in accordance with Public Law 166, 79th Congress, 

 approved 31 July 1945, as supplemented by Public Law 172, 88th Congress, 

 approved 7 November 1963 . 



iD E. BISHOP 

 Colonel, Corps of Engineers 

 Commander and Director 



