Accession Number : AD0748817

Title :   Seiches and Currents in Duluth-Superior Harbor June-November 1958.

Descriptive Note : Analytical investigation,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Housley,J. G. ; Brasfield,C. W.

Report Date : JUN 1962

Pagination or Media Count : 73

Abstract : Records of current velocity and water-surface elevation obtained from eight gages in Duluth-Superior Harbor were analyzed to establish whether seiches in the harbor and in Lake Superior are responsible for the high-velocity currents in the entries to the harbor that are hazardous to shipping. It was concluded from the analysis of the stage and current records that: hazardous currents in the entrance channels are caused by Lake Superior seiches with periods greater than the fundamental resonant period of a free oscillation in the harbor; no independent seiche oscillations occurred in the harbor during the period of record; the current-velocity indicators in use during the period of record did not reflect, reliably, the mean, mid-channel velocity; and it was impossible to determine whether there is a correlation between current magnitude and direction in the entrance channels and ship-maneuvering difficulties because of a lack of data.

Descriptors :   (*GREAT LAKES, HARBORS), (*HARBORS, HAZARDS), MARINE TRANSPORTATION, OSCILLATION

Subject Categories : Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE