Seiches and Currents in Duluth-Superior Harbor June-November 1958.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1962
- Accession Number
- AD0748817
Entities
People
- C. W. Brasfield
- J. G. Housley