Seiches and Currents in Duluth-Superior Harbor June-November 1958.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
Pagination or Media Count:
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.
- Hydrology, Limnology and Potamology