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The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.
Analyzing the St. Marys Rapids for Suitable Fish Habitat: An Engineering with Nature® Demonstration Project
Timothy J. Calappi, Katherine A. Labuhn, Patrick S. Fowler, Burton C. Suedel, Justin L. Wilkens, Gaurav Savant, Marianne Bachand, and Guillaume Guénard
The St. Marys rapids at the outlet of Lake Superior is a vital habitat for a wide range of aquatic species. The regulation of the outflows from Lake Superior by Compensating Works (i.e., a series of control structures) can lead to rapid changes in hydraulic characteristics, potentially creating adverse conditions for downstream biota. To accomplish more naturally varying flows, the U.S. Army Corps of Engineers (USACE) Detroit District (LRE) is constructing four remotely operated gates on the United States (U.S.) side of the Compensating Works. The gates will be capable of being opened slowly (over many hours) until a desired discharge is achieved. A two-dimensional (2-D) model was developed to evaluate multiple scenarios and analyze the total area available for fish spawning based on depth and velocity associated with a particular gate setting. The model also addressed the recommendation for water level rates of change associated with gate changes, suggesting that water level rates of change be held to less than 10 centimeters (cm)/hour to avoid stranding juvenile fish. This is consistent with Engineering With Nature® (EWN) principles of maximizing habitat value of the rapids while maintaining water regulation objectives.
101 pgs / 22 mb
ERDC is a diverse research organization with approximately 2,000 employees operating more than $1 billion in world class facilities at seven laboratories. Its annual program exceeds $1 billion as it supports the Department of Defense and other agencies in military and civilian projects. Principal research areas include Soldier support, Engineered Resilient Systems, Environmental Quality and Installations, Geospatial Research and Engineering, Military Engineering, and Water Resources. “Discover ▪ Develop ▪ Deliver” ERDCinfo@usace.army.mil
Release no. 19-099