Cat Island Chain Restoration, Green Bayweb4.uwindsor.ca/.../$FILE/NairnCatIsland3.02.pdf ·...
Transcript of Cat Island Chain Restoration, Green Bayweb4.uwindsor.ca/.../$FILE/NairnCatIsland3.02.pdf ·...
Baird
Cat Island Chain Restoration, Green Bay
January 27, 2005
Baird
Project Objectives• Re-establishment of emergent
and submerged aquatic vegetation southwest of the Cat Island Chain
• Restoring terrestrial habitat associated with the islands
• Providing capacity for placement of clean dredge spoils of Green Bay Federal Navigation Channel dredging activities
Baird
Project Overview
• Field Investigations• Geomorphic Analysis• Numerical Modeling of
– Waves– Hydrodynamics– Sediment Transport
• Vegetation Analysis• Physical Modeling• Design Development Plan
Baird
Field Investigations• Bathymetric Survey• Sediment Samples• Wave Gauge
Long Tail Point Gauge
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pr
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e H
eigh
t (m
)
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e Pe
riod
(s)
Hm0Tp
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Geomorphic Analysis• 1965 • 2000
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Wave Modeling
• WAVAD– Wave
Generation
• STWAVE – Wave
Transformations
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Hydrodynamics
• Nested MIKE 21 Model• Bathymetry
– 500m, 180m, 60m, 20m
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Hydrodynamics
• Calibration, Results
Green Bay Surge Event December 3, 1990
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30-Nov 1-Dec 2-Dec 3-Dec 4-Dec 5-Dec 6-Dec 7-Dec
Date
Wat
er L
evel
(ft,
LWD)
MIKE 21 Modeled Water LevelActual Water Level
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Sediment Transport Analysis• MIKE 21- MT Module
Existing East Island
West Island Proposed
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Sediment Transport Analysis
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Vegetation Analysis• Aquatic vegetation survival criteriaExisting East Island
Depth < 2 * Secchi Depth
Orbital Velocity < 0.6 m/s
1. Baird & Associates (1996a).
Approach to the Physical Assessment of Developments Affecting Fish Habitat in the Great Lakes Nearshore Regions. Can. Manu. Rep. Fish. Aquat. Sci. 2352: v + 96 pp.
2. Baird & Associates (1996b). Defensible Methods of Assessing Fish Habitat: Physical Habitat Assessment and Modellingthe Coastal Areas of the Lower Great Lakes. Can. Manu. Rep. Fish. Aquat. Sci. 2370: vi + 95 pp.
3. Minns, C.K. and Nairn, R.B. (1999). Defensible Methods: Applications of a procedure for assessing developments affecting littoral fish habitat of the Lower Great Lakes. In Aquatic Restoration in Canada. Backhuys Publishers. Ed. T. Murphy.
West Island Proposed
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Vegetation Analysis
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Physical Modeling
• Test Beach Profiles & Revetment Stability of Locally Available Products
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Concept Plans • Beach / Revetment
Systems• Stay in Footprint• Increase Capacity
while Providing Desired Habitat
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Design Development Plan
• Revetment / Coarse Gravel-Cobble Beaches on Exposed Side
• Dredged Material Beaches on Protected Side
Baird
Questions