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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Baird

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

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evel

(ft,

LWD)

MIKE 21 Modeled Water LevelActual Water Level

Baird

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

Baird

Vegetation Analysis

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Physical Modeling

• Test Beach Profiles & Revetment Stability of Locally Available Products

Baird

Concept Plans • Beach / Revetment

Systems• Stay in Footprint• Increase Capacity

while Providing Desired Habitat

Baird

Design Development Plan

• Revetment / Coarse Gravel-Cobble Beaches on Exposed Side

• Dredged Material Beaches on Protected Side

Baird

Questions