Civil Works Value to the Nation, 2020 Edition

Page 42

DREDGING IMPACT ON ATLANTIC STURGEON MIGRATION Many states have implemented time-of-year restriction windows on federal dredging projects to avoid potential dredge-related risks to sensitive biological resources or habitats. Currently, states along the East Coast have established environmental windows for fish that migrate from salt water to spawn in fresh water. This includes the federally endangered Atlantic Sturgeon (ATS). Since 2012, several studies have documented that ATS spawning occurs during both spring and fall within distinct river systems. The discovery of multiple spawning seasons has resulted in modifications to existing ATS population-monitoring strategies and has raised concerns with state and federal agencies with respect to expanding protection of migratory fish into the fall months. Although dredging is listed as a threat to ATS recovery, there are limited data on the dredging effects and on ATS movement near a dredge. The Corps has conducted a novel field study using acoustic telemetry to determine how adult ATS, migrating to spawning habitats, move around an active dredge. Using fine spatial-scale data to characterize ATS movements around an operating dredge is critical to determining whether environmental windows are necessary to protect spawning ATS from dredging activities.

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Navigation Improvement Monitoring

1min
pages 52-53

River Hydraulics Model Quantifies Flooding Impacts

1min
pages 50-51

Risk Management Center-BestFit

1min
pages 48-49

Coastal Storm Modeling System

2min
pages 46-47

U.S. Coastal Research Program

2min
pages 44-45

Dredging Impact on Atlantic Sturgeon Migration

1min
pages 42-43

Engineering With Nature to Produce Horizontal Levees

2min
pages 40-41

Delisting the Interior Least Tern

1min
pages 38-39

Seven Mile Island Innovation Laboratory

1min
pages 36-37

Coastal Zone Mapping & Imaging LIDAR

2min
pages 32-33

Microbotic Infrastructure Assessment

2min
pages 34-35

Electric Fish Dispersal Barriers

2min
pages 30-31

Mini-Argus Nearshore Video Imaging

2min
pages 28-29

High-Resolution Monitoring of Nearshore Morphologic Change

2min
pages 26-27

Radar Inlet Observing System

1min
pages 24-25

Nearshore Nourishment & the Sediment Mobility Tool

2min
pages 22-23

Fiber Reinforced Polymer Composite Materials

2min
pages 16-17

Sediment Budget Analysis System

1min
pages 20-21

Efficient Solution for Fish Movement at Locks

2min
pages 14-15

ADCIRC

1min
page 10

Reliability Analysis of Coastal Rubble Mound Structures

2min
pages 18-19

Collaboration Benefits the Nation

1min
pages 11-12

Ship/Tow Simulator

1min
page 9
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