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Ecological Risk Assessment of Underwater Sounds from Dredging Operations.

Andrew D McQueen¹, Burton C Suedel¹, Christ de Jong²

¹US Army Corps of Engineers, Engineer Research and Development Center, Vicksburg, Mississippi.

Integrated Environmental Assessment and Management

|March 10, 2020

Summary

This study presents a practical framework for assessing ecological risks from dredging sounds on aquatic life. It details a phased risk assessment approach, emphasizing uncertainty communication for better environmental management.

Keywords:

Dredging Risk assessment Risk framework Sound pressure level Underwater noise

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Area of Science:

Environmental Science
Acoustic Ecology
Risk Assessment

Background:

Growing international concern exists regarding ecological risks of anthropogenic underwater sounds.
A risk-based approach for dredging operations is proposed but lacks detailed frameworks and practical demonstrations.

Purpose of the Study:

To provide a practical, concise, and reliable framework for assessing dredging sound impacts on aquatic life.
To specify a risk assessment approach for underwater sounds from dredging.
To demonstrate the framework's utility with a case study and document its strengths and challenges.

Main Methods:

Adapted a risk framework for underwater sounds, including project formulation, exposure and biological response analysis, risk characterization with uncertainty assessment, and risk management.
Employed a phased approach with a screening step using available information.
Included a case study for practical illustration.

Main Results:

The framework integrates project formulation, analysis, risk characterization, and management steps.
A phased approach with a screening step allows for efficient initial risk evaluation.
The case study demonstrated the framework's practical application.

Conclusions:

The developed framework offers a flexible and adaptable method for assessing dredging sound impacts.
Emphasizing documentation and communication of uncertainty is crucial for decision-making.
The approach is valuable for managing ecological risks in underwater acoustic environments.