October 16, 2025

Tidal flow masks acoustic detections of harbour porpoises (Phocoena phocoena): Implications for passive acoustic studies of cetaceans.

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Observational analysis reveals flow noise impacts echolocation click detection in harbour porpoises, suggesting ecological bias.

Flow noise in tidal habitats can vary by up to 29 dB, potentially masking echolocation signals.
Detection ranges for harbour porpoises are significantly affected by flow noise across tidal cycles and small distances.
Data was collected from an array of moored recorders in a tidal stream environment to assess noise impacts.
Understanding flow noise is essential for accurately estimating cetacean occurrence, especially for tidal energy assessments.

Veneruso et al. (2025) studied this question.

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