Muriel Dunn

Muriel Dunn

I study ocean acoustics and fisheries sciences. I am interested in oceanographic instrumentation, physics and the ocean.

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Pages

Posts

The Arctic after dark: a secret world of hidden life

less than 1 minute read

Published:

Article about Deep Impact campaign in Svalbard in January 2023 published in Nature written by journalist, Randall Hyman. I was part of a large campaign studying the effects of the polar night on various arctic ocean species. My PhD research with mesocosm (AZKABAN/AFKABAN) is summarized.

portfolio

AZKABAN-light 2022

During my PhD I lead a field campaign, AZKABAN-light (Arrested Zooplankton Kept Alive for Broadband Acoustic Net light experiment) during which we built a purpose-built mesocosm species for acoustic experiments in Ny-Ålesund, Svalbard during the polar night in January 2022. Fieldwork collaboration with Chelsey McGowan-Yallop and Stig Falk-Petersen. Photo taken by Malin Daase.

Master’s fieldwork 1

The frame before being deployed for a month in the Bay of Fundy and the team who help deploy, prepare and build it. Grand Passage, September 2018. (Left to right: Len Zedel, Greg Trowse, Mark Downey, Muriel Dunn and Richard Cheel.)

Drifter fieldwork

Deploying eight drifters to study tidal currents and estuarine residence times in Grappler Inlet, Bamfield, BC during Bachelor final year project (February 2015). Left to right: Muriel Dunn and Mark Halverson.

publications

Development of acoustic Doppler fish monitoring for applications in high-energy tidal channels

Published in Underwater acoustics conference and exhibition, 2019

Detecting fish in ADCP measurements using coninciding incidences of high phase correlation and high intensity.

Recommended citation: Dunn, M., Zedel, L., Trowse, G. (2019). "Development of acoustic Doppler fish monitoring for applications in high-energy tidal channels". UACE2019-Conference Proceedings. https://www.uaconferences.org/docs/Past_Proceedings/UACE2019_Proceedings.pdf

Developments in fish detection using broadband acoustic doppler current profiler

Published in Memorial University of Newfoundland Library, 2019

This thesis presents results from a 600 kHz RD Instruments Workhorse ADCP alongside a 120 kHz BioSonics DTX Submersible Split-Beam Echosounder system and contrasts their capabilities in the context of fish monitoring in high-energy tidal channels.

Recommended citation: Dunn, M., 2019. Developments in fish detection using broadband acoustic doppler current profiler (Masters dissertation, Memorial University of Newfoundland). https://research.library.mun.ca/14340/1/thesis.pdf

Report - Data from the BREA-MFP and CBS-MEA research programs describing the Anguniaqvia niqiqyuam Marine Protected Area (ANMPA) ecosystem

Published in Canadian data report of fisheries and aquatic sciences, 2020

The conservation objectives of the Anguniaqvia niqiqyuam Marine Protected Area (ANMPA) focus on maintaining the integrity of marine habitats offshore of the Cape Parry Migratory Bird Sanctuary that support populations of key species, such as beluga whales, Arctic Char, and ringed and bearded seals. This report provides ecosystem-level scientific knowledge to support the development of monitoring objectives and activities.

Recommended citation: Niemi, A., Majewski, A., et al. (including Dunn, M.) (2020). Data from the BREA-MFP and CBS-MEA research programs describing the Anguniaqvia niqiqyuam Marine Protected Area (ANMPA) ecosystem. Can. Data Rep. Fish. Aquat. Sci. 1316: ix + 90 p. https://publications.gc.ca/site/eng/9.892324/publication.html

Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey

Published in Canadian Journal of Fisheries and Aquatic Sciences, 2023

This paper presents the inverse method applied to broadband autonomous acoustic surveys. We conclude the inverse method can improve density estimates of epipelagic organisms by diminishing avoidance biases and increasing the spatio-temporal resolution of ship-based surveys.

Recommended citation: Dunn, M., Pedersen, G., Basedow, S.L., Daase, M., Falk-Petersen, S., Bachelot, L., Camus, L. and Geoffroy, M., 2022. Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey. Canadian Journal of Fisheries and Aquatic Sciences. https://doi.org/10.1139/cjfas-2022-0105 https://cdnsciencepub.com/doi/abs/10.1139/cjfas-2022-0105

talks

teaching

Physics Lab Course - Teachers Assistant

Course, University of British Columbia, 2014

Teacher’s assistant for enriched physics lab classes for first-year bachelor students. The students explored physics and statistical analysis through experiments and coding. I insturcted and guided students to an understanding of physics through socratic questioning. I marked lab assignments and provided feedback.

Software Carpentries Shell/Git/Python

Workshop, University of Bergen (online), 2021

This 5-day workshop covered Git, Unix Shell and Plotting and Programming with Python I, II and III with hands-on teaching.