Calder, Brian R.

Pirtle, Jodi L

Rooper, Chris

Weber, Thomas C.

Wilson, Christopher D

English

UNH Scholars' Repository

University of New HampshireUniversity of New Hampshire Scholars' RepositoryCenter for Coastal and Ocean Mapping Center for Coastal and Ocean Mapping5-2012Seafloor Characterization for Trawlability Using theSimrad ME70 Multibeam Echosounder in the Gulfof AlaskaJodi L. PirtleUniversity of New Hampshire, DurhamThomas C. WeberUniversity of New Hampshire, Durham, thomas.weber@unh.eduChris RooperNMFSA/AFSCChristopher D. WilsonAlaska Fisheries Science CenterBrian R. CalderUniversity of New Hampshire, Durham, brian.calder@unh.eduFollow this and additional works at: https://scholars.unh.edu/ccomPart of the Computer Sciences Commons, and the Oceanography and Atmospheric Sciences andMeteorology CommonsThis Conference Proceeding is brought to you for free and open access by the Center for Coastal and Ocean Mapping at University of New HampshireScholars' Repository. It has been accepted for inclusion in Center for Coastal and Ocean Mapping by an authorized administrator of University of NewHampshire Scholars' Repository. For more information, please contact nicole.hentz@unh.edu.Recommended CitationPirtle, Jodi L.; Weber, Thomas C.; Rooper, Chris; Wilson, Christopher D.; and Calder, Brian R., "Seafloor Characterization forTrawlability Using the Simrad ME70 Multibeam Echosounder in the Gulf of Alaska" (2012). GeoHab, Marine Geological and BiologicalHabitat Mapping Meeting. 839.https://scholars.unh.edu/ccom/839Seafloor Characterization for Trawlability Using the Simrad ME70 Multibeam Echosounder in the Gulf of Alaska  Jodi L. Pirtle*1, Thomas C. Weber1, Christopher D. Wilson2, Christopher N. Rooper2, Brian R. Calder1  1University of New Hampshire, Center for Coastal and Ocean Mapping, 24 Colovos Road, Durham,  New Hampshire, 03824 USA, jpirtle@ccom.unh.edu. 2Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, 7600 Sand Point Way NE, Seattle, Washington, 98115 USA.  Rockfish (Sebastes spp.) stocks that associate with rugged seafloor types are difficult to assess with bottom-trawl sampling gear. Alternative methods including acoustic remote sensing and video imagery may improve rockfish assessment in untrawlable locations. Acoustic remote sensing can also be applied to quantify regions of trawlable or untrawlable seafloor and thus identify locations where alternative assessment methods may be required. We are using the Simrad ME70 multibeam echosounder (ME70), Alaska Fisheries Science Center (AFSC) trawl survey data, and video imagery to assess seafloor trawlability for locations in the Gulf of Alaska (GOA).   We surveyed areas of the GOA (20-500 m depth) using the ME70 aboard the NOAA Ship Oscar Dyson during summer 2011, from the Islands of Four Mountains, in the Aleutian Islands (169°59'0"W 52°43'11"N) to eastern Kodiak Island (151°5'25"W 57°20'46"N). Multibeam acoustic data was collected continuously along the ship trackline (1-20 nmi trackline spacing) and at fine-scale survey locations with 100% bottom coverage (n = 21). Video data was collected at fine-scale survey sites using a drop camera to groundtruth the  acoustic seafloor characterization and to identify associated fish and invertebrate species (n = 47 camera dives). At locations where historical bottom trawl hauls and 2011 camera drops were conducted, the acoustic-derived seafloor parameters that were most discriminatory in characterizing trawlable and untrawlable seafloor types were identified using a stochastic modeling approach. The extension of this approach to fish habitat characteristics will also be discussed. 

Seafloor Characterization for Trawlability Using the Simrad ME70 Multibeam Echosounder in the Gulf of Alaska

https://scholars.unh.edu/cgi/viewcontent.cgi?article=1839&context=ccom

Seafloor Characterization for Trawlability Using the Simrad ME70 Multibeam Echosounder in the Gulf of Alaska

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