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Instruments and methods for acoustic and visual survey of manganese crusts

Instruments and methods for acoustic and visual survey of manganese crusts
Instruments and methods for acoustic and visual survey of manganese crusts
This paper describes acoustic and visual instruments developed to perform high-resolution surveys of the volumetric distribution of manganese crusts from an underwater vehicle. The instruments consist of an acoustic device, developed to perform in situ measurements of manganese crust thickness at depths of up to 3000 m, and a vision-based mapping system that generates 3-D color reconstructions of the seafloor. Methods to process the information obtained by these sensors to automatically identify areas of exposed crust using the 3-D reconstructions, and subsequently determine the thickness of the crusts based on the acoustic measurements, are described. Sea trials were performed at #5 Takuyo seamount with the systems mounted onboard the remotely operated vehicle Hyper-Dolphin during the NT10-11 cruise of the R/V Natsushima. The results are that the first time in situ measurements of manganese crust thickness have been performed, and it is demonstrated that, for the types of substrate dominant in the surveyed area, continuous acoustic measurement of manganese crust thickness is possible. The work described in this paper indicates that the proposed instruments and data processing algorithms can form useful tools to enable more efficient survey of manganese crusts.
0364-9059
186-203
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Asada, Akira
76e2e5fe-718d-4cdc-a708-4bf1112d8b0a
Bodenmann, Adrian
070a668f-cc2f-402a-844e-cdf207b24f50
Sangekar, M.
696f8f96-233c-4f60-839f-cd327a7c62c5
Ura, Tamaki
b8fea5ba-e731-40fd-8544-1db1ca9f356b
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Asada, Akira
76e2e5fe-718d-4cdc-a708-4bf1112d8b0a
Bodenmann, Adrian
070a668f-cc2f-402a-844e-cdf207b24f50
Sangekar, M.
696f8f96-233c-4f60-839f-cd327a7c62c5
Ura, Tamaki
b8fea5ba-e731-40fd-8544-1db1ca9f356b

Thornton, Blair, Asada, Akira, Bodenmann, Adrian, Sangekar, M. and Ura, Tamaki (2013) Instruments and methods for acoustic and visual survey of manganese crusts. IEEE Journal of Oceanic Engineering, 38 (1), 186-203, [38]. (doi:10.1109/JOE.2012.2218892).

Record type: Article

Abstract

This paper describes acoustic and visual instruments developed to perform high-resolution surveys of the volumetric distribution of manganese crusts from an underwater vehicle. The instruments consist of an acoustic device, developed to perform in situ measurements of manganese crust thickness at depths of up to 3000 m, and a vision-based mapping system that generates 3-D color reconstructions of the seafloor. Methods to process the information obtained by these sensors to automatically identify areas of exposed crust using the 3-D reconstructions, and subsequently determine the thickness of the crusts based on the acoustic measurements, are described. Sea trials were performed at #5 Takuyo seamount with the systems mounted onboard the remotely operated vehicle Hyper-Dolphin during the NT10-11 cruise of the R/V Natsushima. The results are that the first time in situ measurements of manganese crust thickness have been performed, and it is demonstrated that, for the types of substrate dominant in the surveyed area, continuous acoustic measurement of manganese crust thickness is possible. The work described in this paper indicates that the proposed instruments and data processing algorithms can form useful tools to enable more efficient survey of manganese crusts.

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More information

Accepted/In Press date: 8 September 2012
e-pub ahead of print date: 19 October 2012
Published date: January 2013
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400019
URI: http://eprints.soton.ac.uk/id/eprint/400019
ISSN: 0364-9059
PURE UUID: e0fa94ec-8fb1-4790-8e7f-59f665e58337

Catalogue record

Date deposited: 12 Sep 2016 15:45
Last modified: 15 Jul 2019 20:08

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