Localization of a seafloor towed gamma ray spectrometer
Localization of a seafloor towed gamma ray spectrometer
A ship towed gamma ray spectrometer has been developed to continuously map the distribution of radionuclides on the seafloor following the release from the Fukushima-Daiichi Nuclear Power Plant. The device enables continuous measurement of gamma emitters such as 137Cs and 134Cs to be made over long distances. In order to geo-reference the measurements made, accurate localization of the system is necessary. In this paper, a method to determine the location of the instrument is developed based on simulations using a two phase lumped mass model of the towed system. The effects of environmental parameters such as the frictional coefficient of the seafloor, and underwater currents on the position of the towed system are assessed in order to bound uncertainty in the position estimates. We demonstrate the accuracy of the model by comparing depth measurements of the towed system with acoustic measurements of bathymetry during towed deployment at sea.
7-12
Sasaki, Shun
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Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Yano, Yusuke
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Ura, Tamaki
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September 2013
Sasaki, Shun
f34a380b-54b0-4834-88ab-81d01e329739
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Yano, Yusuke
63d7a6f0-0757-4832-bd6d-7cbc0dede012
Ura, Tamaki
b8fea5ba-e731-40fd-8544-1db1ca9f356b
Sasaki, Shun, Thornton, Blair, Yano, Yusuke and Ura, Tamaki
(2013)
Localization of a seafloor towed gamma ray spectrometer.
Journal of the Japan Society for Marine Surveys and Technology, 25 (2), .
(doi:10.11306/jsmst.25.2_7).
Abstract
A ship towed gamma ray spectrometer has been developed to continuously map the distribution of radionuclides on the seafloor following the release from the Fukushima-Daiichi Nuclear Power Plant. The device enables continuous measurement of gamma emitters such as 137Cs and 134Cs to be made over long distances. In order to geo-reference the measurements made, accurate localization of the system is necessary. In this paper, a method to determine the location of the instrument is developed based on simulations using a two phase lumped mass model of the towed system. The effects of environmental parameters such as the frictional coefficient of the seafloor, and underwater currents on the position of the towed system are assessed in order to bound uncertainty in the position estimates. We demonstrate the accuracy of the model by comparing depth measurements of the towed system with acoustic measurements of bathymetry during towed deployment at sea.
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Published date: September 2013
Organisations:
Fluid Structure Interactions Group
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Local EPrints ID: 400028
URI: http://eprints.soton.ac.uk/id/eprint/400028
PURE UUID: 50b2d9fb-bb15-442a-a6a2-73cd91e4320e
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Date deposited: 13 Sep 2016 15:32
Last modified: 15 Mar 2024 02:08
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Author:
Shun Sasaki
Author:
Yusuke Yano
Author:
Tamaki Ura
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