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Generation of 137Cs surface distribution maps using dense measurement transects of a towed gamma-ray spectrometer

Generation of 137Cs surface distribution maps using dense measurement transects of a towed gamma-ray spectrometer
Generation of 137Cs surface distribution maps using dense measurement transects of a towed gamma-ray spectrometer

In this paper, we describe a method to generate surface distribution maps of seafloor 137Cs levels. The method interpolates the measurements of a towed gamma-ray spectrometer, which are made along intersecting line transects, by modeling the spatial variations between each observation. Since it is known that sediment type has an influence on the distribution of 137Cs, the proposed method aims to improve the spatial auto correlation of the models by segregating the surveyed area into continuous regions in which the sediment types are judged similar. This is achieved based on the back-scatter intensity of side scan sonar images taken in the surveyed region. The method is applied to data obtained at the Abukuma river mouth located approximately 80km north from F1NPP on October 2013. The accuracy of the proposed method was evaluated by correlating the levels of 137Cs in the generated maps with samples that were obtained in the same area. The results demonstrate that the proposed method of interpolation improves the correlation compared to conventional methods that do not account for sediment type.

137Cs, Kriging, Seafloor sediment, Spatial interpolation
IEEE
Murata, Kosuke
e4ffb0ad-45df-4040-ad1d-3d2d5fbc31e0
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Nagano, Kazunori
49129778-f2c4-4e6c-ac1d-8ac67dce16a4
Ohnishi, Seiki
035c497a-ec02-4ce9-9879-a39a916b5d9a
Murata, Kosuke
e4ffb0ad-45df-4040-ad1d-3d2d5fbc31e0
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Nagano, Kazunori
49129778-f2c4-4e6c-ac1d-8ac67dce16a4
Ohnishi, Seiki
035c497a-ec02-4ce9-9879-a39a916b5d9a

Murata, Kosuke, Thornton, Blair, Nagano, Kazunori and Ohnishi, Seiki (2016) Generation of 137Cs surface distribution maps using dense measurement transects of a towed gamma-ray spectrometer. In IEEE Washington OCEANS'15 MTS. IEEE.. (doi:10.23919/OCEANS.2015.7404517).

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper, we describe a method to generate surface distribution maps of seafloor 137Cs levels. The method interpolates the measurements of a towed gamma-ray spectrometer, which are made along intersecting line transects, by modeling the spatial variations between each observation. Since it is known that sediment type has an influence on the distribution of 137Cs, the proposed method aims to improve the spatial auto correlation of the models by segregating the surveyed area into continuous regions in which the sediment types are judged similar. This is achieved based on the back-scatter intensity of side scan sonar images taken in the surveyed region. The method is applied to data obtained at the Abukuma river mouth located approximately 80km north from F1NPP on October 2013. The accuracy of the proposed method was evaluated by correlating the levels of 137Cs in the generated maps with samples that were obtained in the same area. The results demonstrate that the proposed method of interpolation improves the correlation compared to conventional methods that do not account for sediment type.

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Published date: 8 February 2016
Venue - Dates: MTS/IEEE Washington, OCEANS 2015, , Washington, United States, 2015-10-18 - 2015-10-21
Keywords: 137Cs, Kriging, Seafloor sediment, Spatial interpolation

Identifiers

Local EPrints ID: 414083
URI: http://eprints.soton.ac.uk/id/eprint/414083
PURE UUID: 77b2e437-5a05-4a7a-b06a-1c62b196ff30

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Date deposited: 14 Sep 2017 16:31
Last modified: 03 Dec 2020 17:36

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Contributors

Author: Kosuke Murata
Author: Blair Thornton
Author: Kazunori Nagano
Author: Seiki Ohnishi

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