Geochemical and statistical analysis of heavy metals and elements in tsunami deposits at coastal areas of northeastern Japan

Takeshi Komai, Tatsu Kuwatani, Yoshishige Kawabe, Junko Hara, Noriyoshi Tsuchiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Huge amount of tsunami deposits remain after the large earthquake and tsunami occurred on March 11, 2011. This event may bring a possibility of environmental pollutions, particularly in the environment of soil and sediments around coastal areas of eastern Japan. Therefore a geochemical survey and investigation for soil contamination risk was carried out, to make clear the risk level caused by tsunami event and its deposits. Samples of tsunami deposits were analyzed by means of chemical and physical methods to accumulate the database for evaluating the environmental risk. Various kinds of tsunami deposits were observed at the coastal areas, some of them are sandy sediments and others are muddy with much clay components. The result of chemical analysis showed that some portions of deposits contain a little higher content of arsenic and lead, however, almost are similar component compared with normal subsurface soils. In the analysis of physical properties of deposits, a series of database was developed for particle distribution, soil and clay components, and content of organic matters. An approach of statistical analysis of elements in tsunami deposits was conducted by using an original technic of sparse modeling, in which the discrimination between tsunami deposits and normal marine stratums has been investigated.

Original languageEnglish
Title of host publicationProceedings of the 24th International Ocean and Polar Engineering Conference, ISOPE Busan
PublisherInternational Society of Offshore and Polar Engineers
Pages85-89
Number of pages5
ISBN (Print)9781880653913
Publication statusPublished - 2014 Jan 1
Event24th International Ocean and Polar Engineering Conference, ISOPE 2014 Busan - Busan, Korea, Republic of
Duration: 2014 Jun 152014 Jun 20

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other24th International Ocean and Polar Engineering Conference, ISOPE 2014 Busan
CountryKorea, Republic of
CityBusan
Period14/6/1514/6/20

Keywords

  • Heavy metals
  • Risk assessment
  • Sparse modeling
  • Statistical analysis
  • Tsunami deposits

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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  • Cite this

    Komai, T., Kuwatani, T., Kawabe, Y., Hara, J., & Tsuchiya, N. (2014). Geochemical and statistical analysis of heavy metals and elements in tsunami deposits at coastal areas of northeastern Japan. In Proceedings of the 24th International Ocean and Polar Engineering Conference, ISOPE Busan (pp. 85-89). (Proceedings of the International Offshore and Polar Engineering Conference). International Society of Offshore and Polar Engineers.