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Sediment Monitoring in Sakiyama and Amitori Bays

  • Takumi OkabeEmail author
  • Tomokazu Murakami
  • Hiroyoshi Kohno
  • Akira Mizutani
  • Shinya Shimokawa
Chapter
Part of the Springer Oceanography book series (SPRINGEROCEAN)

Abstract

This chapter focuses on a technique for directly measuring suspended sediment or directly collecting coastal sediment for analysis. Simple and low-cost techniques employing sediment traps using a polyvinyl chloride pipe to capture suspended sediment and a handheld analyzer for X-ray fluorescent analysis and a digital scanner for image analysis were employed for sediment measurement and analysis. In laboratory experiments, the sediment catch performance of a cylindrical sediment trap was evaluated according to differences in the intake and outlet sizes. The characteristics of the measurement principle of the X-ray fluorescence analysis were described. Furthermore, a technique for digital image analysis that can estimate sediment diameter was constructed. In addition, color measurements using the CIE L* a* b* color space system ascertained sediment color characteristics. Next, these measurement and analysis techniques were applied to sediment monitoring in the Sakiyama and Amitori bays. Fine sediment was captured in the sediment traps. The element content of the coastal sediment from multiple points within the bays and their spatial distributions obtained through X-ray fluorescence analysis were ascertained. The color, diameter, and chemical composition of the sediments were classified using clustering analysis, and the distribution of the cluster within the bays matched the topographical features.

Keywords

Sediment transport Sediment characteristics Cylindrical sediment trap X-ray fluorescence analysis Image analysis 

Notes

Acknowledgements

We would like to thank Mayumi Suzuki and Seishichi Miyauchi, graduates of Tokai University’s School of Marine Science and Technology; and Takumi Shibayama, a graduate of University of Tsukuba, Graduate School of Life and Environmental Sciences, for helping to collect survey data. We also received advice from Professor Shigeru Kato of Toyohashi University of Technology concerning X-ray fluorescence and image analyses. For analytical work, we received the cooperation of Yusuke Aoki and Kazuki Furukawa, both graduates of Toyohashi University of Technology.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Takumi Okabe
    • 1
    Email author
  • Tomokazu Murakami
    • 2
  • Hiroyoshi Kohno
    • 3
  • Akira Mizutani
    • 3
  • Shinya Shimokawa
    • 2
  1. 1.Department of Architecture and Civil EngineeringToyohashi University of TechnologyToyohashiJapan
  2. 2.Storm, Flood and Landslide Research Division, National Research Institute for Earth Science and Disaster ResilienceTsukubaJapan
  3. 3.Okinawa Regional Research CenterTokai UniversityYaeyamaJapan

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