Study on the behavior of suspended solids in the neritic region in an inner bay

Hiroaki Tanaka, Hideo Oshikawa, Akira Tai, Yuichi Hayami

Research output: Contribution to conferencePaperpeer-review

Abstract

In recent years, the behavior of suspended solids (SS) in coastal areas has been investigated. However, because SS consist mostly of fine cohesive particles, their physical and chemical characteristics have not been sufficiently determined. In this study, in order to clarify the properties of SS in the neritic region in an inner bay, the effects of sea surface waves, currents, and turbulence on SS were investigated by conducting field observations in Isahaya Bay in the Ariake Sea, which is a typical enclosed sea and has the largest tidal range in Japan. Turbidity was used for the analysis as a proxy for SS because it is difficult to measure SS continuously. Spectral analysis of flow velocity, water pressure near the sea bottom, and water depth were carried out to reveal fluctuations in turbidity. The results showed that wind waves and related wave breaking were important for increasing turbidity and that the anisotropy of turbulence was strengthened by the wave breaking. Therefore, both wind waves and wave breaking should be considered adequately in the evaluation and prediction of the behavior of SS in inner bays.

Original languageEnglish
Publication statusPublished - 2020
Event22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020 - Sapporo, Virtual, Japan
Duration: Sep 14 2020Sep 17 2020

Conference

Conference22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020
Country/TerritoryJapan
CitySapporo, Virtual
Period9/14/209/17/20

All Science Journal Classification (ASJC) codes

  • Ecology
  • Environmental Engineering

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