Experimental study on bottom shear stress under sawtooth waves

Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

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

Abstract

The bottom shear stress estimation under sawtooth wave is the crucial step, which is required as an input to most of sediment transport model under rapid acceleration and the contribution of pre-suspended sediment to the onshore sediment transport in swash zone. Suntoyo et al. (2002) had shown that the bottom shear stress variation under sawtooth wave was dependent on high acceleration and deceleration. However, investigation of a more reliable calculation method to estimate the time-variation bottom shear stress under sawtooth wave over rough bed has not deeply done yet. In the present study, turbulent bottom boundary layer flow under sawtooth wave is investigated with the experiments in oscillating wind tunnel over rough bed by laser Doppler velocimeter (LDV) to measure velocity distribution. Bottom shear stress will be estimated by fitting the logarithmic velocity profile to the measured velocity. Furthermore, the experimental results will be examined with the bottom shear stress calculation method based on both the consideration of the friction coefficient for sinusoidal wave motion and that of the acceleration effect for sawtooth wave.

Original languageEnglish
Title of host publicationAsian and Pacific Coasts, 2003 - Proceedings of the 2nd International Conference
EditorsYoshimi Goda, Kazuo Nadaolta, Wataru Kiolta
Publisher[publishername] World Scientific
ISBN (Print)9789812703040
DOIs
Publication statusPublished - 2004 Jan 1
Event2nd International Conference on Asian and Pacific Coasts, APAC (WITH CD-ROM) 2003 - Chiba, Japan
Duration: 2004 Feb 292004 Mar 4

Publication series

NameAsian and Pacific Coasts, 2003 - Proceedings of the 2nd International Conference

Conference

Conference2nd International Conference on Asian and Pacific Coasts, APAC (WITH CD-ROM) 2003
CountryJapan
CityChiba
Period04/2/2904/3/4

Keywords

  • Bottom shear stress
  • Rough bed
  • Sawtooth wave
  • Sediment transport
  • Turbulent bottom boundary layer

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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