IMAGE-BASED FIELD OBSERVATION OF INFRAGRAVITY WAVES ALONG THE SWASH ZONE

Yoshimitsu Tajima

doi:10.9753/icce.v34.currents.28

No. 34 (2014), Swash, Nearshore Currents, and Long Waves

No. 34 (2014)

IMAGE-BASED FIELD OBSERVATION OF INFRAGRAVITY WAVES ALONG THE SWASH ZONE

Swash, Nearshore Currents, and Long Waves

https://doi.org/10.9753/icce.v34.currents.28

Published 2014-10-30

Yoshimitsu Tajima⁺⁻

Yoshimitsu Tajima

Professor

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Keywords

image-based monitoring
swash zone
infragravity wave
edge wave

How to Cite

Tajima, Y. (2014). IMAGE-BASED FIELD OBSERVATION OF INFRAGRAVITY WAVES ALONG THE SWASH ZONE. Coastal Engineering Proceedings, 1(34), currents.28. https://doi.org/10.9753/icce.v34.currents.28

Abstract

This study develops an image-based monitoring techniques for observations of surf zone hydrodynamics especially focusing on evolution and propagations of infragravity waves along the coast. Laboratory experiment was first performed to investigate the relationship between image-captured shoreline fluctuations and recorded actual water surface fluctuations inside the surf zone. Frequency components of infragravity waves were extracted respectively from observed shoreline changes and recorded water surface fluctuations. Both components showed good agreement in terms of their alongshore distributions of phases and amplitudes. The same image-based technique was applied to the field, the Seisho coast when the typhoon 1112 approached the site and extracted infragravity wave components were found to be consistent with offshore wave data and showed characteristics of edge waves.

https://doi.org/10.9753/icce.v34.currents.28

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References

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Ranasinghe, R.S., Y. Fukase, S. Sato and Y. Tajima. 2011. Local concentration of waves due to alongshore variation of nearshore bathymetry, Coastal Engineering Journal, 53, 3, 201-222.

Sato, S. Kosugi, T., Kato, K. and T. Kuchiishi. 1998. Field Investigation of Coastal Damages on Seishoh Coast Caused by Typhoon 9720, Proc. of Coastal Eng., JSCE, vol.45, pp.326-330. (in Japanese)

Seki, K., and Y. Mizuguchi. 2008. Shoaling of long period waves induced by grouping short-waves on sloping bottom. Journal of the Japan Society of Civil Engineers B, JSCE, vol.64, 62-70 (in Japanese)ï¼Ž

Tajima, Y., H. Liu. and S. Sato.ï¼šDynamic changes of waves and currents over the collapsing sandbar of the Tenryu river mouth observed during Typhoon T0704, Proc. of Coastal Dynamics 2009, CD-ROM published by World Scientific.

Tajima, Y. and S. Sato. 2009. Numerical investigations of locally concentrated damages on Seisho coast sue to typhoon T0709, Proc. of 5th Int. Conf. on Asian and Pacific Coasts.

Tajima, Y. and S. Sato. 2010. Local concentration of slowly varying wave and current fields around the abruptly changing bottom slopes along the shore, Proc. of 32nd Int. Conf. on Coast. Eng., doi: http://dx.doi.org/10.9753/icce.v32.waves.21

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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IMAGE-BASED FIELD OBSERVATION OF INFRAGRAVITY WAVES ALONG THE SWASH ZONE

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