Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
ISSN-L : 1883-8944
Paper
A STADY ON SEDIMENT MOVEMENT DURING A STORM USING FLUORESCENT SAND
Takayuki SUZUKIYu INAMIYoshiyuki NAKAMURAMasayuki BANNO
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JOURNAL FREE ACCESS

2015 Volume 71 Issue 2 Pages I_679-I_684

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Abstract

 The field experiments were conducted at Hasaki Coast, Japan in order to investigate the sediment crossshore and vertical movements in the area of the swash zone to the offshore end of the surf zone. In the experiments, the fluorescent sand was installed on the coast for five locations from the swash zone to the offshore. After the storm pass through the site, eight vertical sand cores were collected. During the experiments, wave data, and ground elevation data were also collected. The cores are subdivided after scanning by an X-ray scanner, the vertical distributions of sediment diameter and the number of fluorescent sand are investigated. From the ground elevation survey, an offshore bar was moved offshore about 30 m due to the storm. The fluorescent sand that installed near the bar were not collected in the surf zone or swash zone. This fact indicates that the sand around the bar area was advected toward alongshore or offshore. The fluorescent sand that installed in the swash zone and surf zone were drifted toward the swash zone and the trough area. Therefore, it can be considered that the sand movements are separated onshore side and offshore side of the bar. Moreover, it is suggested that the sediment transport in the trough area during a storm is affected by the longshore current.

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© 2015 by Japan Society of Civil Engineers
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