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Observation of Whole Flushing Process of a River Sand Bar by a Flood Using X-Band Radar

Division of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
Academic Editor: Gerben Ruessink
J. Mar. Sci. Eng. 2016, 4(2), 32;
Received: 25 December 2015 / Revised: 4 April 2016 / Accepted: 18 April 2016 / Published: 4 May 2016
(This article belongs to the Special Issue Coastal Morphodynamics)
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Morphological changes during a flood event in July 2010 were observed with X-band marine radar at the mouth of Tenryu River, Shizuoka, Japan. Radar images were collected hourly for more than 72 h from the beginning of the flood and processed into time-averaged images. Changes in the morphology of the area were interpreted from the time-averaged images, revealing that the isolated river dune was washed away by the flood, the width of the river mouth increased gradually, and the river mouth terrace expanded radially. Furthermore, image analysis of the radar images was applied to estimate the migration speed of the brightness pattern, which is assumed to be a proxy of bottom undulation of the river bed. The migration was observed to be faster when the water level gradient between the river channel and sea increased. View Full-Text
Keywords: flushing of river sand bar; remote sensing; X-band radar flushing of river sand bar; remote sensing; X-band radar

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Takewaka, S. Observation of Whole Flushing Process of a River Sand Bar by a Flood Using X-Band Radar. J. Mar. Sci. Eng. 2016, 4, 32.

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