American Society of Civil Engineers


Longshore Migration of Coastal Features Observed with X-Band Radar


by Satoshi Takewaka, (Department of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan E-mail: takewaka@kz.tsukuba.ac.jp), El Sayed Galal, (Graduate, School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan. E-mail: sayed@surface.kz.tsukuba.ac.jp), Ryosuke Matsumoto, (West Japan Railway Company. Former graduate student), and Shinya Sasakura, (Graduate, School of Systems and Information Engineering, University of Tsukuba Tsukuba, Ibaraki, 305-8573, Japan E-mail: sasakura@surface.kz.tsukuba.ac.jp)

pp. 1900-1909, (doi:  http://dx.doi.org/10.1061/40926(239)149)

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Document type: Conference Proceeding Paper
Part of: Coastal Sediments ’07
Abstract: Intertidal morphology was monitored continuously with an X-band radar at research pier HORS located in Hasaki, Japan facing Pacific Ocean. The horizontal extent of a radar image is approximately 5.6 km and hourly averaged radar images were processed to observe longshore distributions of shoreline and bar positions. Longshore mean shoreline and bar positions and their variation showed a seasonal change, which follows so-called beach-cycle. Wavy features with wavelength of several hundred meters were observed in shoreline locations at low energy periods, which migrated to the down-wave. Migration speeds show high correlation with the longshore current velocities measured at the pier. Wavy appearances were also observed in bar locations and their migrations are also correlated with the longshore velocities.


ASCE Subject Headings:
Coastal environment
Radar
Morphology
Japan