0 1000 2000 x[m] 0 50 y[m] Figure 2 Variation of intertidal morphology Wavy features (wave length ~ 350 m) in the foreshore are migrating in +x direction with a speed of 16 m/day. Bottom elevations (D.L.) [m] are displayed in gray scale.
IntroductionLongshore migrations of coastal features, like shoreline, foreshore morphology, rip channels, bar system etc. are observed at coasts in the world, which are fascinating for scientists and annoying for engineers. Reported annual mean migration speeds are in order of 1 ~ 2 m/day, but no accepted explanation is given for the migration mechanism. There are several reports in Japan in which longshore migrations of eroded areas are described. If a better understanding on the migration mechanism and speeds is available, coastal prevention works may be planned more adequately.
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