Abstract
Long-term shoreline changes on the marginal coast of the Banzu tidal flat in Tokyo Bay were investigated using
 aerial photographs. In the area immediately north of the Obitsu River mouth, the beach was eroded owing to the
 decrease in sand supply from the river, resulting in the exposure of a layer composed of cohesive material in the
 previous tidal flat, and sand was transported northward to form a sand spit at the mouth of the north tributary. In
 2011, the giant tsunami generated by the Great East Japan Earthquake propagated deep into Tokyo Bay, and sand
 bars were pushed landward by 7 m parallel to the shoreline owing to the tsunami overflow.
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