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The mechanism of three-dimensional levee breach by overflow (i.e., lateral overflow with consideration of river flow riverside land) has not been clarified in past studies. Elucidation of this mechanism is very important for disaster prevention as well as for the future progress of studies on levee breach by overflow. We conducted experiments of levee breach in three-dimensions by overflow using the Chiyoda Experimental Channel. The results of the experiment are as follows: Until the beginning of levee breach, phenomena near overflow area was similar to one by front overflow. It means that we can apply knowledge from anamnestic levee breach experiment involving front overflow to until the beginning of levee breach. After the beginning of levee breach, it related to unit width discharge and levee breach speed.

EXPERIMENT FOR THE DESTRUCTIVE MECHANISM OF THE OVERFLOW LEVEE AND FLOODING AREA AT THE CHIYODA EXPERIMENTAL CHANNEL