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In recent years, disasters caused by typhoons, localized downpours, and other phenomena have occurred frequently, and concern over the risk of large-scale water damage caused by river flooding has risen. Although damage resulting from levee breach is particularly serious, there is a lack of technical data on the mechanism behind that phenomenon. Accordingly, this mechanism needs to be clarified to reduce the risk of flood damage. We examined the relationship between the quantification of the levee breach volume and hydraulic parameters. In the widening stage of levee breach, the breach phenomenon can be described in terms of the traction of soil masses from the levee body as a result of flood flow. It was also found that the relationship between the extent of dimensionless levee collapse and dimensionless traction force around the mouth of the breach can be expressed in a form similar to that of the bed load formula.

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Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

Tobita

Kakinuma

Yokoyama

et al. 2014

Journal of JSCE

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Experiment for the Destructive Mechanism of the Overflow Levee and Flooding Area at the Chiyoda Experimental Channel

Shimada¹,

Yokoyama²,

Hirai³

et al. 2011

J. JSCE

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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.

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Simulation Real Scale Experiment on Levee Breach Using 2d Shallow Flow Model

Zenno¹,

Iwasaki²,

Shimizu³

et al. 2011

J. JSCE

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北海道大学大学院工学研究院(〒060-8628 札幌市北区北13条西8丁目) 2 学生員修(工) 北海道大学大学院工学研究院(〒060-8628 札幌市北区北13条西8丁目) 3 正会員工博北海道大学大学院工学研究院教授(〒060-8628 札幌市北区北13条西8丁目) 4 正会員工博北海道大学大学院工学研究院准教授(〒060-8628 札幌市北区北13条西8丁目) Flood in rivers is a common disaster all over the world. If a levee breach happens, it sometimes causes a fatal disaster. In addition, many buildings, urban facilities, lifelines, etc. are seriously damaged. Detailed mechanism of a levee breach has not been clarified yet. Therefore, it is important to predict the collapsing process of riverbank and behavior of overtop flow for reducing damage. We applied a two-dimensional shallow flow computational model to levee breach phenomena caused by overflow and the performance of the model was elucidated. A calibration of the numerical model is made through the comparison with field experimental data. Recently, a real-scale experiment on a levee breach was carried out at the Chiyoda Experimental Channel in Hokkaido, Japan. We performed the computation under the same conditions in the experiment. The computational results showed the excellent performance for simulating levee breach phenomena.

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Cited by 3 publications

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Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

Quantification of Levee Breach Volume Based on Levee Breach at the Chiyoda Experimental Flume

Experiment for the Destructive Mechanism of the Overflow Levee and Flooding Area at the Chiyoda Experimental Channel

Simulation Real Scale Experiment on Levee Breach Using 2d Shallow Flow Model

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