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Title: Analysis of Breach Characteristics and Equilibrium Scour Pattern for Overtopping Induced River Dyke Breach
Authors: BHATTARAI, Pawan Kumar
NAKAGAWA, Hajime  kyouindb  KAKEN_id
KAWAIKE, Kenji  kyouindb  KAKEN_id
Keywords: River dyke
Seepage flow
Lateral widening
Breach discharge
Issue Date: Jun-2015
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B
Volume: 58
Issue: B
Start page: 386
End page: 401
Abstract: River dykes is an important and effective measure to prevent floods.However, dynamic lateral widening of the breach process, resulting flow and sediment hydrographs and the scour beneath the dyke are poorly understood in current studies. Therefore, this study conducted laboratory experiments and numerical simulations of river dyke breach due to overtopping flow with different sediment sizes. The influence of sediment size of dyke materials on the breach process were discussed based on the results of the laboratory experiments, and a numerical model was developed to simulate the breach process of dykes by flow overtopping.To simulate the dyke breach phenomenon, the numerical model consisted of two-dimensional shallow-water flow, seepage flow, sediment transport and collapse model. The reproducibility of the developed model was tested using experimental data on dyke breach phenomena. The numerical results are well agreed with the results.
Appears in Collections:Vol.58 B

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