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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 7- EXTREME EVENTS, NATURAL VARIABILITY AND CLIMATE CHANGE : 2D MATHEMATICAL MODELING OF HEADCUT EROSION DURING BREACHING OF HOMOGENEOUS EMBANKMENTS
2D MATHEMATICAL MODELING OF HEADCUT EROSION DURING BREACHING OF HOMOGENEOUS EMBANKMENTS
Author : YONGHUI ZHU , XIAOLONG GUO AND YAJUN XIE
Headcut erosion is considered as the main erosion mechanism of embankment breaching due to overflowing. However, predicting headcut erosion is an intricate problem and there is so far not a widely accepted predictive model. Based on the mechanism of headcut erosion as observed in various tests in the laboratory and in the field, the 2D mathematical model of Zhu (2006) for the headcut erosion during breaching of homogeneous embankments is improved. The model covers the shear erosion along the top of the headcut, the jet scour of the foundation and headcut undermining, and the slope mass failure. The model is capable of simulate the process and average rate of headcut erosion, with either erodible or non-erodible foundation. Laboratory experiments are conducted in a flume at the Changjiang River Scientific Research Institute in China to improve the understanding of the physics of headcut erosion. Then the mathematical model has been calibrated against the data of seven flume tests, with good agreement between the model predictions and the experimental data. Based on the model calibration results, the relationship established in Zhu (2006) between the soil erodibility coefficient (K ) in the erosion rate formula and the embankment soil properties is improved as well. d With this expression, validation of the model against the data of four other tests yields good agreement between the model predictions and the measurements.
File Size : 635,751 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 7- EXTREME EVENTS, NATURAL VARIABILITY AND CLIMATE CHANGE
Date Published : 20/04/2016
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