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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : 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(1), XIAOLONG GUO(2) AND YAJUN XIE(3)
ABSTRACT
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 (Kd) in the erosion rate formula and the embankment soil properties is improved as well.
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 : 601,194 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 19/08/2015
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