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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Effects of embankment breach position on characteristics of failure
Effects of embankment breach position on characteristics of failure
Many studies of embankment failure from overtopping flow have been conducted in various aspects. Most of them focused
on the mechanism of breach, depth and width of erosion, and breach hydrograph. The studied results as obtained either
from physical modelling, mathematical modelling or couples modeling techniques were applicable only to the breach
position which could be eroded freely on both sides but could not be applied properly to simulate the embankment failure
where the breach position occurred near solid wall of structures which was unerodible. The aim of this research was to
study the effect of breach position on breach parameter at such location from a physical hydraulic model under various
conditions of overtopping flow and embankment properties. Three embankment slopes, 1:1, 1:1.5, and 1:2, were
employed in the study and, for each embankment slope, the breach was initiated at three different positions from the solid
wall. The X1 position is the nearest to the wall, the X3 position is approximately at the middle of the embankment length
and the X2 position is about the middle between X1 and X3.
The results showed that, under the same embankment slope and overtopping discharge, mechanism of embankment
breach of every initial breach position started with surface erosion and then developed to headcut erosion by jet scour at
the toe of embankment. Eroded soil volume of the three cases, X1, X2 and X3, were almost of the same quantity.
Embankment breach width of X3 case was the widest while that of X1 case was the narrowest. On the contrary, breach
depth of X1case was the deepest while that of X3 is the shallowest.In conclusion, It was found that breach position did not
have any evident effect on the volume of eroded soil but it did have strong effects on the breach depth and width.It was
also found that as the initial breach position is closer to the solid wall or non-erodible materials, the depth of breach is
deeper and might be a major threat leading to foundation failure of the structure.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 14/08/2015
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