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Determination of initial conditions for dam erosion due to overtopping and possible integration into a probabilistic design concept. Dr.-Ing. K. Broich. University of the Federal Armed Forces Munich. Initial conditions Case study Monte Carlo simulation.

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slide1

Determination of initial conditions for dam erosion due to overtopping and possible integration into a probabilistic design concept

Dr.-Ing. K. Broich

University of the Federal Armed Forces Munich

slide2

Initial conditions

  • Case study
  • Monte Carlo simulation

University of the Federal Armed Forces Munich

slide3

dH/dt

dz/dt

Q

Initial period

depletion

t

University of the Federal Armed Forces Munich

slide4

Flood wave

  • Initial breach
  • Initial water depth
  • Outlet
  • Overtopping
  • Dam coverage

University of the Federal Armed Forces Munich

slide6

Proposal :

Safety factor

for Overtoping failure of earthen dams

=

Scaling factor on design flood wave

needed to start erosion

University of the Federal Armed Forces Munich

slide7

Initial conditions

  • Case study
  • Monte Carlo simulation

University of the Federal Armed Forces Munich

slide8

Test case :

1 . Calculation with scaled design flood wave HQ1000

and initial water depth at flood water level

2 . Calculation with unscaled PMF flood wave

and initial water depth at dam crest

University of the Federal Armed Forces Munich

slide9

H

V

University of the Federal Armed Forces Munich

slide12

Initial conditions

  • Case study
  • Monte Carlo simulation

University of the Federal Armed Forces Munich

slide14

Load variables for overtopping

  • Failure mode
  • Flood wave *)
  • Initial water depth

*) bivariate variable -> volume

University of the Federal Armed Forces Munich

slide15

(Hable,2001)

University of the Federal Armed Forces Munich

slide16

The probabilistic method using a Monte Carlo simulation

(Hable, 2001) can be extended to calculate the

probability of an overtopping failure.

The failure condition has to be substituted by the

mentioned „CIRIA-condition“.

University of the Federal Armed Forces Munich

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