Dam and Tailings Dam Breach

Prescribed Dam Breach

Tailings Dam Modeling

FLO-2D is a versatile computer software for flood routing and hydraulic modeling. Beyond its conventional applications, FLO-2D also serves as a powerful tool for tailings dam breach modeling, offering a means to simulate the failure and subsequent flooding behavior of tailings dams in the event of a breach.

By harnessing FLO-2D for tailings dam breach modeling, engineers and researchers can comprehensively evaluate the potential repercussions of dam failures. This includes assessing the downstream flood extent, the velocity and depth of released tailings material, and identifying vulnerable areas at risk. By inputting precise details about the tailings dam’s geometry, geotechnical characteristics, and hydraulic conditions, FLO-2D can simulate the breach and ensuing flooding during a simulated failure event.  FLO-2D computes flow rates, velocities, and inundation areas resulting from a dam failure, thus providing invaluable insights for emergency response planning, risk assessment, and the development of potential mitigation strategies.

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Prescribed Dam Breach

Prescribed breach ….

  • Simulate simple dam breach with vertical and horizontal fail rate.
  • Works with water or tailings reservoir elevations.
  • Regular flow routing and two phase flood routing.
  • Set up a project quickly using QGIS and the FLO-2D plugin.
  • Quickly review the downstream area of inundation, runout and floodwave conditions.

Dam Erosion Breach Freade Method

Dam breach overview here

  • Time dependent and non-linear phenomena – surging.
  • Varies with non-homogenous embankment materials (core and shell).
  • Interaction of complex physical processes: hydrodynamics, geotechnical processes and sediment transport (hyperconcentrated sediment flows).

Two Phase Flow for Tailings Dam Breach

This 2-phase flow modeling component simulates a tailings dam breach with reservoir water and then routes the hyper-concentrated sediment flow downstream.

  • Simulate tailings dam breach with reservoir water storage.
  • Predict downstream fluid and mudflow inundation.
  • Compute mudflow – fluid exchange with scour and deposition.
  • Simulate downstream tributary inflow and mudflow into lakes and reservoirs.
  • Predict sediment routing by size fraction.
  • Predict mudflow cessation and re-mobilization.
  • Combine with the FLO-2D Tailings Dam Tool to estimate verify volume releases.

Tailings Dam Breach Volume Tool

This training package will demonstrate how to use the Tailings Dam Breach Volume tool that predicts a tailings dam breach hydrograph based on historical breaches.

  • Evaluates the probability of tailings dam failure occurrence for a hydrologic, static, or seismic failure.
  • Predicts the tailings dam breach release volume hydrograph and sediment concentration.
  • Automatically generates the INFLOW.DAT file for downstream routing in FLO-2D.
  • Compare estimated volume with the simulated breach volume in the SUMMARY.OUT file.

Routing Tailings Dam Breach Mudflows Downstream

This FLO-2D training package provides an overview of modeling hyper-concentrated sediment flows (mudflows) resulting from tailings dam failures.

  • Overview mudflow routing
  • Discussion of mudflow parameters and output
  • Predicting tailings mobilization and mudflow progression downstream of breach
  • Mudflow simulation with 2-phase flow and fluid layer sediment exchange

Tailings Dam Breach – Sediment Transport, Scour and Deposition

This training package focuses on FLO-2D 2 phase flow component to that simulates fluid layer sediment transport.

  • Overview sediment transport concepts, regimes and definitions
  • FLO-2D convention sediment transport component using total load capacity equations
  • Sediment data input
  • Scour and deposition, scour limitations, sediment routing by size fractions
  • Two phase flow – fluid and mudflow layer sediment exchange and bed scour/deposition
  • FLO-2D results and how to use them

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