Internal Erosion – Applying Erosion Mechanics From ICOLD Bulletin 164 In Internal Erosion Failure Mode Analyses: Agenda

INTERNAL EROSION AS SEEN BY ICOLD BULLETIN 164

  • Introduction to ICOLD
  • Need for guidance – failures, fatalities, speed of failure
  • Bulletin responds to needs – new knowledge
  • Mechanics of internal erosion – failures when water level high during floods
  • Four internal erosion failure modes, estimating water levels causing internal erosion failure, case histories
  • Contact erosion
  • Concentrated leak erosion
    • Crack locations
    • Filter erosion boundaries approach to filtering capacity of dam fill
    • Vulnerability at spillways and culverts
  • Suffusion
  • Backward erosion (and piping)
  • Summary of four modes of erosion mechanics
  • Addressing internal erosion potential in dams – before critical flood occurs

INTERNAL EROSION FAILURE MODE ANALYSES & RISK ASSESSMENT

  • Examples of potential failure routes
  • Events where subjective assessments necessary
  • How using ICOLD Bulletin 164 will improve PFMA
  • Probability estimation for risk analysis
  • Probability estimated from critical flood level from ICOLD 164 internal erosion analyses
  • Some examples of internal erosion risk assessment

SUMMARY & RECOMMENDATIONS

Special thanks to our sustaining members