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IMPACT Project Breach Modeling Tests

IMPACT Project Breach Modeling Tests. Dam Failures Increasing (?) Worldwide. Aug. 21, 2002 Dam Bursts in Central India, 25 Feared Dead

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IMPACT Project Breach Modeling Tests

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  1. IMPACT Project Breach Modeling Tests

  2. Dam Failures Increasing (?) Worldwide

  3. Aug. 21, 2002 Dam Bursts in Central India, 25 Feared Dead BHOPAL, India (Reuters) -- A dam burst under the pressure of heavy monsoon rains in central India on Wednesday, washing away at least 25 people, officials said. Some Recent Headlines Tuesday, 4 June, 2002 Syrian Dam Collapses DAMASCUS, Syria (BBC) -- Villages have been flooded in northern Syria after a dam collapsed. The state-run Syrian Arab News Agency (Sana) reported widespread damage and heavy casualties around the Zeyzoun Dam, near the town of Hama, about 350 kilometres (220 miles) north of Damascus. August 16, 2002 Dams Burst in Mexico, Killing 11 By THE ASSOCIATED PRESSVILLA DE REYES, Mexico (AP) -- Heavy rains burst two dams and sent a wave of flood waters roaring over villages in central Mexico, where authorities said at least 11 people were killed -- including a 6-month-old baby. March 23, 1999 Chinese Dams DamnedBy Duncan Hewitt (BBC) in Beijing Thousands of Chinese dams have been described as "time bombs" by Chinese officials. They said more than one-third of the country's estimated 85,000 dams are defective and need urgent repairs.

  4. A priori simulation of failure of two large-scale experimental earthen embankments from erosion by overtopping flows Two-dimensional depth-averaged flow and sediment transport model that models breach development and the resulting flood wave. Breach Model Tests

  5. Governing Equations

  6. Sediment Transport (General)

  7. Engelund-Hansen Laursen Bagnold (1956) Yang (sand and gravel) Meyer-Peter and Mueller Others… Total Load Equations

  8. Conceptual model of Bennett and Nordin (1977) Three layers Active layer always Deposition layer sometimes Armoring can occur Bed Composition Accounting

  9. Embankment Erosion

  10. Soil Texture Classes

  11. Finite Volume Formulation

  12. Field Test #1 Mesh

  13. Field Test #1 Mesh

  14. Field Test #1 Embankment • Homogeneous (maximum cohesive) soils: • Clay = 25% • Silt = 60% • Sand = 15% • Embankment: • Height = 6.0 m • Length = 36 m • Slope = 2:1 (horz:vert) upstream and down • Crest: • Elevation = 370.81 m • Width = 2.0 m

  15. Field Test #1 at 1:00 h

  16. Field Test #1 at 2:00 h

  17. Field Test #1 at 2:30 h

  18. Field Test #1 at 4:00 h

  19. Field Test #1 Crest Profile

  20. Field Test #1Embankment Transect

  21. Field Test #1 Breach Hydrograph

  22. Field Test #2 Embankment • Homogeneous (minimum cohesive) soils: • Clay and silt = 2% • Sand = 42% • Gravel = 56% • Embankment: • Height = 5.0 m • Length = 36 m • Slope = 1.7:1 (horz:vert) upstream and downstream • Crest: • Elevation = 369.81 m • Width = 2.0 m

  23. Field Test #2 at 0:30 h

  24. Field Test #2 at 1:00 h

  25. Field Test #2 at 1:30 h

  26. Field Test #2 at 2:00 h

  27. Field Test #2 at 6:00 h

  28. Field Test #2 Crest Profile

  29. Field Test #2Embankment Transect

  30. Field Test #1 Breach Hydrograph

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