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DTSTAMP:20260914T205759Z
SUMMARY:Mechanics of embankment breaching by overtopping. Lessons learned f
 rom laboratory scale models and numerical simulations
DESCRIPTION:Abstract: There are tens of thousands of constructed earthfill
  dams in the world. Some will be removed because its benefits no longer ou
 tweigh their negative impacts on river ecosystems and communities. Some wi
 ll fail. A dam failure is a traumatic event that affects communities for g
 enerations. Planners\, owners\, civil protection agents and valley communi
 ties need tools to foresee the time scales of flooding due to dam is overt
 opping.\nThis lecture describes contributions for a deeper understanding o
 f the erosive processes that determine the breach evolution and consequent
  hydrograph. It attempts answers to the following questions:\n– How do m
 aterial discontinuities in zoned dams affect the kinematics and dynamics o
 f breaching? What impacts in time to peak\, on flow hydrograph and on bulk
  erosion rates?\n– What hydrodynamic and soil mechanics processes are ne
 eded to construct a sound conceptual model for dam breaching – “as sim
 ple as possible\, but not simpler”? How much detail is needed in describ
 ing hydraulic erosion\, sloughing and undercutting?\n– Given that some h
 ydrodynamic processes do not obey Froude scaling and that bulk erodibility
  does not obey any hydrodynamic scaling\, what can be learned from testing
  small laboratory dams and numerical simulations to understand scale effec
 ts?\nShort bio: Rui M.L.Ferreira is a researcher and professor at Institut
 o Superior Técnico\, Universidade de Lisboa\, training students and condu
 cting fundamental research in characterization of turbulence over rough wa
 lls and canopies\, mechanics of bedload transport\, and fluid-structure in
 teractions and applied research involving modelling of debris-flows\, dam-
 break flows and tsunamis. He coordinates the development of laboratory ins
 trumentation\, including PIV\, optical flow and bedload measuring systems\
 , and of the mathematical modelling tool HiSTAV. He is Associate Editor of
  Water Resources research\, Journal of Hydraulic Engineering and Advances 
 in Water Resources and has been guest editor in several international jour
 nals. Has been a member of the leadership team of the Fluvial Hydraulics C
 ommittee\, Chair of the Experimental Methods and Instrumentation Committee
  of IAHR and is a IAHR Fellow.
URL:https://www.imperial.ac.uk/events/213128/mechanics-of-embankment-breach
 ing-by-overtopping-lessons-learned-from-laboratory-scale-models-and-numeri
 cal-simulations/
DTSTART;TZID=Europe/London:20260916T150000
DTEND;TZID=Europe/London:20260916T160000
LOCATION:TBC\, Skempton Building\, South Kensington Campus\, Imperial Colle
 ge London\, London\, SW7 2AZ\, United Kingdom
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