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SUMMARY:EESS talk on "Sediment Supply: The Underrated Ruler in Bedload Tra
 nsport"
DTSTART:20170919T121500
DTEND:20170919T131500
DTSTAMP:20260601T063848Z
UID:77cb0dea7e91f03db3fc9b4898f6426c5e855fbb22b1cb53c58cef96
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Francesco Comiti\, Associate professor\, River Basin Group\
 , Faculty of Science and Technology\, Free University of Bozen-Bolzano (It
 aly)\n\nShort biography:\nDr. Francesco Comiti (born in Venezia\, Italy\, 
 in 1975) is associate professor at the Free University of Bozen-Bolzano (F
 aculty of Science and Technology) since 2015. He obtained his PhD at the U
 niversity of Padova in 2004\, and later in 2007 he was Fulbright Visiting 
 Scholar at Colorado State University (U.S.A.). Current teaching activities
  include rural hydrology and hydraulics\, management of natural hazards\, 
 hydromorphology and sediment transport in mountain rivers.  His research 
 focuses on the monitoring of water\, sediment and wood fluxes in mountain 
 basins\, including ecohydrological dynamics\,  long-term river changes an
 d geomorphic response to flood and debris flow events. He is currently ass
 ociate editor for “Water Resources Research” and member of the Editori
 al board of “Geomorphology”.\nAbstract:\nHigh-elevation catchments are
  highly dynamic systems which are undergoing rapid hydrological changes. S
 easonally\, headwaters are responsible for the transport of large volumes 
 of runoff and sediment (fine and coarse) to the downstream channel network
 \, which tend to adjust to the upstream-imposed liquid and solid fluxes. P
 redicting how mountain rivers will change under different future climatic 
 scenarios is key for their sound management. But\, do we know enough on ho
 w bedload transport works to aim at such an ambitious goal ?\nThe presenta
 tion will focus on recent results obtained in two glacierized basin of the
  Eastern Italian Alps\, where runoff and sediment transport have been moni
 tored since 2011. An array of different methodologies to measure sediment 
 transport (both suspended and bedload) have been deployed. In parallel\, h
 ydrologic tracers were used to understand timing and relative contribution
  to runoff of different water sources. Additionally\, morphological monito
 ring of the main channel was carried out. Results indicate that the relati
 onship between sediment transport and water discharge is strongly season-d
 ependent\, with bedload rates and suspended sediment concentrations consis
 tently much higher (1-2 orders of magnitude) during glacier melt than duri
 ng snowmelt flows\, for identical water discharges. Contrasting hysteresis
  loops were found for bedload and suspended transport in relation with sno
 w- vs. ice melt flows\, highlighting the complexity of sediment supply mec
 hanisms in mountain basins. In contrast\, the inclusion of sediment supply
  variations – which  require the identification of time-varying sedimen
 t sources and of their connectivity to the channel network – in bedload 
 transport predictions for both scientific and practical purposes is widely
  neglected. Indeed\, the traditional application of transport capacity-bas
 ed estimations may lead to highly erroneous bedload yields\, and in turn t
 o wrong forecast on the expected morphological changes in river systems.
LOCATION:GR C0 01 https://plan.epfl.ch/theme/generalite_thm_v2?room=GR%20C
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STATUS:CONFIRMED
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