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SUMMARY:What controls sediment bypass in submarine channels?: Insights fro
 m turbidity current modelling applied to the Hikurangi Margin\, New Zealan
 d - Adriana Crisostomo-Figueroa\, University of Leeds
DTSTART:20220307T180000Z
DTEND:20220307T190000Z
UID:TALK170357@talks.cam.ac.uk
CONTACT:Eloise Matthews
DESCRIPTION:"Sediment bypass is a key process in turbidity current dynamic
 s for its role in the distribution of sediment in deep-marine systems. Nev
 ertheless\, predicting when turbidity currents are bypassing or deposition
 al (i.e.\, leaving no depositional record versus leaving a deposit) remain
 s challenging. Using 100 m resolution bathymetric data and high-resolution
  3D seismic data of the East Coast Basin\, New Zealand\, we extracted morp
 hometrics from two submarine slope channels and applied a modelling approa
 ch that 1) estimates turbidity current velocity and bulk sediment concentr
 ation through the flow superelevation method\, and 2) calculate thresholds
  for net erosional\, equilibrium\, or net depositional flow through a flow
 -power flux-balance type sediment transport model. We demonstrate that the
  flow height\, slope gradient and grain-size distribution in the flow dete
 rmines the down-dip patterns of potential turbidite deposits. Thicker flow
 s and those carrying well-sorted suspensions\, can bypass sediment over lo
 wer slopes than thinner flows and those carrying more poorly-sorted suspen
 sions. Furthermore\, the predicted sand distribution maps deposited by poo
 rly-sorted flows in the channels show good agreement with root mean square
  amplitude mapping of the seafloor. Knowledge of the conditions under whic
 h turbidity currents bypass sediment can increase our understanding of the
  sedimentary processes in deep-marine systems and constrain interpretation
 s of turbidite deposits on modern and ancient systems."
LOCATION:Tilley Lecture Theatre\, Department of Earth Sciences\, Downing S
 ite
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