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SUMMARY:Aggradation\, incision and lateral migration of alluvial rivers - 
 Fergus McNab\, GFZ Potsdam
DTSTART:20241023T130000Z
DTEND:20241023T140000Z
UID:TALK220456@talks.cam.ac.uk
CONTACT:Tom Merry
DESCRIPTION:Alluvial rivers are the main mechanism by which sediment is mo
 ved from eroding source regions to downstream basins. In response to chang
 ing climatic or tectonic boundary conditions\, they aggrade\, incise and a
 djust the rates at which they transport sediment. Their lateral migration 
 also builds fertile floodplains that large populations inhabit and cultiva
 te. I will present results from two modelling studies. First\, I explore h
 ow changing sediment supply\, precipitation rate or base level is recorded
  in fluvial terrace sequences and variations in downstream basin accumulat
 ion rates. I will discuss some general insights as well as preliminary res
 ults from a case study focused on major pro-glacial rivers in southern Pat
 agonia. Second\, I present a new model for the lateral evolution of alluvi
 al valleys\, which is based on random walk theory\, and provides analytica
 l descriptions of how valleys widen over time and the age distributions of
  sediment they deposit. This work moves us closer to quantitative interpre
 tation of alluvial landforms and stratigraphic archives in terms of past c
 limatic and tectonic environments\, and to accurate predictions of how the
 se systems will evolve in the future.
LOCATION:Wolfson Lecture Theatre
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