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TZUNTIL:20281029T010000Z
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DTSTART:20261025T030000
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RDATE:20271031T030000
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DTSTAMP:20261104T085443Z
DESCRIPTION:Forget divining rods and crystal balls\; if you want to know th
 e inner workings of a watershed\, ask the stream. Streamflow acts as a hyd
 ro-biogeochemical oracle\, carrying stories of the hidden and hard to meas
 ure processes that transform precipitation into river chemistry. But much 
 like an oracle\, a stream&rsquo\;s story can be ambiguous. Landscape struc
 ture\, hydrology\, and biogeochemical processes all jointly shape water qu
 ality\, making their relative importance notoriously hard to disentangle. 
 In this talk\, I will show how combining field observations with watershed
 -scale reactive transport modelling helps untangle the hydro-biogeochemica
 l processes controlling stream chemistry. First\, mountain catchments are 
 examined to determine how vegetation\, vertical and spatial solute distrib
 ution\, and hydrologic connectivity govern the magnitude and timing of str
 eam carbon signals. This framework is then extended to urban catchments\, 
 where stormwater networks and impervious surfaces disrupt flow paths and i
 ntroduce overlapping chemical signals that obscure source inputs. In this 
 work\, stable carbon isotopes are coupled with RTMs to separate overlappin
 g sources and flow paths. &nbsp\;Ultimately\, this work demonstrates that 
 pairing targeted field data with process-based RTMs offers a powerful way 
 to dig into complex water quality questions as climate and land-use change
  accelerate.
DTSTART;TZID=Europe/Berlin:20261105T000000
DTEND;TZID=Europe/Berlin:20261105T235959
SUMMARY:Dr Devon Kerins\, Assistent Professor\, University College Dublin (
 UCD)\, Irland (Homepage): From Mountains to Cities: Simulating stream chem
 istry to trace flow paths and solute sources across landscapes
TRANSP:TRANSPARENT
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