BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Margaret DiGiorno: M.S. defense
X-WR-TIMEZONE:Mountain Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260911T225557Z
UID:tag:localist.com\,2008:EventInstance_40688821207405
DTSTART:20220815T160000Z
DTEND:20220815T180000Z
DESCRIPTION:Resolving flow-dependent indicators of groundwater exchange in 
 the Columbia River\, WA\n\nHydrologic exchange flows (HEFs)\, which are th
 e movement of water between a river channel and the adjacent subsurface\, 
 are important for water quantity\, quality\, and ecosystem function. The s
 patial distributions of HEFs in streams are influenced by hydrologic condi
 tions in the aquifer\, hydraulic conditions in the channel\, and the spati
 al distribution of permeability under and around the channel. Exchange wit
 h adjacent aquifers is less well understood in large rivers because tracer
  injections are much more difficult due to water depth and higher flows th
 an in small streams where they have been used extensively. In this study w
 e ask whether large-scale geologic units in the area drive HEF locations m
 ore than the finer-scale sediment types and the riverbed morphology along 
 a 75 km reach of the Columbia River near the Hanford Site in eastern Washi
 ngton.\n\nTo determine the locations of HEFs we measured temperature\, spe
 cific conductance\, and dissolved Radon-222 along the riverbed during thre
 e sampling events in 2021/2022. We used a FloaTEM system to identify the l
 ocations of changes in the large-scale geology and compared these to the l
 ocations of HEFs. Though each method we used had some shortcomings togethe
 r they provided a more complete picture of what drives HEF locations. We o
 bserved water quality anomalies in similar locations to 3D numerical model
 ing experiments and past field research in the study area\, but we did not
  find a single factor that completely explained the locations of HEFs. Tho
 ugh sensitive to surface water inflows\, our method is useful for quickly 
 surveying long reaches of river and determining locations for more in-dept
 h investigations of HEF dynamics.
LOCATION:SEEC S372B or Zoom
SUMMARY:Margaret DiGiorno: M.S. defense
URL;VALUE=URI:https://calendar.colorado.edu/event/ms_defense_margaret_digio
 rno
END:VEVENT
END:VCALENDAR