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TZUNTIL:20190331T010000Z
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DTSTART:20161030T030000
TZOFFSETFROM:+0200
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RDATE:20171029T030000
RDATE:20181028T030000
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BEGIN:VEVENT
UID:www.bayceer.uni-bayreuth.de-bayceer-t140406id
DTSTAMP:20260812T220103Z
DESCRIPTION:In many regions of the world\, large systems of shallow water b
 odies include hundreds and thousands of lakes and wetlands\, integrated wi
 th climate- and human-controlled groundwater. In some cases\, like in Chin
 a and Mongolia\, a dramatic reduction of areas and numbers of such lakes i
 s observed. Disparity between spatial-temporal scales of each surface-wate
 r body and the entire system presents grand challenge to their modeling\, 
 and practical approaches are needed.\nWe explore feasibility of modeling f
 or the Nebraska Sand Hills (48\,000 km2)\, a large\, grass-stabilized dune
  region containing thousands of small closed-basin lakes and wetlands in h
 ydraulic connection with the Northern High Plains Aquifer. Instead of trac
 king lakes individually\, we identify lakes as areas where the simulated r
 egional water table exceeds land surface elevation DEM\, and wetlands as a
 reas where the water table is within 3 m from the land surface. Baseflow\,
  the total area\, and numbers of lakes and wetlands were simulated using a
  calibrated groundwater flow model.Major driver of the water table-groundw
 ater recharge (GR)\, critical to the existence of lakes and wetlands in th
 e semi-arid climate was assessed as decadal averages of the differences be
 tween precipitation and evapotranspiration. Both modern GR and the 21st ce
 ntury GR scenarios were considered. Median\, wet\, and dry GR scenarios we
 re obtained from sixteen downscaled Global Circulation Models and three gr
 eenhouse emission scenarios\, accounting for uncertainty in forecasts. Res
 ults indicate mild increase of lake and wetland numbers and total areas fo
 r median GR scenario by the end of century. More dramatic changes can be e
 xpected\, if wet or dry GR scenarios will be realized. However\, some coun
 terintuitive relationships between different scenarios are possible at int
 ermediate times. Results are consistent with studies of GR in the High Pla
 ins and indicate feasibility of proposed approach.\n****invited by Sven Fr
 ei\, Hydrology
DTSTART;TZID=Europe/Berlin:20170504T140000
DTEND;TZID=Europe/Berlin:20170504T153000
LOCATION:H 10\, NW I
SUMMARY:Prof. Vitaly Zlotnik\, Department of Earth and Atmospheric Sciences
 \, University of Nebraska-Lincoln\, USA (Homepage): An approach to simulat
 ion of large lake-aquifer-systems: Semi-arid Nebraska Sandhills\, USA
TRANSP:TRANSPARENT
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