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DTSTART:20061029T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53315id
DTSTAMP:20260910T205823Z
DESCRIPTION:The terrestrial hydrologic cycle is a key driving force of biog
 eochemical cycles and is inherently linked to the energy balance through t
 he process of evapotranspiration (ET). Computational methods for simulatin
 g the terrestrial hydrologic cycle are often based on a separation of the 
 different components\, such as surface and groundwater flow\, and the abst
 raction of the land surface interface\, which is treated as a simplified b
 oundary condition. For example\, in groundwater flow models\, the upper bo
 undary condition commonly does not account for overland flow and the inter
 dependence of ET and soil moisture. On the other hand\, land surface model
 s only incorporate the shallow root zone and disregard deeper groundwater 
 flow acting on large temporal and spatial scales. \n\nIn this study\, new 
 approaches are tested to couple the surface-subsurface flow equations and 
 examine possible feedbacks across the land surface interface\, when ground
 water flow is incorporated into the mass and energy balance calculations o
 f land surface and climate models. ParFlow\, a parallel\, variably saturat
 ed groundwater flow model\, was extended to simulate surface-subsurface fl
 ow in an integrated fashion and modularly incorporate the land surface mod
 el CLM (Common Land Model). Hypothetical test cases are used to study the 
 interactions and uncertainty in mass and energy fluxes at the land surface
  due to subsurface flow and heterogeneity in the hydraulic properties. The
  Little Washita watershed\, Oklahoma\, was selected as a real-world test c
 ase for comparison to measured data and to study the two-way feedbacks fro
 m the subsurface across the land surface into the atmosphere and vice vers
 a. Results show uncertainties in hydrograph predictions arising from subsu
 rface heterogeneity. Land surface models do not account for the spatial va
 riability in soil moisture caused by heterogeneity and lateral groundwater
  flow\, which leads to uncertainty in the energy balance and differences i
 n characteristics of the atmospheric boundary layer.\n\nThis work was cond
 ucted under the auspices of the U. S. Department of Energy by the Universi
 ty of California\, Lawrence Livermore National Laboratory (LLNL) under con
 tract W-7405-Eng-48.\n
DTSTART;TZID=Europe/Berlin:20061116T161500
DTEND;TZID=Europe/Berlin:20061116T235959
LOCATION:H6
SUMMARY:Dr. Stefan Kollet\, Atmospheric\, Earth\, and Energy Sciences Depar
 tment Lawrence Livermore National Laboratory\, California: Terrestrial Hyd
 rologic Cycle Simulations: Crossing the Land Surface Interface
TRANSP:TRANSPARENT
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