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@PHDTHESIS{Steenpa:139798,
      author       = {Steenpaß, Christian},
      title        = {{C}oupled modeling of water, vapor and heat in unsaturated
                      soils – {F}ield applications and numerical studies},
      volume       = {167},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-05769},
      isbn         = {978-3-89336-854-9},
      series       = {Schriften des Forschungszentrums Jülich . Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {X, 123 S.},
      year         = {2013},
      note         = {Dissertation, RWTH Aachen, 2013},
      abstract     = {The present work is part of the Sonderforschungsbereich
                      TransregioCollaborative Research Center 32 (SFB/TR32). This
                      interdisciplinary research projectfocuses on interaction of
                      energy, water, and carbon between the domains of
                      soil,vegetation, and lower atmosphere and resulting patterns
                      of state variables. Soilsurface water content and
                      temperature patterns provide the lower boundary
                      foratmospheric and the upper boundary for hydrologic
                      problems, making the soil surfacean important interface
                      between both domains. Because of the strong non-linearity
                      ofsoil hydraulic properties (SHP), measureable soil water
                      content and, directly linked byevaporation, temperature
                      patterns develop even at relatively small scales of a
                      fewdecimeters. This link between temperature and water
                      content and the resultingformation of measureable patterns
                      within soils makes consideration of coupled heatand water
                      fluxes inevitable when trying to simulate or predict
                      underlying processes.The present work was conducted in the
                      first research period of SFB TR 32 and focuswas on near
                      surface fluxes and patterns in bare soils. Within this
                      context, the presentthesis consists of three key
                      objectives:First, the influence of neglecting thermal
                      effects on instantaneous fluxes suchas diurnal evaporation
                      and on state variables such as surface temperature and
                      watercontent is studied. Over a period of five days,
                      evaporation, water content andtemperature were calculated
                      using a coupled and an uncoupled modeling approach.Measured
                      meteorological data were taken as upper boundary condition.
                      Both modelswere run assuming wet and dry initial conditions.
                      Results show that with wet initialconditions, differences
                      between coupled and uncoupled approach are negligible. In
                      adry soil, differences in actual evaporation rate in both
                      model approaches resulted inrelatively large differences in
                      modeled soil surface temperatures (SST). In the upperpart of
                      the soil, influence of thermal and isothermal vapor flux
                      components has asignificant effect on the total net water
                      flux (as entirety of liquid water and vapor).Furthermore,
                      the enhancement factor (Cass et al. 1984) used to
                      compensate},
      keywords     = {Dissertation (GND)},
      cin          = {IBG-3},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / DFG project 15232683 - TRR 32:
                      Muster und Strukturen in
                      Boden-Pflanzen-Atmosphären-Systemen: Erfassung,
                      Modellierung und Datenassimilation (15232683)},
      pid          = {G:(DE-HGF)POF2-246 / G:(GEPRIS)15232683},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/139798},
}