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UID:www.bayceer.uni-bayreuth.de-bayceer-t164377id
DTSTAMP:20260821T120019Z
DESCRIPTION:'Soil hydrological modeling' is the numerical simulation of the
  transport of water and associated heat\, solutes\, and gases in the near-
 surface (&ldquo\;vadose&rdquo\;) zone of the subsurface. Of particular int
 erest\, in addition to the state of the soil\, are fluxes to groundwater a
 nd across the soil-plant-atmosphere continuum to the free atmosphere. The 
 scale of interest ranges from centimeters to a few meters vertically\, and
  extends horizontally from a few meters for point processes up to watershe
 ds for regional studies.\nSoil hydrology modeling is important for a varie
 ty of applications\, notably in the context of increasing water scarcity a
 nd climate change around the world. Traditionally\, simulations are done b
 y the disciplines of soil physics or hydrology ('vadose zone hydrology&rdq
 uo\;)\, which differ in their approach to scale. While soil physics applie
 s bottom-up approaches based on pore-scale concepts to represent the behav
 ior of water in porous media in a process-based manner and to infer the ef
 fective behavior at the scale of interest through integration\, physical h
 ydrology goes the other way\, and tries to use statistics-based observatio
 ns at the scale of interest to arrive at effective modeling formulations. 
 Unfortunately\, the closure of the scale gap from typical soil physics sca
 les to the larger scales of interest has not been achieved to date. Provoc
 atively put\, hydrology begins at a larger scale than that of soil physics
  ends. Nevertheless\, the effects of small-scale processes on large-scale 
 behavior can be substantial\, so that ignorance of certain small-scale pro
 cesses will cause macroscopic errors. This can significantly impede scient
 ific progress and distort fundamental considerations.\nThis will be illust
 rated by two examples dealing with 'hydraulic functions of drying soils'. 
 One case study affects evaporation estimates. Here\, we will show how the 
 numerical simulation of evaporation is affected by the microscale process 
 of 'film flow'\, which is completely ignored in traditional hydrological m
 odels. The second example deals with high-voltage lines embedded in the gr
 ound that transport renewable energy from northern to southern Germany. Th
 e heating leads to drying of the surrounding soil in the vicinity of power
  cables. The simulated cable temperature depends on how the hydraulic prop
 erties are parameterized. In both cases\, we find that the parameterizatio
 n of hydraulic properties (admittedly a very special topic of soil hydrolo
 gy) has a significant impact on large-scale processes.\n*** invited by Efs
 tathios Diamantopoulos\, Soil Physics
DTSTART;TZID=Europe/Berlin:20230112T000000
DTEND;TZID=Europe/Berlin:20230112T235959
SUMMARY:Prof. Dr. Wolfgang Durner\, Leiter der Abteilung Bodenkunde und Bod
 enphysik\, TU Braunschweig (Homepage): Challenges in Soil Hydrological Mod
 eling - The Devil is in the Details
TRANSP:TRANSPARENT
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