CLMT2 user's guide: A Coupled Model for Simulation of HydraulicProcesses from Canopy to Aquifer Version 1.0

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Description

CLMT2 is designed to simulate the land-surface andsubsurface hydrologic response to meteorological forcing. This modelcombines a state-of-the-art land-surface model, the NCAR Community LandModel version 3 (CLM3), with a variably saturated groundwater model, theTOUGH2, through an internal interface that includes flux and statevariables shared by the two submodels. Specifically, TOUGH2, in itssimulation, uses infiltration, evaporation, and root-uptake rates,calculated by CLM3, as source/sink terms; CLM3, in its simulation, usessaturation and capillary pressure profiles, calculated by TOUGH2, asstate variables. This new model, CLMT2, preserves the best aspects ofboth submodels: the state-of-the-art modeling capability of surfaceenergy and hydrologic processes from CLM3 (including snow, runoff,freezing/melting, ... continued below

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Pan, Lehua July 26, 2006.

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Description

CLMT2 is designed to simulate the land-surface andsubsurface hydrologic response to meteorological forcing. This modelcombines a state-of-the-art land-surface model, the NCAR Community LandModel version 3 (CLM3), with a variably saturated groundwater model, theTOUGH2, through an internal interface that includes flux and statevariables shared by the two submodels. Specifically, TOUGH2, in itssimulation, uses infiltration, evaporation, and root-uptake rates,calculated by CLM3, as source/sink terms; CLM3, in its simulation, usessaturation and capillary pressure profiles, calculated by TOUGH2, asstate variables. This new model, CLMT2, preserves the best aspects ofboth submodels: the state-of-the-art modeling capability of surfaceenergy and hydrologic processes from CLM3 (including snow, runoff,freezing/melting, evapotranspiration, radiation, and biophysiologicalprocesses) and the more realistic physical-process-based modelingcapability of subsurface hydrologic processes from TOUGH2 (includingheterogeneity, three-dimensional flow, seamless combining of unsaturatedand saturated zone, and water table). The preliminary simulation resultsshow that the coupled model greatly improved the predictions of the watertable, evapotranspiration, and surface temperature at a real watershed,as evaluated using 18 years of observed data. The new model is also readyto be coupled with an atmospheric simulation model, representing one ofthe first models that are capable to simulate hydraulic processes fromtop of the atmosphere to deep-ground.

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  • Report No.: LBNL--60857
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/900656 | External Link
  • Office of Scientific & Technical Information Report Number: 900656
  • Archival Resource Key: ark:/67531/metadc888510

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  • July 26, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 2:02 p.m.

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Pan, Lehua. CLMT2 user's guide: A Coupled Model for Simulation of HydraulicProcesses from Canopy to Aquifer Version 1.0, report, July 26, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc888510/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.