HR: 10:50h
AN: H12B-03 [Abstracts]
TI: Incorporating coupled groundwater and surface water processes within a land surface model.
AU: * Maxwell, R M
EM: maxwell5@llnl.gov
AF: Environmental Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue (L-208),
Livermore, CA 94550
United States
AU: Kollet, S J
EM: kollet2@llnl.gov
AF: Environmental Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue (L-208),
Livermore, CA 94550
United States
AU: Miller, N L
EM: NLMiller@lbl.gov
AF: Earth Sciences Division, Lawrence Berkeley National Laboratory, 90-1116 One Cyclotron Drive, Berkeley,
CA 94720
United States
AB:
Traditional Land-Surface Models (LSM) used for numerical weather prediction, climate projection, and as inputs to water
management decision support systems, often do not treat the subsurface in a fully process-based fashion. Conversely, models
for fully and variably saturated groundwater flow, while addressing important features such as subsurface heterogeneity and
three-dimensional flow, often have overly simplified upper boundary conditions that ignore soil heating, runoff, snow and
root-zone uptake. In the present study, a distributed LSM (CLM2.0), a three-dimensional, variably saturated groundwater model
(ParFlow) and a two-dimensional surface-water, overland flow model have been dynamically coupled as a single model. A set
of simulations will be presented that are based on data from the Project for Intercomparison of Land-surface Parameterization
Schemes (PILPS) Usadievskiy catchment in Valdai, Russia. These simulations using this distributed, coupled model
investigate uncertainty, scale and the representation of important land surface processes such as runoff, infiltration and
lateral subsurface flow. The coupled model will ultimately be used to assist in the management of an urban watershed in the
United States.
This work was conducted under the auspices of the U. S. Department of Energy by the University of California, Lawrence
Livermore National Laboratory (LLNL) under contract W-7405-Eng-48 and Lawrence Berkeley National Laboratory (LBNL) under
contract DE-AC03-76F00098.
DE: 1829 Groundwater hydrology
DE: 1860 Runoff and streamflow
DE: 1869 Stochastic processes
DE: 1875 Unsaturated zone
DE: 1878 Water/energy interactions
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting