HR: 15:00h
AN: H43I-06 INVITED    [Abstracts]
TI: Diagnosing coupled watershed processes using a fully-coupled groundwater, land-surface, surface water and mesoscale atmospheric model
AU: * Maxwell, R M
EM: maxwell5@llnl.gov
AF: Atmospheric, Earth, and Energy Sciences Department, Lawrence Livermore National Laboratory, 7000 East Ave (L-206), Livermore, CA 94550, United States
AU: Kollet, S J
EM: stefan.kollet@uni-bonn.de
AF: Meteorological Institute, Bonn University, Auf dem Huegel 20, Bonn, 53121, Germany
AU: Chow, F K
EM: tinakc@berkeley.edu
AF: Dept. of Civil and Environmental Engineering, University of California, 621 Davis Hall MC 1710 University of California, Berkeley, Berkeley, CA 94720-1710, United States
AB: A variably-saturated groundwater flow model with an integrated overland flow component, a land-surface model and a mesoscale atmospheric model is used to examine the interplay between coupled water and energy processes. These processes are influenced by land-surface topography and subsurface heterogeneity. This parallel, integrated model simulates spatial variations in land-surface forcing driven by three-dimensional (3D) atmospheric and subsurface components. Spatial statistics are used to demonstrate spatial and temporal correlations between surface and lower atmospheric variables and water table depth. These correlations are particularly strong during times when the land surface temperatures trigger shifts in wind behavior, such as during early morning surface heating. Additionally, spectral transforms of subsurface arrival times are computed using a transient Lagrangian transport simulation. Macrodispersion is used to mimic the effects of subsurface heterogeneity for a range of Peclet numbers. The slopes of these transforms indicate fractal scaling of this system over a range of timescales. All of these techniques point to importance of realistically representing coupled processes and the need to understand and diagnose these processes in nature. 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. This project was funded by the Laboratory Directed Research and Development Program at LLNL
DE: 1830 Groundwater/surface water interaction
DE: 1839 Hydrologic scaling
DE: 1843 Land/atmosphere interactions (1218, 1631, 3322)
DE: 1847 Modeling
DE: 1879 Watershed
SC: Hydrology [H]
MN: 2007 Fall Meeting