HR: 1340h
AN: H13C-0421    [Abstracts]
TI: Implementing a new multi-scale flow network routing scheme in a land surface model
AU: * Guo, J
EM: jguo@ce.berkeley.edu
AF: Department of Civil and Environmental Engineering, University of California at Berkeley, 631 Davis Hall, Berkeley, CA 94720-1710
AU: Liang, X
EM: liang@ce.berkeley.edu
AF: Department of Civil and Environmental Engineering, University of California at Berkeley, 631 Davis Hall, Berkeley, CA 94720-1710
AU: Leung, L
EM: ruby.leung@pnl.gov
AF: Atmospheric Science and Global Change Resource, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352
AB: This paper first presents a new multi-scale approach to generate the flow network for land surface models at different spatial scales. The new approach has two advantages: (1) it allows runoff in a land surface model grid to exit through multiple directions simultaneously rather than through only one of the eight discrete directions as in many other methods (i.e., either to adjacent or diagonal neighbor according to the steepest downward slope); and (2) it introduces a concept of the elastic coefficient to determine hydrologic parameters for more accurate flow routing across different spatial scales. The flow network generated by the new multi-scale approach in conjunction with a kinematic wave model is fully coupled and implemented in the VIC-3L (Three-Layer Variable Infiltration Capacity) model to test the applicability of the new approach for land surface models across scales. The watershed of Illinois River at Gore in Oklahoma is selected for the case study. Improvements on streamflow simulations by the new multi-scale approach and the impacts on evapotranspiration and soil moisture simulations will be presented and discussed at different spatial resolutions. The new multi-scale flow network generation approach can be easily implemented in other land surface models.
DE: 1818 Evapotranspiration
DE: 1836 Hydrologic budget (1655)
DE: 1848 Networks
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting