HR: 15:25h
AN: H53K-08    [Abstracts]
TI: Simulation of River and Floodplain Discharge Using SRTM DEM-derived Channel Profile Information in a Continental-scale Routing Model
AU: * Goteti, G
EM: ggoteti@uci.edu
AF: University of California Irvine, 1101 Croul Hall, Dept of Earth System Science, UC Irvine, Irvine, CA 92697-3100, United States
AU: Famiglietti, J S
EM: jfamigli@uci.edu
AF: University of California Irvine, 1101 Croul Hall, Dept of Earth System Science, UC Irvine, Irvine, CA 92697-3100, United States
AU: Asante, K
EM: asante@usgs.gov
AF: U.S. Geological Survey, EROS Data Center, Sioux Falls, SD 57198, United States
AB: Land surface models (LSMs), which happen to be the only available tools to simulate the hydrologic cycle at continental and global scales, have an inadequate representation of surface water movement and the associated spatio-temporal variations in surface water bodies such as lakes, rivers, floodplains and wetlands. Towards addressing this drawback of existing LSMs, we present a hydrologic modeling system which has an explicit representation of storage and movement of water in river channels and floodplains. The overall modeling system, called CHARMS, comprises of a LSM and a river routing model that operate on a network of hydrologic catchments. Boundaries of catchments and river flow paths in CHARMS were delineated from the 1 km GTOPO30 DEM. The LSM in CHARMS uses statistics of the DEM data to compute surface and subsurface runoff from each catchment. Using information on channel cross-section geometry derived from the 90 m SRTM DEM, the routing model transforms runoff to river discharge and partitions it into within-channel and floodplain components. CHARMS was implemented over some major river basins of the world and simulated streamflow was validated using observations. Simulated flow depth and inundation width generally followed the observed patterns of flooding and drought. The importance of topographic information in the simulation of surface water storage and movement is highlighted by this research work.
DE: 1800 HYDROLOGY
DE: 1804 Catchment
DE: 1820 Floodplain dynamics
DE: 1836 Hydrological cycles and budgets (1218, 1655)
DE: 1856 River channels (0483, 0744)
SC: Hydrology [H]
MN: 2007 Fall Meeting