HR: 0800h
AN: H31A-0119    [Abstracts]
TI: Evaluation of 1D numerical models in the prediction of distributed flow series constrained by radar altimetry data
AU: * Getirana, A C
EM: getirana@lmtg.obs-mip.fr
AF: COPPE/UFRJ, Cidade Universitàˇria Centro de Tecnologia, Bloco G, sala 101 Ilha do FundàŁo, Rio de Janeiro, RJ 21945-970, Brazil
AU: * Getirana, A C
EM: getirana@lmtg.obs-mip.fr
AF: LMTG/UPS, Observatoire Midi Pyrénées LMTG - UMR 5563 UR 154 CNRS 14 avenue Edouard Belin, Toulouse, 31400, France
AU: Bonnet, M
EM: bonnet@lmtg.obs-mip.fr
AF: LMTG/UPS, Observatoire Midi Pyrénées LMTG - UMR 5563 UR 154 CNRS 14 avenue Edouard Belin, Toulouse, 31400, France
AU: Roux, E
EM: emmanuel.roux@lmtg.obs-mip.fr
AF: LMTG/UPS, Observatoire Midi Pyrénées LMTG - UMR 5563 UR 154 CNRS 14 avenue Edouard Belin, Toulouse, 31400, France
AU: Rotunno, O C
EM: otto@oi.com.br
AF: COPPE/UFRJ, Cidade Universitàˇria Centro de Tecnologia, Bloco G, sala 101 Ilha do FundàŁo, Rio de Janeiro, RJ 21945-970, Brazil
AB: Recently, efforts have been done forward the development of methodologies to obtain flow estimates from time series of water height at virtual stations (VS - intersections between satellite tracks and water surfaces) from Topex/Poseidon (TP) and ENVISAT radar mission measurements. Relatively simple 1D propagation models such as Muskingum-Cunge (M-C) Routing Model have presented good results in the water flow propagation in Amazonian rivers. These regions suffer, in most cases, of lack of information witch constrains more accurate hydrologic and hydraulic studies. Nevertheless, these M-C models make a lot of simplification witch may cause the lost of important information that these quasi-ungaged basins can offer. This paper presents a comparison between two propagation models to the estimation of water flow series constrained by T/P and ENVISAT data. The models are: ProGUM, a Muskingum-Cunge flow routing model with diffusion-cum-dynamic wave propagation, and HEC-RAS, a well-known 1D hydrodynamic model. The verification was made in four reaches in the Negro River Basin. Each of these reaches are limited by two gauge stations, one upstream and the other one downstream. A total of five VS distributed over the reaches were analyzed. Previous studies have shown that ProGUM may yield errors less then 10% in validation phases. Here, it is demonstrated that, no much improvements can be achieved by using a more complete model capable to absorb the available data and simplifications of a M-C Model do not make significant modifications in the results of rating curve generation from satellite altimetry.
DE: 1847 Modeling
DE: 1855 Remote sensing (1640)
DE: 1856 River channels (0483, 0744)
DE: 1860 Streamflow
DE: 1874 Ungaged basins
SC: Hydrology [H]
MN: 2007 Fall Meeting