HR: 1330h
AN: H22B-0912    [PDF]
TI: Assimilation of Observed Discharge Records Into a Lumped Hydrological Model Using an Extended Kalman Filter
AU: * Pauwels, V R
EM: Valentijn.Pauwels@UGent.be
AF: Laboratory of Hydrology and Water Management, Ghent University Coupure links 653, Ghent, 9000 Belgium
AU: Verhoest, N E
EM: Niko.Verhoest@UGent.be
AF: Laboratory of Hydrology and Water Management, Ghent University Coupure links 653, Ghent, 9000 Belgium
AU: Hoeben, R
EM: Rudi.Hoeben@UGent.be
AF: Laboratory of Hydrology and Water Management, Ghent University Coupure links 653, Ghent, 9000 Belgium
AU: De Troch, F F
EM: Francois.DeTroch@UGent.be
AF: Laboratory of Hydrology and Water Management, Ghent University Coupure links 653, Ghent, 9000 Belgium
AB: The objective of this research is to investigate the possibility to improve discharge forecasts from a lumped hydrological model (TOPLATS) through the continuous assimilation of discharge observations. An extended Kalman filter is used as assimilation algorithm. Model simulations are performed over the Zwalm catchment in Belgium at an hourly time step from 1994 through 1998. A simple online routing scheme is applied to the modeled discharge values in order to allow the assimilation of the observed discharge records at every time step. The modeled soil moisture contents and water table levels are updated through the Kalman filtering procedure. The overall improvement in the modeled discharge peaks is quantified. The assimilation scheme is also run in a flood forecasting mode. In this mode, a two-month spin-up period, in which all available discharge data are assimilated, proceeds the forecasting period. The improvement in the forecasted discharge peaks, as a consequence of the data assimilation during the model spin-up, is assessed. This research is expected to lead to a framework to improve flood forecasts from lumped hydrological models, through the continuous assimilation of operational discharge observations.
DE: 1800 HYDROLOGY
DE: 1821 Floods
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2003 Fall Meeting