Aaron Boone WATER-HM SWG Meeting, Oct. 29-30, Washington, DC.

1. Potential research and operational hydrology applications of WATER-HM at Météo-France Aaron Boone WATER-HM SWG Meeting, Oct. 29-30, Washington, DC.

2. Potential research and operational hydrology applications of WATER-HM at Météo-France • I) Need to evaluate river routing and floodplain parameterizations for use in GCMs and regional scale modeling: • Used to study possible global climate change impacts on flood risk/frequency • Long term impact on lake storage: possible aid to water resource planning (seasonal and long term) • Better description of lake changes at high latitudes: links with freeze thaw, greenhouse gas release • NEED river depth, floodplain depth/extent, river velocity: WATER-HM probably adequate! • *End Result: Better river discharge/routing, lake parameterizations to be utilized within fully-coupled OGCM model (complete description of water cycle) • II) Operational Hydrological Forecasting: • Real-time monitoring of the water resources at the national level (France): SAFRAN-ISBA-MODCOU distributed hydrological modeling system • Ensemble streamflow forecast studies: initialized using current river heights: potential flood risk forcasted • NEED high spatial resolution (100m probably not fine enough?) and daily (?) observations • Potential uses in developing countries with relatively low spatial density observational discharge/river monitoring networks (eg. Western Africa)

3. The ISBA-TRIP coupling system TRIP ISBA A new river flooding scheme for global climate and hydrological applications • Prognostic variables: • The river height, hs • The river flow velocity, v (Manning formula) • The floodplain volume (calculated using the sub-grid topography) • Other important variables: • The flood fraction, fflood • The flood height, hf • Evaluations: • In-situ river discharge • Satellite-derived wetland estimates (Prigent et al., JGR, 2007) • WATER-HM derived v, depths, floodplain water depth… (Decharme et al., 2007, JGR, submitted)

4. A new river flooding scheme for global climate and hydrological applications Spatial comparison between the Flood experiment and the Satellite-derived wetland estimates % % Satellite-derived wetland estimates from Prigent et al. (2007, JGR). ISBA-TRIP flood-plain simulation Difference

5. Assesment of a 10-year application of SIM-France Comparison of the daily riverflow The SAFRAN-ISBA-MODCOU (SIM) hydrometeorological model applied over France Spatial repartition of the discharge error: • Real-time monitoring of the water resources at the national scale • Ensemble streamflow forecast studies Two kinds of Ensemble streamflow were tested: Long term : 10-day forecast, using ECMWF EPF (50 members + ctrl) Rousset et al., ECMWF Newsletter 2007 Short term: 2-day forecast, using PEARP EPF (10 members + ctrl) Thiriel et al., submitted 2007 *The SIM real-time application is used to initialize the ensemble streamflow forecast: could be improved using real-time WATER-HM Habets, Boone, Champeaux, Etchevers, Franchistéguy, Leblois, Ledoux, Le Moigne, Martin, Morel, Noilhan, Quintana-Segui, Rousset, Viennot