Aaron Boone

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

Potential research and operational hydrology applications of WATER-HM

at Météo-France

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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)

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A new river flooding scheme for global climate and hydrological applications

ISBA

TRIP

The ISBA-TRIP coupling systemPrognostic variables:

•The river height, hs

•The river flow velocity, v (Manning formula)

•The floodplain volume (calculated using the sub-grid topography)

(Decharme et al., 2007, JGR, submitted)

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…

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Satellite-derived wetland estimates from Prigent et al. (2007, JGR).

% %

ISBA-TRIP flood-plain simulation

Difference

Spatial comparison between the Flood experiment

and the Satellite-derived wetland estimates

A new river flooding scheme for global climate and hydrological applications

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Assesment of a 10-year application of SIM-FranceComparison of the daily riverflow

Spatial repartition of the discharge error:

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

• Real-time monitoring of the water resources at the national scale

• Ensemble streamflow forecast studies

The SAFRAN-ISBA-MODCOU (SIM) hydrometeorological model applied over France

Habets, Boone, Champeaux, Etchevers, Franchistéguy, Leblois, Ledoux, Le Moigne, Martin, Morel, Noilhan, Quintana-Segui, Rousset, Viennot