Aaron Boone

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
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
Spatial repartition of the discharge error
The SAFRAN-ISBA-MODCOU (SIM) hydrometeorological
model applied over France

• 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