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ORCHIDEE. Physical Processes in Orchidée . Hydrological Cycle. Evapotranspiration and Sensible heat flux : Sechiba N. Ducoudré , 1993 (de Noblet ) Soil water flow and soil moisture content: P. de Rosnay (2002) Ground water flow and G roundwater : J. Polcher (2005).

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PhysicalProcesses in Orchidée

Hydrological cycle
Hydrological Cycle

  • Evapotranspiration and Sensible heat flux : Sechiba N. Ducoudré, 1993 (de Noblet)

  • Soil water flow and soilmoisture content: P. de Rosnay (2002)

  • Ground water flow and

    Groundwater: J. Polcher


Trenberth, 2007

Sechiba evaporation
Sechiba: Evaporation

  • Impact of African and AmazonianDeforestation on climate: J. Polcher, 1994

  • Comparison of Sechiba and Bats coupled to NCAR GCM: P. Peylin 1997

  • Evapotranspiration: A. Barella-ortiz and T. d’Orgeval

  • Modelling of root water

    uptake: P. de Rosnay and

    J. Polcher (1998)

    The simulatedsoilmoistureis the most sensitive to water uptakeparameter. This has been underlined in a study by Matthieu Guimberteau (2012)

Study over illinois m guimberteau 2012
Study over Illinois, M. Guimberteau, 2012

SoilMoisure Index

Model forced by NLDAS dataset

Soil moisture content 2 layers
Soilmoisture content:2 layers

I have introducedthis 2 layers Model during Hui Ding thesis (1989)

Itsinterestwas to allowpotentialevapotranspirationafter a rain.

You must keep the upper layer thinenough:

Drainage betweenupper and lower layer (A. Ducharne, 1998)

Influence of soil water holding capacity on water cycle

(A. Ducharne, 2000)

Irrigation and flood plains sechiba gw polcher
Irrigation, and flood plains(Sechiba+GWPolcher)

  • Irrigation P. de Rosnay, and flood plains T. d’Orgeval

  • Irrigation over Ganges bassin:

    delaysmonsoononset (M. Guimberteau, 2012)

    (S. Shukla, et al, 2013: irrigation has to beincluded to simulaterealisticallymonsoonsince 1960)

Guimberteau, 2010

Origin of the warming hole irrigation from ogallala aquifer
Origin of the Warminghole? Irrigation fromOgallalaaquifer?

De Angelis et al, 2010

How to improve soil moisture simulations
How to improvesoilmoisture simulations?

We have to decrease the uncertainties on drought.

PDSI index is not reliable.

Mo et al, 2011: study over USA.

  • Twoexamples

The role of resolution in the simulation of hydrological cycle over iberian peninsula
The role of resolution in the simulation of hydrological cycle over IberianPeninsula

Sensitivity of the Hydro Cycle, Sylvie Vérant, 2004

Resolutionincreases interception decreases, evpaorationdoes not change.

But the soilmoistureincreases

Soil moisture in gcm experiment de rosnay parameterization 2002
Soilmoisture in GCM experiment: de Rosnay parameterization (2002)

Comparisonbetween 2 versions of


Dependence on soil texture

Groundwater flow effect on sea level height ngoduc et al 2005
Groundwater flow : effect on sealevelheight (NgoDuc et al, 2005)

Observation from Jason

In the future the decrease of uncertainties
In the Future: The decrease of uncertainties

  • High resolution

  • Improve the prediction of agricultural drought.


  • Water Ressources (and sealevelheight): Konikov, 2011.

  • Include all anthropogenic changes

The physical processes must be improved
The physicalprocesses must beimproved

Relation withBoundary layer:

Ek, M., and L. Mahrt, 1991: A formulation for boundary-layercloudcover. Ann. Geophys., 9, 716–724.

Holtslag, and M. Ek, 1996: Simulation of surface fluxes and boundary layer development over the pine forest in HAPEX–MOBILHY.J. Appl. Meteor., 35, 202–213.

Cheruy et al

Recycling of land precipitation:

Risi et al

Thank you

Interaction between surface and abl cheruy et al 2013
Interaction between surface and ABL (Cheruy et al, 2013)