Version 24 (modified by peylin, 11 years ago) (diff)


Summary of the 2-days ORCHIDEE meeting (13 and 14 of May 2013)

A 2 days meeting was organized in Jussieu to gather all developpers and users of ORCHIDEE in order to discuss the futur of the model developments concerning primarily the "Physic" of the modele. Few external contributors also came to provide an independant view of ongoing developments in other groups.

The meeting was successfull and around 70 people attended each day.. Below is the agenda with a link to the different presentations and few words about the "round table discussions"

Monday 14 morning session: overview of ORCHIDEE

Monday 14 Afternoon Session: Hydrology

  • Hydrology in ORCHIDEE - Past achievements and perspectives (A. Ducharne) (presentation)
  • "Hydrological data assimilation in LSMs - The experience of the ECMWF" (P. deRosnay, ECMWF) (presentation)
  • Hydrology in CNRM-CM climate model: development of a simple aquifer scheme (J.P. Vergne, CNRM) (presentation)
  • Modeling ground water of French river basin (F. Habets) (presentation)
  • Water uses evolution and ground-water reservoirs: operating rule with ODDYCCEIA: links with ORCHIDEE & perspectives (P. Dumas) (presentation)
  • Accounting for human impact on hydrology in ORCHIDEE (M. Guimberteau) (presentation)

Round table: The future of hydrology in ORCHIDEE: which ways? which collaborations ? We had a short discussion on how to improve the ORCHIDEE model which lead to the following remarks:

  • One priority should be the description of the soil depth, maximum soil water content and the root profile

that may evolve through time and depend on soil texture (A. Perrier); There are new database that provide these informations (especially for Europe). Variation in soil porosity may be crucial.

  • There is also some information on soil albedo based on soil texture, that we need to account for (F. Habets); we may also use the ECOCLIMAP maps.
  • Using detailed numerical models to characterise the "emergent properties" as a function of the scale that is considered could be investigatet (E. Mouche)
  • Link to ground water: need to distinguish Captive from non Captive ground water (A. Perrier)
  • Wee need to treat all types of flood-plains in ORC and merge the past developments (I. Gouttevin)

Tuesday 14 Morning Session: Coupling with the atmosphere

Round tables: The future challenge for ORC – LMDz coupling (F. Cheruy)

We only had a short discussion. We discussed the coupling between the Canopy boundary layer and the Planetary Boundary Layer of LMDZ; It turns out that coupling the two is a real scientific problem that needs to be investigated with caution. Challenges are linked to correctly represent the roughness and its impact on the atmospheric flow; where does u/v becomes zero (within the canopy ?); etc. We will investigate these issues together with LMDz developpers.

A second discussion concerned the coupling of ORCHIDEE with atmospheric models: direct through standard routines or using OASIS. The ongoing experience with OASIS used to couple ORC with WRF will guide us and help to see what it the most promising way for the futur.

Tuesday 14 Afternoon Session: Evaluation & Posters & Coding practices

ORCHIDEE in the Model Inter-comparison Projects (P. Ciais) (presentation)

Session on Evaluation (chair: N. Vuichard)

Presentation of the on-going effort towards a systematic evaluation chain (N. Vuichard); See his presentation here

Contributions from all:

Poster session with Coffee (F. Maignan)

Presentation of all posters (1 slide / poster ) by Fabienne Maignan presentation followed by a coffee brake around the posters.

ORCHIDEE code structure and its future evolution (F. Maignan & S. Luyssaert)

  • Current code structure and potential evolution (S. Luyssaert) presentation
  • Coding practicies from current developers (M. Mcgrath) presentation
  • The constraint for automatic code differentiation (M. Mancip) presentation

Round table: How to improve the ORCHIDEE code structure?

We started a constructive discussion in order to derive in the coming months a little document that will propose new coding guidelines in ORCHIDEE and a new routines/module strucuture. This effort is summarized under