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ESCAPE-2 VVUQ Workshop

Saint-Rémy-lès-Chevreuse, France, 23 - 24th April 2019

Workshop description

This workshop will serve as a basis for the definition of a common VVUQ (Verification Validation and Uncertainty Quantification) framework as to be applied in Numerical Weather Prediction. Both URANIE and NWP communities need to agree on a common language and framework to be able to apply VVUQ analysis on the various dwarfs and codes at hand in the ESCAPE-2 project. It is part of the deliverables of WP4.

This workshop will also serve as an exchange basis for the coming tasks of WP4 concerning the handling of high dimensionality. The first discussions on how this should be handled and what are the potential approaches will take place.


The workshop presentations are public, but, for organisation purposes, all participants must duly register.

Workshop Result Summary

Extensive descriptions of the VVUQ methodologies as performed on both the URANIE and NWP communities were presented, allowing the various members of the project to become more familiar with both approaches.

Thanks to the presentation of W. Edeling, the link was also made with the VECMA H2020 project where UQ analysis plays a critical role.

The workshop hence allowed to precise:
  1. The common notions that everyone should (physical parameters vs initial conditions, verification vs validation, etc...). Those concepts will form the backbone of the deliverable to come.
  2. The work that will be performed in the rest of the project, notably the fact that the focus will mainly be on the UQ analysis of physical parameters.
  3. In-depth the functionalities of the URANIE tool, as well as first results on how to apply it for NWP analysis.
Finally, in parallel of the workshop BSC and CEA discussed about technical aspects of the current status of the URANIE code and how to improve the workflow internals and specific I/O management issues.

The main outcome of the workshop will be deliverable D4.1 published in June 2019.

Agenda & Presentations

 Tuesday, 23rd April 2019
Time Title  Presenter 
13:00 Introduction Adrien Bruneton
13:15 - 14:15 VVUQ Semantics - URANIE Community Guillaume Perrin
14:15 - 15:15 VVUQ Semantics - NWP Commuity Peter Dueben, Pirkka Ollinaho
15:15 - 15:45 Coffee Break
15:45 - 16:15 URANIE application on a toy model Rudy Chocat
16:15 - 16:30 First steps in the application of URANIE on a dwarf Rudy Chocat
16:30 - 16:45 Discussion and exchange  
16:45 - 17:45
State of the art in the VVUQ for NWP Pirkka Ollinaho
17:45 - 18:00 Discussion and exchange
18:00 Adjourn (Evening Social Event)   
Wednesday, 24th April 2019
 Time Title  Presenter 
09:00 - 09:30 Numerical precision - VECMA Wouter Edeling
09:30 - 10:00 A concrete example: work on numerical precision in NEMO Oriol Tinto
10:00 - 10:30 Coffee Break
10:30 - 11:00 Approximate Bayesian Computation Ritabrata Dutta
11:00 - 12:00 Discussion and exchange on high dimension  
12:00 - 13:30 Lunch Break
13:30 - 13:45 Proposal of VVUQ framework for NWP with URANIE CEA
13:45 - 15:00 Discussion and exchange on the deliverable D4.1
15:00 Closing Remarks and end of workshop Adrien Bruneton

Location and access details

The workshop will take place at

    Domaine de Saint Paul
    102 Route de Limours
    78470 Saint-Rémy-lès-Chevreuse

The location is accessible from Orly airport, and from Paris Gare du Nord (arrival of Thalys and Eurostar) thanks to RER B (suburban train in and around Paris), train stop "Saint-Remy-les-chevreuse".

Transport will be organized from the station to the domain with a dedicated shuttle running from 12:00 on Tuesday. We ask all participants to be at the train stop « Saint-Rémy-les-Chevreuse » at 12:30 the latest.

Accommodation for the overnight stay is provided at a cost of about 95€ per person (this must be paid by the participant). This is by no mean mandatory, but we highly encourage participants to take this option, as the social event on Tuesday evening will take place at the domain, and the hotel prices in the area are in a similar range.

Please indicate in your registration if you would like a room to be booked in your name.