Workshop Utrecht 2014

Workshop on hyper-resolution global hydrological modelling: the next step

held on February 13-14 2014 in Utrecht, the Netherlands
Marc Bierkens (Utrecht University), Eric Wood (Princeton University), Nathanial Chaney (Princeton University)
Sponsored by
The main objective of this workshop was to bring together groups involved in large-scale hyper-resolution hydrological modelling in order to:
  1. exchange experiences thus far and learn from each other’s problems, failures, successes and solutions;
  2. investigate possible community building: discuss in what form groups involved in large-scale hyper-resolution hydrological modelling could work together in the future. Would it be a community of models doing comparison experiments, a community striving for one community model, or one that builds model components that can be exchanged between models (e.g. in a Python framework)?;
  3. set up a joint research program where problems/issues will be identified that concern most groups and assign a limited number of groups working on these problems together and making the results available to the community.

Meeting Program

Day 1: Thursday 13 February

9:30-10:00     Arrival, coffee and welcome
10:00-10:30   Eric Wood: Vision for establishing a collaborative network on hyper resolution global land surface modeling, and goals for the workshop - What would the network look like? -  What type of issues would we work on? -  What do we want to achieve this year? -  What do we want to achieve in the following years.
10:30-12:30    Presentations (15 minutes including focused discussion) by groups: progress, challenges, failures, unresolved issues: groups are requested to distribute the most important sheets  with m 3-4 pages, prior to the workshop.)
12:30-13:45    Lunch
13:45-16:00    Presentation by groups (continued)
16:00-17:30    General discussion of the activities by the groups: identification of areas of progress and main challenges by category; areas of collaboration. To guide the discussion we already propose the following categories: 1) computational issues; 2) parameterization and scale issues;
17:30              Drinks at the Basket (on Campus)
19:30              Dinner at Restaurant Goesting (in Town)

Day 2: Friday 14 February

9:00-9:15       Arrival and  coffee
9:15-10:00     Introduction by Nathanial Chaney: Computation Challenges: Modularization and Parallelization
10:00-10:15    Niels Drost (eScienceCenter): short presentation on AMUSE – Python framework now used to couple multiphysics modules (examples from astrophysics)
10:15-12:00    Discussion of main challenges by category: possible solutions/collaboration and subsequent actions.  Identification of groups willing to work on these (commitments). Three break-out groups: 1) computational issues; 2) parameterization and scale issues; 3) setting up a the collaborative network.
12:00-13:30    Lunch
13:30-15:00    Writing up results of morning’s discussion (challenges and action items) by category, and proposing structure of the research network/collaboration, modes of communication (website/wiki; AGU/EGU sessions) and development of a white paper (Contribution to EOS Transactions AGU). Timelines for action items (coming years, years to follow).
15:00-15:30  Wrap up and closure

Detailed list of short talks

Speaker 1 Speaker 2 Model/project university / organisation presentation time
Nathanial Chaney Eric Wood VIC: Talk Princeton University 10:30-10:45
John T, Reager Cédric David RAPID & CLM: Talk University of California Center for Hydrologic Modeling 10:45-11:00
Vicky Bell Grid-to-Grid (G2G) model: Talk Centre for Ecology and Hydrology, Wallingford 11:00-11:15
Edwin Sutanudjaja Marc Bierkens PCR-GLOBWB 2.0 /eWaterCycle: Talk dept. Physical Geography: Utrecht University 11:15-11:30
Rolf Hut Nick van de Giesen eWaterCycle: Talk TU Delft – CITG 11:30-11:45
Hessel Winsemius GLOFRIS: Talk Deltares – Delft 11:45-12:00
Ed Sudicky Hydrogeosphere: Talk University of Waterloo 12:00-12:15
Peter Burek Ad de Roo Lisflood JRC Ispra 14:00-14:15
Laura Condon Reed Maxwell CONUS Parflow: talk Parflow: Colorado School of Mines 14:15-14:30
Stephan Kollet Parflow University of Bonn 14:30-14:45
Luis Samaniego mHM: Talk UFZ Helmholtz Centre for Environmental Research 14:45-15:00
Paul Houser Hyper-resolution forcing: Talk George Mason University 15:00-15:15
Martina Flörke WaterGap: Talk WaterGap: University of Kassel 15:15-15:30
Petra Döll WaterGap: Talk University of Frankfurt 15:30-15:45
Dave Gochis NCAR HR regional modeling: Talk NCAR 15:45-16:00

List of Participants

1 Vicky Bell CEH, Wallingford
2 Marc Bierkens PCR-GLOBWB: Utrecht University
3 Peter Burek Lisflood: JRC
4 Nathaniel Chaney VIC: Princeton University
5 Laura Condon Parflow: Colorado School of Mines
6 Cédric David RAPID: University of California Center for Hydrologic Modeling
7 Ad de Roo Lisflood: JRC
8 Petra Döll University of Frankfurt
9 Niels Drost eScienceCenter Amsterdam
10 Martina Flörke WaterGap: University of Kassel
11 Dave Gochis NCAR HR regional modeling
12 Paul Houser George Mason University
13 Rolf Hut TU Delft – CITG
14 Stephan Kollet University of Bonn
15 Reed Maxwell Parflow: Colorado School of Mines
16 John T. Reager CLM:University of California Center for Hydrologic Modeling
17 Luis Samaniego UFZ Helmholtz Centre for Environmental Research
18 Ed Sudicky Hydrogeopshere: University of Waterloo
19 Edwin Sutanudjaja dept. Physical Geography: Utrecht University
20 Nick van der Giessen TU Delft
21 Hessel Winsemius Deltares – Delft
22 Eric Wood VIC: Princeton University
 Main outcomes workshop
  1. Creating an open network: Water innovation partnership on hyper-resolution modelling
    With the main objective: to strive for being able simulate terrestrial hydrology and water resources at hyper-resolution at acceptable accuracy.
    -   Society: To be locally relevant for water resources management where needed.
    -   Equity: Equity of information about the globe.
    -   Science: By attempting this we will be able to learn at what scales which processes matter and how to transform information from one scale to another

This poses the question: is it possible to be locally relevant with globally available information?
This generates a number of scienctic questions (See also Wood et al., 2012)

  • Questions of scale: can we seamlessly up- and downscale our models and get consistent water balance and energy balance components?
  • Can we extract the information needed, in particular human impacts, to be able to reach sufficient accuracy at the local scale?
  • …..

2. The establishment of three working groups:

  • WG1: Setting up a testbed for comparing different large-scale models at different resolutions.
    • Global at 5 minutes (long-term goals: global at 1 km)
    • Domains: CONUS, CORDEX Europe at 1 km
    • Rhine + Illinois + California at 100 m
    • Common datasets: provided at the finest scale possible at fixed format.
    • Run the various models at decreasing resolution
    • Run it with local and globally available information
    • Include LIS scaling tools
  • WG2: Around computational challenges, including parallel computing and model component coupling.
    • Common platform to perform comparisons and analyze results: you submit your data and it automatically generate the comparison statistics
    • Common framework for coupling modules: common i/o system (AMUSE, CSDMS).
    • Commont tools for solving computational issues (parallelization)
  • WG3: With the goal to think about delivering the information needed to achieve hyper-resolution (< 1 km) globally:
    • Compile high-resolution global datasets using auxiliary information
    • Devise new model concepts that are replace subgrid-parameterizations with computationally frugal spatially explicit physics
    • Create hyper-resolution global forcing data.

3. Organize regular meetings (EGU and AGU).

4. Writing of an opinion paper.