BAS/CPOM meeting on ice fracture  

Organisers: Rosie Williams, Robert Arthern & Romy Hall

Ultimate goal: pathways to representing mathematics and physics of fracture in ice sheet models. 

The aims of the workshop are  

1. To promote the exchange of ideas with a view to allowing the mathematical and physical representation of fracture to be included efficiently in large-scale ice sheet models of the kind used to make sea level projections. 

2. To identify the central challenges that still need to be overcome in modelling the fracture of ice. 

3. To build a collaborative and supportive community in the field of fracture that includes theoreticians, numerical modellers, observationalists, remote sensing experts, machine learning experts, fieldwork and laboratory specialists. 

Attendees:  

Start: 12:00/12:30, Wednesday 9^th July 

End: 12:30-13:30pm, Friday 11^th July 

All talks and discussions will be in the Conference Room. Tea/coffee and lunches will be served just outside the room. 

Schedule 

For the whole-group discussion sessions, these will be very open and informal. Everyone is welcome to present a few slides of what they’re working on or thinking about (thanks to those that have already offered); conference-like, polished presentations are not required. 

Wednesday 9^th July 

12:30-13:30	Arrival and lunch
13:30-13:50	Welcome & goals of workshop
Which equations can we use to represent fracture?
13:50-14:15	Keynote: Ravindra Duddu  Damage and phase field modeling of glacier and ice shelf flow and fracture
14:15-15:30	Discussion (Daniel & Rabea to lead)  Audience prep.  Modellers: be prepared to show one or two slides of recent simulations or theoretical work. Obs & Lab: Can you measure the parameters used in existing models? Do your results question current approaches? Where are the dragons? What is still mysterious about fracture?
15:30-16:00	Tea break
16:00-17:00	Small group discussions (general & mixed)  Ideally a few groups, each containing a mixture of disciplines.  Conversations: What is new in your field? What is holding back your research? What do ECRs need from the community?

Thursday 10^th July 

9:00	Arrival at BAS
How can we include fracture in large-scale numerical ice sheet models?
9:05-9:30	Keynote: Sainan Sun Fracture & damage applied to ice sheet modelling
9:30-10:30	Discussion (Rob Arthern & Tom Mitcham)  Audience prep. Which processes are we trying to model on regional scales and how are we doing? Marine Ice Cliff Instability Ice shelf collapse Rifting and tabular calving Small scale calving Crevassing and shear margins Others?  What are the viable routes to large-scale simulations involving fracture? Asymptotic approximation Exascale HPC/GPU Emulation by Machine Learning Others?  Which approaches will scale to continental models? Phase field Discrete Element Damage Linear Elastic Fracture Mechanics Rate-based calving via level-set Others?  How can we initialise fracture models? Can we characterise existing flaws in large domains?
10:30-11:00	Coffee break
11:00-12:30	Group discussions (thematic groupings) Maths/Physics of fracture Numerics / Machine Learning Observations / Laboratory Hydrology / Hydrofracture  Conversations: The nitty gritty details What is the priority for each discipline? ECR input on these topics.
12:30-13:30	Lunch
How can observations from satellites, fieldwork and laboratories be used to constrain models of fracture?
13:30-14:00	Keynote: Trystan Surawy Stepney Combining observations and models of fracture
14:00-15:00	Discussion (Emma Pearce and Glenn Jones)  Audience prep.  Laboratory / field observations: be prepared to show one or two slides of recent experiments. Remote sensing/machine learning: what is the current state of the art from remote observations? Modellers: Are there parameters you need that are not being measured?
15:00-17:00	Coffee and break out time/free time Time for project meetings/sightseeing Spin up your own proposal team.

Friday 11^th July 

9:00	Arrival at BAS
What are the options and issues for modelling and observing hydrology and hydrofracture?
9:05-9:30	Keynote: Brad Lipovsky Representation of fracture and hydrofracture in ice sheet models
09:30-10:30	Discussion (Sammie Buzzard & Alison Banwell  to lead)  Audience prep. What are the key concerns with getting hydrofracture right in models?  How can we improve the causal chain: Climate -> Melt -> Hydrology & Transport -> Lakes/Crevasses -> Hydrofracture?  Do we need specific field activity on hydrofracture? What would it look like?  Are there new approaches from remote sensing and/or machine learning to monitor hydrology?  Hero or villain? The roles of firn aquifers, lakes, percolation and refreeze, runoff.
10:30-11:00	Coffee break
11:00-12:30	Wrap-up: Next steps – define if we’re writing something, what it might be, who is responsible? What are the viable funding calls for collaborative work? General deterioration.
12:30-13:30	Lunch & Departure