NTR: frost heaving

[stevenchong]

Another term for the ECSO project.

definition: Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary).
source: https://en.wikipedia.org/wiki/Frost_heaving

Note, I'll be handling this. Comments are welcome.

[pbuttigieg]

Good stuff.

Check out frost-formed hummock and palsa, which could both be an output of a frost heaving process.

I think frost heaving process would go somewhere under material transport process...

[cmungall]

If there is no preference on names amongst the expert community, my preference would be "frost heave" for the material entity (heaving sounds like a process)

…

On Mon, Mar 4, 2019 at 2:58 PM Steven Chong ***@***.***> wrote: Another term for the ECSO project. definition: Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary). source: https://en.wikipedia.org/wiki/Frost_heaving Note, I'll be handling this. Comments are welcome. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#703>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AADGOQCVZbEheaccnLShzSlnRWgi877iks5vTXrNgaJpZM4bdF-0> .

[pbuttigieg]

@cmungall

If there is no preference on names amongst the expert community, my
preference would be "frost heave" for the material entity (heaving sounds
like a process)

Good point, we'll create the ME alongside the process.

[rduerr]

@pbuttigieg @cmungall Sorry I am ignoring this all until the proposal due tomorrow is in. But I do note that all of the cryo related terms I've seen run by over the last few days are in the GCW glossary, so please let me weigh in later this week!!!

[pbuttigieg]

@rduerr absolutely! we're just adding some NCEAS terms with definitions we happen upon. We'd be thrilled to use the GCW defs as authoritative to enhance these. Looking forward to your input!

[rduerr]

Sorry to be soo... slow getting to this:

Frost heave is the term GCW uses for the material entity; while frost heaving is the process. The GCW definition for frost heaving is:

The process of upward or outward movement of the ground surface (or objects on, or in, the ground) caused by the formation of ice in the soil.

Note the "outward" part of that definition which is currently missing from the current definition.

The GCW definition for a frost heave is:

An area of ground surface that has moved upward or outward due to the formation of ice in the soil.

There is also a lot of explanatory text that goes with these:

Frost action in fine-grained soils increases the volume of the soil not only by freezing of in situ pore water (9% expansion) but also by drawing water to the freezing front where Ice lenses form. Soils that have undergone substantial heaving may consist of alternate layers of ice-saturated soil and relatively clear ice lenses. The lenses are formed normal to the direction of heat flow and when freezing penetrates from the ground surface (which may be horizontal, sloping or vertical), they form parallel to that surface. When unrestrained, the amount of surface heave may be almost as much as the total thickness of the ice lenses. Frost heaving can occur seasonally or continuously if freezing of the ground proceeds without interruption over a period of years. Differential, or non-uniform, frost heaving is one of the main aspects of the frost action process and reflects the heterogeneous nature of most soils, or variations in heat removal rate and groundwater supply over short distances. Depending on the degree of restraint, large freezing pressures (up to 1 MPa) can be developed as the ground freezes.

I don't know how you want to handle this - so am just leaving it here as a comment.