Finite Element Simulation of Frost Wedging in Ice Shelves

• Published in: PAMM
• Main Authors: Plate, Carolin, Müller, Ralf, Humbert, Angelika, Gross, Dietmar
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Wiley 2014
• Subjects: Ice Shelf; Ice Shelves
• Online Access: https://epic.awi.de/id/eprint/45861/; https://epic.awi.de/id/eprint/45861/1/Plate_et_al-2014-PAMM.pdf; https://hdl.handle.net/10013/epic.51954; https://hdl.handle.net/10013/epic.51954.d001

Break-up events in ice shelves have been studied extensively during the last years. One popular assumption links disintegration events to surface melting of the ice shelf in conjunction with growing melt-water ponds, leading to hydro-fracture. As this explanation only holds during warm seasons [1], the possibility of frost wedging as forcing mechanism for autumn and winter break-up events is considered. Frost wedging can only occur if a closed ice lid seals the water inside the crack. Hence, the present study of frost wedging in a single crack uses ice lid thicknesses to evaluate the additional pressure on the crack faces. The investigation of the resulting stress intensity factor as a measure of crack criticality follows consequently. The results show that freezing water inside a crack can result in unstable crack growth of an initially stable water filled crack.