Sand extrusion dynamics —

This video shows sediment being fluidised due to basal overpressure. Water is pumped through a bed comprising two particle diameters (36 micron and 689 micron in 2:3 ratio; 20% of coarse particles dyed blue to aid visualisation). This models processes forming a sediment extrudite (e.g. sand volcanoes, blows or boils).

https://downloads.sms.cam.ac.uk/2531893/2531900.mp4