Contributor to erosion in glacial system
Regelation (dissolution of carbonates)
Plucking/quarrying on lee side of bumps
Freezing of water within cracks
Cracks (joints) present in rocks
Rock composition & strength
Sediments vs bedrock at bed
Bed permeability
Roughness of bed
Slope of bed
Presence of water at base, allowing sliding
Topography of bed focuses stresses
Length of time ice is there
Discharge rates
Subglacial water speed
Amount of sediment within basal ice
With
Warmbased?
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
With
Coldbased?
Hydrology
Bed
effects
effects
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x