Landslide Phomena

ls535's version from 2017-05-22 13:44

Section 1

Question Answer
Landslide (4) dry flowRelatively rapid forms of mass wasting, maintaining contact with the slope as it moves down
Creep (2) dry flowExtremely slow down-slope movement. Only affects upper few meters. Enhanced by frost heaving, wetting and drying cycles, washing away of fine particles
Debris avalanches (5) dry flowResults in collapse of a slope. Very rapid, turbulent mass of debris, rock and water
Mudflow (3) slurryQuick flowing mixture of debris and water, usually moving down a channel. Occurs in sparse vegetation after heavy rainfall, is a slurry of water and fine-sediment
Solifluction (1) slurryIn cold climates, where short summers thaw the top of the soil and below is permently frozen permafrost which doesn't drain. waterlogged soil flows very slowly downhill

Section 2

Question Answer
Varnes 1978All slope movements involving significant internal distortion of a moving mass are classed as flows
Landslideup to 161 km per hour
Mudflow88km, can pick up cars and houses
Creep1cm per year
Debris avalanche480km per hour, can travel relatively far along gentle slopes
Solifluction0.5-15cm per year
Migon 2016Solifluction is a category of shallow mass movement, affecting saturated unconsolidated deposits and results from reduction of internal fricition