GEOG 1350 Midterm: midterm 2 review
3 Mar 2017
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Document Summary
Falls- mass detached from steep slope along surface with little or no shear displacement, descends mostly through the air by free fall bouncing or rolling. Rotational slides- sliding outwards and downwards on one or more concave upward failure surface. Gain size- as grain size increase angle of repose increases. Amount of moisture- increasing moisture = increasing angle of repose until it reaches saturation. If to much water is added and becomes saturated the water pushes the grains apart. Types of downslope movement factors: material, cohesion, climate, slope, concave or convex. Translational (planar) slides- sliding on a planar failure surface running more or less parallel to the slope. Key to all slides: (unless it is rock slide) usually unconsolidated. Moisture content usually intermediate involved in trigger. Rock falls: consolidated, have slide, fast, wet. Rotational slides: sliding outwards and downwards on one or more concave upwards failure suface. Translational (plantar) slides: sliding on plantar failure surface running parallel to slope: debris flow.
