Geology GEOL-G 107 Lecture Notes - Lecture 18: Water Content, Dissolved Load, Dam Failure
Document Summary
Landslides are natural forming from erosion, increase in water rainfall, and water when into ground and caused mountain to slide into civilization. Note: landslide in oso washington: liquefied soil moved down the hill, and shot with large amounts of soil, mud, etc. Note: high slope angles result in more mass movement. Ex: grad= (rise /run)*100 slope = (. 25/2. 5)*100 = 10% Concave slope lower part of the slope. Fs= rf/df resisting force / driving force rf <<< df unstable if both equal one then fine . Geology of area: colluvium over low permeability bedrock. Vegetation: plant roots provide stability anchor the earth. Slope (topography): steeper the slope, the greater the driving force. Water content: must have water to have earth movement. Less grain to grain contact and less cohesion attraction between grains. Lubricating action of water less friction greater mobility. Rock fall: free or nearly free fall of earth material.