Oversteepening mass wasting pdf

Pdf masswasting is a unique geomorphological process destabilizing the surface rocks and soil. An oversteepened slope may also trigger landslides. It is a slow movement of soil and regolish downhill. As terrain becomes more mountainous, the hazard increases in developed nations impacts of masswasting or landslides can result in millions of dollars of damage with some deaths in less developed nations damage is more extensive because of population density, lack of stringent zoning laws, scarcity of.

When a slope becomes steeper than the angle of repose. Mass wasting is the downhill movement of rock and soil material due to gravity. Masswasting is a unique geomorphological process destabilizing the surface rocks and soil mass. Internal cohesion strength the characteristic property of a. The steepest angle at which particles can remain stable along a slope is known as the angle of repose. Slope failure, also referred to as mass wasting, is the downslope movement of rock debris and soil in response to gravitational stresses. Lecture notes 11 mass wasting glendale community college. Information on these locations, dimensions, and key characteristics of the features are presented in table 4, and shown in photographs in fig. Usually happens when water seeps into soil particles, freezes in between and causes them to expand and then move downward when the ice melts. Research in southeast alaska has identified soil mass movement as the dominant erosion. Increased water content within the slope is the most common masswasting. The types of movement, falls, slides, and flows, will be covered in this module. Definition the bulk movement of weathered and broken rock.

Soil, debris, sediment, and broken rock is called regolith. Gravity the force of gravity provides the energy that causes material to move downhill. Mass movements and mass movement processes tulane university. The features are shown in a map view and a crosssection view in fig. Mass wastingmass wasting western oregon university. Periodically high soil moisture content and oversteepened slopes. Mass movement processes are occurring continuously on all slopes. Schwert, ndsu triggers for rapid mass wasting rain oversteepening cutting at foot of slope piling on head of slope deforesting devegetating earthquakes learning objectives understand basic slope processes and the causes of slope failure understand the role of driving and resisting forces on slopes and how. Mass movement causes regolith and rock to move downslope where sooner.

Click to view the presentation in html online lecture pt. Wasting is the movement of rock and soil down a slope due to the force of. Three major types of mass wasting are classified by the type of downslope movement. Mass wasting mass wasting is the movement of rock and soil down a slope due to the force of gravity. The work of gravity mass wasting is the downslope movement of rock and soil due to gravity controls and triggers of mass wasting water reduces the internal resistance of materials and adds weight to a slope oversteepening of slopes list factors that will affect how easily 5 mass wasting occurs. It could be rapid snowmelt, intense rainfall, earthquake shaking, volcanic eruption, storm waves, rapidstream erosion, or human activities, such as grading a new road.

If a slope becomes too sleep, mass wasting will occur. Gravity pulls rocks, soils and debris on a downward slope naturally without any chemical change. Click to view or download the presentation in pdf 34 mbytes. Oversteepened slopes could be graded to reduce the slope to the. As terrain becomes more mountainous, the hazard increases in developed nations impacts of mass wasting or landslides can result in millions of dollars of damage with some deaths in less developed nations damage is more extensive because of population density, lack of stringent zoning laws, scarcity of. Slope movement types and processes transportation research. Mass movement is defined as the down slope movement of rock and regolith near the earths.