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Landslides

Landslides. By: Jacob Campbell. What is a landslide?. A landslide is classified as a large mass of a material flowing down a decline, usually supplemented by water, other than snow (avalanches). Mud, rock, cement, and sand are examples of materials. . Causes.

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Landslides

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  1. Landslides By: Jacob Campbell

  2. What is a landslide? A landslide is classified as a large mass of a material flowing down a decline, usually supplemented by water, other than snow (avalanches). Mud, rock, cement, and sand are examples of materials.

  3. Causes Landslides can be triggered by intense rain or flooding, construction work, earthquakes, or volcanic eruption. These triggers are usually preceded by some environmental change, such as vegetation removal, snowmelt, and oceanic erosion.

  4. Effects Landslides cause both environmental and structural damage as well as many physical injuries or death to those caught in the devastating path of the landslide.

  5. Preparation for Landslides One can predict a landslide by looking for shifts in the ground covering, fissures and perceivable movement. To prevent landslides, runoff basins , dense vegetation, and maintenance are recommended.

  6. Engineering to Prevent To prevent landslides while grading for building, engineers place densely rooted plants on hills above a certain slope to hold the topsoil in place. They also dig runoff trenches to divert water away from slopes.

  7. Haiti After the Haitian earthquake, landslides devestated the cities, adding at least 500 casulties to the growing death toll. The lanslides were attributed to the combination of deforestation and the earthquake.

  8. Velocity and Momentum The velocity of an object is its speed and direction of motion. Its momentum is measured by multiplying the mass of the object by its velocity. This expressed as N/s, or Newtons per second

  9. The Math 30 tonnes = 30,000 kilograms 1Kg(1m/s)= 1N 30 m/s •30,000 kg= 900,000 N If a land mass of 30 metric tons traveling at a constant velocity 30 m/s (meters per second) downhill, it has 9o0,000 Newtons of force or 9o0,000 kilograms per meter per second.

  10. Interview My uncle, Prof. Jeffery Knott, from California State University, Fullerton, is an expert on landslides. He has written many articles and teaches geology. According to him, the city of La Jolla, as well as cities in similar places, does not have to warn people who buy coastal houses that there is a danger of landslides in the area. Here is a lecture Prof. Knott has done specifically on landslides: Lecture 06 - Mass Wasting.pdf

  11. Work Cited • "NASA - Locating Landslide Risks in Post-Quake Haiti.“NASA - Home. 18 Jan. 2010. Web. 08 Mar. 2011.<http://www.nasa.gov/topics/earth/haiti_eo- 1.html>. Shows information for Landslide risk after Haitian earthquake • “Landslide." Wikipedia, the Free Encyclopedia. 6 Mar. 2011. Web. 08 Mar. 2011. <http://en.wikipedia.org/wiki/Landslides>. General landslide information.

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