EOSC Landslides and Volcanoes - M,EOSC Landslides and...

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M,EOSC Landslides and Volcanoes 1. Explain how the impact of landslides depends on: a) Population density: Population density affects the impact of landslides because the more concentrated the population the higher the risk is of a larger death toll if a landslide occurs in that area. b) Economic infrastructure: The largest impact of landslides is their toll on the economy, the more economic infrastructure there is in a landslide prone area the higher the economic toll will be as more infrastructure will be affected by the landslide. c) Population Preparedness : The impact of landslides can be greatly reduced if the population is prepared because if evacuation is necessary it can be carried out and personal belonging can also be saved, accordingly population preparedness can also reduce the effect of landslides by the use of mitigation tools such as water drains or protection walls to reduce the effects of the landslide. 2. Explain why British Columbia has the highest frequency off landslides in Canada and what we should expect as our population expands into the mountains It has the highest frequency of landslides because of its mountainous terrain, the fact that it has lots of rain and due to its complex geology such as unconsolidated glacial sediments. British Columbia also has many triggers. The return period of Large Landslides is 25-70 years; they are over 20 million m3 of material. As our population expands into the mountains we can expect more landslides to occur because mountain sides will logged making the slopes unstable and also allowing the ground to absorb more rainwater 3. Distinguish between the 3 main failure modes (falls, flows, and slides) and how they are influenced by geology Falls: Occur on very steep slopes, usually rock. The material detaches because of weakness and it falls very fast due to gravity. Slides: Can vary from slow to fast they are usually soil rock or debris. In slides the material moves as a coherent mass along a surface of failure which can be either curved or strait. If the surface is curved the slide is rotational which means it will have intermediate speed, usually have weak material like sidement and this material rotates on a curved failure plane so this slide is often characterized by a curved scarp above the slide. Slides can also be translational if the surface is flat. Translational slides can vary from slow and fast and they are usually strong material moving on planes of weakness and is cohesive motion of material along a flat surface. Flows: Very flow to very fast, mudlows up to 80kmh, the materials involved are soil, mud and wet debris which is usually rock. In Flows water is usually very important because flows have a fluid or plastic flow of material that is chaotic. 4. Categorize, Identify, and Name a variety of different landslides
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This note was uploaded on 03/06/2012 for the course BIOLOGY 121 taught by Professor Hawk during the Spring '12 term at The University of British Columbia.

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EOSC Landslides and Volcanoes - M,EOSC Landslides and...

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