DA EOSC 114 Learning Goals Landslides

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Earth and Ocean Sciences
EOSC 114
Leah May Ver

Ch.4 Learning Goals 1. Explain how the Landslides occur when the gravitational force pulling the slop material socioeconomic down exceeds the slop material’s internal resistance to shear or failure. impact of landslides depends on the type Landslides can be more devastating to areas with a high population density, and characteristics low levels of preparedness, and poorly made infrastructure. This is most of the landslide frequently found in third world countries. hazard The reason why it is more devastating is because the weak infrastructure collapses more easily in the face of landslides, causing more damage and the high population density makes evacuation efforts more difficult and there are more people to be injured. The economic impact is usually more severe in developed countries because of the high cost of building new well-made infrastructure 2. Distinguish Fall: occur on very steep slopes and material (usually rock) detaches from between the these slopes due to weakness. They are very fast and are propelled by different modes of gravity. failure (falls, flows, slides, topples, and Topple: forward rotation of material (rocks) about a pivot point below the spreads) and how center of gravity of the unit or in the slope. There is no debris topple they are influenced because debris is unsorted with varied sizes while topples consist of by geology coherent blocks Slides: move as a coherent mass along a surface of failure, and are usually composed of soil, rock, or debris. If the surface is curved, the slide is rotational, moving at an intermediate speed with weak material. If it is a translational slide, it can be slow to fast moving, made of strong material moving on planes of weakness. Flows can range in speed from very slow to very fast. They are composed of wet amerial such as soil and mud. Water is very important to flows. There can be a fluid or plastic flow of material. Soil creep is an example of flow, although it is very slow. Type of Type of Material movement Bedrock Debris (Unsorted soil) Earth (Sorted soil) Falls Rock Fall Debris Fall Earth Fall Topples Rock block -- Earth block topple topple Flexural topple Slides Rock slump Debris slide Earth slump Rock slide Earth slide Spreads Rock spread -- Earth spread Flows Rock creep Debris flow Sand flow slide Slope sagging Mud flow Silt flow slide Debris avalanche Earth flow slide Soil creep Dry sand flow Solifuction Earth flow 3. Define the chief components of landslide risk 4 compare and Slope failure occurs when the force of gravity parallel to the slope (shear contrast landslide stress) become greater than the strength of the material that make up the causes and how they slope, which is acting to hold itself in place (shear strength) differ from landslide triggers Landslide causes are long-term factors leading to the instability of a given slope, and they reduce the shear strength of a slope. However, they do not initiate any movement. A trigger is a factor that translates instability into motion. They are usually short event and only one is required to start a mass movement. 5. Asses the balance The factor of safety (Fs) is the ratio of shear strength to shear stress. If between the Fs>1, the slope is stable. If it is <1, failure occurs. strength of the slope Shear strength is the resisting force, made up of friction and cohesion. an
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