OSO mudslide washington
- Created by: MillieLynch
- Created on: 29-06-16 18:22
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- Oso mudslide, Washington State, USA March 2014
- Why?
- Human
- Urbanisation
- Highway 530 constructed beneath cliff
- Physical
- Elevated terrain (600ft)
- made of silt and clay, which when wet are slippery
- Top layer porous, so water seeps in and soaks the ground
- Prolonged heavy rain- increased ground water pressure
- Wettest March in history: 2ft rain in a month
- Traveled at 40mph
- Human
- When?
- 10:37 am PDT on Saturday, March 22, 2014
- Where?
- Northwest Washington------> Oso
- Took place along the edge of a plateau about 600 feet high composed of glacial sediments
- What?
- Landslide with a volume of the slide is estimated to be about 10 million cubic yards
- Traveled about 0.7 miles from the toe of the slope.
- Flow also dammed and temporarily blocked the upper part of the North Fork Stillaguamish River
- Impacts
- Economic
- Blocked highway 530
- Emergency services came to 4.5 million pounds
- Total cost=10 million
- Buried mile stretch of highway, taking 6 months to rebuild
- Social
- 49 homes picked up and destroyed
- Debri from houses
- Children Orphanised
- People submerged in mud
- Environmental
- Trees pulled up from roots
- Dammed the river
- 1 square mile of valley buried under 50 km of mud
- Flooding from the pool of water formed from the dam, blocking the 2.5 square mile stillaguamish
- (Short Term)
- (Long Term)
- Management strategies
- Short-term (emergency and rescue)
- Trained air rescuers
- Helicopter rescue team first on the scene to scan for survivors (thermal camera)
- Long-term (Planning and Management)
- LIDAR (lasers) can penetrate though the canopy, ad collect info about past landslides
- take a laser in plane and shine it down on topography and measure the time it takes to get back to the instrument
- Initial surveying from a distance
- Carbon rock dating
- Aerial and satellite images
- Experiments on water retainment
- USGS installed three rapid Deployment Gages
- Measure additional water levels and streamflow
- Monitor rate of erosion of dam
- Downstream
- USGS got three "spiders" (powerful GPS units) to detect landslide movement with vibrations.
- LIDAR (lasers) can penetrate though the canopy, ad collect info about past landslides
- Short-term (emergency and rescue)
- Economic
- Why?
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