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Debris flows are fast-moving landslides that can be triggered by rainfall, snowmelt, or wildfires. They can cause severe damage and loss of life in various environments, especially in the U.S. Learn more about debris flows, how to forecast them, and how to protect yourself from them.
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Woody material deposited by a debris-flow near the area...
- Landslide Preparedness
Landslide and debris flow warning signs, what to do before,...
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The speed and volume of debris flows make them very dangerous. Every year, worldwide, many people are killed by debris flows. This hazard can be reduced by identifying areas that can potentially produce debris flows, educating people who live in those areas and govern them, limiting development in debris flow hazard areas, and developing a debris f...
Debris flows differ from slides because they are made up of \"loose\" particles that move independently within the flow. A slide is a coherent block of material that \"slides\" over a failure surface.
A mud flow is composed of mud and water. Debris flows have larger particles - at least 50% of a debris flow is made up of sand-size or larger particles.
Addition of Moisture: A sudden flow of water from heavy rain, or rapid snowmelt, can be channeled over a steep valley filled with debris that is loose enough to be mobilized. The water soaks down into the debris, lubricates the material, adds weight, and triggers a flow.
Removal of Support: Streams often erode materials along their banks. This erosion can cut into thick deposits of saturated materials stacked high up the valley walls. This erosion removes support from the base of the slope and can trigger a sudden flow of debris. Wildfires or Timbering: Some debris flows occur after wildfires have burned the vegeta...
A debris flow is a fast-moving mass of loose mud, sand, soil, rock, water and air that travels down a slope under gravity. Learn about the conditions, triggers, and dangers of debris flows, and see videos, pictures, and maps of past events.
Mar 21, 2024 · A landslide occurs when masses of rock, mud or debris move down a slope. When a wildfire burns a slope, it increases the chance of landslides for several years. How to protect yourself or your property depends on the type of landslide.
Debris flows include <50% fines. Debris flows are commonly caused by intense surface-water flow, due to heavy precipitation or rapid snowmelt, that erodes and mobilizes loose soil or rock on steep slopes. Debris flows also commonly mobilize from other types of landslides that occur on steep slopes, are nearly saturated, and consist of a large ...
Flows are commonly separated into debris flow (coarse material) and earthflow (fine material) depending on the type of material involved and the amount of water. Some of the largest and fastest flows on land are called sturzstroms , or long-runout landslides.
