Describe the debris flow in detail.
Answers
Debris flows are geological phenomena in which water-laden masses of soil and fragmented rock rush down mountainsides, funnel into stream channels, entrain objects in their paths, and form thick, muddy deposits on valley floors. They generally have bulk densities comparable to those of rock avalanchesand other types of landslides (roughly 2000 kilograms per cubic meter), but owing to widespread sediment liquefaction caused by high pore-fluid pressures, they can flow almost as fluidly as water.[2]Debris flows descending steep channels commonly attain speeds that surpass 10 m/s (36 km/h), although some large flows can reach speeds that are much greater. Debris flows with volumes ranging up to about 100,000 cubic meters occur frequently in mountainous regions worldwide. The largest prehistoric flows have had volumes exceeding 1 billion cubic meters (i.e., 1 cubic kilometer). As a result of their high sediment concentrations and mobility, debris flows can be very destructive.
Debris Flow
Explanation:
- Debris flow are produced when a mixture of clay and water acquires a density higher than water and transports large clasts of sand and even gravel.
- The large size grains are deposited when the transporting medium looses it's density and becomes increasingly fluid.
- The debris flow and turbidities are not necessarily composed of silicic materials only.
- Carbonate sediments also contribute to turbidities.
- Carbonate debris flow consists of clasts of varying sizes embedded in lime mud.
- Coral and algal fragments obviously of shallow water origin are sometimes transported to much deeper water by turbidity currents and deposited there.