DEFINITION OF SEDIMENT FLOWS

When mixtures of rock debris, water, and air begin to move

under the force of gravity, they are said to flow. This is a type

of deformation that is continuous and irreversible. The way

in which this mixture flows depends on the relative amounts

of solid, liquid, and air, the grain size distribution of the solid

fraction, and the physical and chemical properties of the sediment.

Mass wasting processes that involve flow are transitional

within themselves, and to stream-type flows in the

amounts of sediment/water and in velocity. There are many

names for the different types of sediment flows, including

slurry flows, mudflows, debris flows, debris avalanches,

earthflows, and loess flows. Many mass movements begin as

one type of flow and evolve into another during the course of

the mass wasting event. For instance, it is common for flows

to begin as rock falls or debris avalanches and evolve into

debris flows or mudflows along its length as the flow picks

up water and debris and flows over differing slopes.

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