erosionalprocesses

erosionalprocesses - V. Erosional Processes PowerPoint-Soil...

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V. Erosional Processes PowerPoint--Soil Erosion Definition-- PowerPoint--Erosion Definitions-- PowerPoint--Definitions continued-- Soil erosion is the process of detachment and transportation of soil materials by erosive agents. Since one of the objectives of watershed management was to control or reduce accelerated erosion we shall now briefly consider the erosional process so that we may better understand what it is we are attempting to work with. There are two main categories of erosion: o Geological or natural o Man-induced Geologic erosion is a natural dynamic process resulting from the uplift of land masses and their subsequent reduction to base level. Man-induced erosion or accelerated erosion is that portion which exceeds the natural erosion phenomena.
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In our definition of erosion, we spoke of erosive agents and we shall study erosional processes from that standpoint. These agents are namely wind and water. PowerPoint--Forms of Water Erosion-- A. Water-- Forms of water erosion: 1. Sheet erosion- very common; extremely damaging; uniform removal of surface; often goes unnoticed at first. 2. Internal erosion- downward movement into the profile; plugs pores and lowers infiltration rates. Puddling- usually caused by rainfall action. 3. Channel erosion- o Rill- small channels which concentrate water. o Gully- deep into the subsoil. o Stream- from sides and bed of natural stream channel. 4. Mass movement-caused by lubricating action of water and pull of gravity. Erosion Classification for Watersheds (H.G. Wilm) Streams----
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Class O: Stream shows no signs of erosion or excessive discharges. Banks well vegetated, often overgrown with woody
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erosionalprocesses - V. Erosional Processes PowerPoint-Soil...

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