Physical Processes
Rill Erosion
Geomorphology
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Rill erosion is the removal of a thin layer of soil by small, well-defined channels a few centimetres deep, cut by concentrated overland flow once sheet flow becomes channelized on a bare or sparsely vegetated slope. Rills are shallow enough to be erased by normal tillage, distinguishing them from permanent gullies, but repeated rilling strips topsoil fast enough to be a leading cause of agricultural land degradation worldwide.
Facts
Process Type TimescaleMinutes to hours during a single rainfall event; cumulative topsoil loss becomes measurable over growing seasons. 1 Sources
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