ENVS 3080 Study Guide - Final Guide: Wind Shear, Erodability, Viscosity
2 Oct 2015
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Splash raindrops, creates small craters where drops hit small bombs . Interill runoff going between rills (also called sheet erosion) Splash + interill = 70% of erosion. Can cause large erosion with high volumes of rainfall. Eventually removes entire soil profile if left unchecked. * 2 types: shallow, easily corrected via tillage, ephemeral (usually reform in same place year after year) * permanent too large to be smoothed by regular tillage. * shear stress less than critical shear of soil = no gully. * shear stress greater than critical shear of soil = gully. Intrinsic capacity of rainfall to cause soil erosion. Increased rainfall = increased erosion: function of duration + intensity. Intensity amount of rain over time (e. g. mm/hr: usually < 70 mm/hr up to 150 mm/hr in some cases, directly correlated to erosion, higher intensity = greater erosion.
