GPHY 102 Lecture Notes - Lecture 17: Walkover, Landform, Management System
15 Oct 2014
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Erosion by overland flow (cid:149) known as slope erosion (cid:149) begins with impact of precipitation on surface, which lifts and moves soil particles known as splash erosion. Fluvial action starts with overland flow, which consists of a thin film of water or tiny rivulets that move across the ground. Excess rain and melting snow can also reach the ground, either as throughfall that drips from the vegetation or as stemflow that trickles along branches and down stems and trunks. Erosion by overland flow (cid:149) eventually reaches bottom of slope, water slows and particles settle out; deposited material known as colluvium. (cid:149) If reaches stream, and eventually settles out, then known as alluvium. Canada (cid:149) linked directly to climate (and permeability of substrates). (cid:149) runoff is highest in the coastal areas of bc, the atlantic provinces and in the western mountains. (cid:149) lowest in the prairie provinces. Estimates of sediment yield - revised universal soil loss.
