Stream Types Created By Headward Erosion
Three kinds of streams are formed by headward erosion: insequent streams, subsequent streams, and obsequent and resequent streams (See Fluvial landforms of streams.) Insequent streams form by random headward erosion, usually from sheetflow of water over the landform surface. The water collects in channels where the velocity and erosional power increase, cutting into and extending the heads of gullies. Subsequent streams form by selective headward erosion by cutting away at less resistive rocks in the terrain. Obsequent and resequent streams form after time in an area of insequent or subsequent streams. Obsequent streams are insequent streams that now flow in an opposite direction of the original drainage pattern. Resequent streams are subsequent streams that have also changed direction from their original drainage patterns. (Easterbrook, p. 149)
Read more about this topic: Headward Erosion
Famous quotes containing the words stream, types, created and/or erosion:
“Married love is a stream that, after a certain length of time, sinks into the earth and flows underground. Something is there, but one does not know what. Only the vegetation shows that there is still water.”
—Gerald Branan (1894–1987)
“He types his laboured column—weary drudge!
Senile fudge and solemn:
Spare, editor, to condemn
These dry leaves of his autumn.”
—Robertson Davies (b. 1913)
“We live in a time which has created the art of the absurd. It is our art. It contains happenings, Pop art, camp, a theater of the absurd.... Do we have the art because the absurd is the patina of waste...? Or are we face to face with a desperate or most rational effort from the deepest resources of the unconscious of us all to rescue civilization from the pit and plague of its bedding?”
—Norman Mailer (b. 1923)
“Inter-railers are the ambulatory equivalent of McDonalds, walking testimony to the erosion of French culture.”
—Alice Thompson (b. 1963)