obsequent การใช้

• Obsequent streams are insequent streams that now flow in an opposite direction of the original drainage pattern.
• 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.
• 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.