Landforms Resulting from Erosion
- Created by: JemmaSnowdon
- Created on: 28-04-18 11:59
Landforms Resulting from Erosion
-INTERLOCKING SPURS
-WATER FALLS
-GORGES
WHAT ARE THE CHARACTERISTICS OF INTERLOCKING SPURS
-STEEP GRADIENT
-CONVEX SLOPES
-PROJECT FROM ALTERNATE SIDE OF THE VALLEY
-SEPARATED BY NARROW VALLEY FLOOR (USUALLY FILLED BY RIVER)
-SOMETIMES WOODED
-SOMETIMES HAVE SCREE SLOPES
DESCRIBE THE FORMATION OF INTERLOCKING SPURS (STAG
- IN UPPERCOURSE RIVER USES MOST ENERGY OVER COMING FRICTION
- CHANNEL IS SHALLOW + NARROW
- ANY EROSION IS VERTICAL BY HYDRAULIC ACTION
DESCRIBE THE FORMATION OF INTERLOCKING SPURS (STAG
- RIVER FOLLOWS WINDING PATHS
- AVOIDS OBSTRUCTIONS OF HARDER ROCK
- RIVER TAKES EASIEST ROUTE
DESCRIBE THE FORMATION OF INTERLOCKING SPURS (STAG
- RESULTS IN PROJECTIONS OF HARD ROCK ENTERING VALLEY FROM BOTH SIDES
- PROJECTIONS ARE CALLED INTERLOCKING SPURS
DESCRIBE THE FORMATION OF WATERFALLS (STAGE 1)
- RIVER MEETS BAND OF SOFTER LESS RESISTANT ROCK
- CALLED THE UNDERLYING
- SOFTER ROCK IS EROED AWAY MORE QUICKLY
DESCRIBE THE FORMATION OF WATERFALLS (STAGE 2)
- PROCESSES OF EROSION SUCH AS ABRASION CAUSE UNDERCUTTING
- MORE RESISTANT ROCK IS LEFT UNSUPPORTED + OVERHANGS
DESCRIBE THE FORMATION OF WATERFALLS (STAGE 3)
- WATERFALLS IS NOW FULLY ESTABLISHED
- GORGE IS CREATED AS THE WATERFALL MOVES FURTHER BACK
DESCRIBE THE FORMATION OF GORGES
- WATERFALL ERODES SOFT ROCK UNDERNEATH
- CAUSES HARD FROCK TO FALL
- WATERFALL MOVES FURTHER BACK
- AS IT DOES THIS A GROGE IS CREATED
- THIS IS REPEATED OVER TIME + GORGE GETS BIGGER
WHY THALWEG IS FASTER ON 1 SIDE OF RIVER CHANNEL T
- EXSISTING BEND IN RIVER
- OBSTRUCTION IN PART OF CHANNEL
- VARIATION IN CHANNEL DEPTH
THALWEG
-FASTEST CURRENT OF THE RIVER
HELICOIDAL FLOW
- CORCKSCREW MOTION OF THE WATER WHICH SENDS RIVER ENERGT TO ONE SIDE OF THE MEANDER
FORMATION OF MEANDERS (STAGE 1)
-LATERAL EROSION OCCURS THROUGH ABRASION + HYDRAULIC ACTION
- CAUSED BY THALWEG ON OUTSIDE BANK
- MAY HAVE ALREADY BEEN AN EXSISTING BEND IN THE RIVER + THALWEG DEVELOPS THIS
FORMATION OF MEANDERS (STAGE 2)
- RIVER CLIFF IS FORMED FROM WATER UNDERCUTTING
FORMATION OF MEANDERS (STAGE 3)
- HELICOIDAL FLOW ERODES OUTSIDE BANK
- MOVEMENT THEN DEPOSITS LOAD ON INSIDE BEND AS FLOW IS SLOWED BY FRICTION
FORMATION OF MEANDERS (STAGE 4)
- RIVER BED DEEPENS DUE TO VERTICAL EROSION
- RESULTS IN AN ASYMMETRICAL CROSS PROFILE
- SLIP OF SLOPE IS FORMED WHEN SAND + PEBBLES ARE DEPOSITIED ON INSIDE OF BANK
OX- BOW LAKE FORMATION (STAGE 1)
- MEANDER LOOP BECOMES VERY LARGE
- ONLY NARROW STIP OF LAND SEPARATES MEANDER NECK
- CONTINUED LATERAL EROSION
- NECK BECOMES INCREASINGLY NARROW
OX- BOW LAKE FORMATION (STAGE 2)
- RIVER FLOODS SO MAIN FLOW OF WATER CUTS STRAIGHT ACROSS NECK
-SHORT CUT BEGINS TO BREAK DOWN BANKS + CARVE NEW CHANNEL
OX- BOW LAKE FORMATION (STAGE 3)
- FLOODS RECEDE + RIVER REVERTS TO NORMAL MEADNERING CHANNEL
- PROCESS REPEATS OVER TIME WITH EVERY FLOOD EVENT
- NEW CHANNEL BECOMES SO ESTABLISHED BY CONTINOUS LATERAL + VERTICAL EROSION THAT IT BECOMES MAIN CHANNEL
OX- BOW LAKE FORMATION (STAGE 4)
- LOOP OF OLD CHANNEL IS INCREASINGLY DETATCHED AS ITS NO LONGER RECIEVING WATER
- SUBSEQUENT FLOODING CAUSES DEPOSITION ON RIVER BANKS AIDS DETACHMENT OF OLD LOOP
-MARSH PLANTS COLONISE THE AREA WHICH FURTHER WIDENS THE GAP
- IN TIME ONLY FAR END OF MEANDER IS LEFT SOMETIMES SERVERAL METRES AWAY FROM MAIN CHANNEL
- THIS IS THE OX-BOW LAKE
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