it's a sudDEn fall of water. it's a fALL OF WATER. WATER faLL. whAt did u thiNK IT WAS
what's not common sense is?? how it's formed :0
river flows from resistant 2 less
resistant. ah, that makes sense!!
so the downstream not resistant rocks = !! eroded faster !!
omg waterfall commENCE
but w/ ths said, use the keywords GRADIEnt and dIFFERENTIAL EROSION!!!!!!!
pLUnge pools, too !!
... haha water PLUNGEs against the rocks below the waterfall,
but alas, it's not that simple . this depression is deepened &
enlarged by the HYDRAULIC ACTION of the plunging water !!
and also, the swirling of water there, causing aBRASIOn.
there u have it! a plunge pool
annotation coming
okay so
undercutting
= gorge
the overhang str8 up collapses :00
and then the plungepool !! yaY
blue, to represent wATER
meanders
bends in a river as
sinuosity increases
usually occur in
rivers w coarser
load,,
they lied. they said we aren't
tested on pools & riffles, but its
related so listen up
carisse.. what r pools nd riffles
pools r deeper parts of the river
where fine sediments like silt ! r
deposited
riffles r shallow !! where coarser stuff like
pebbles r deposited
um.. hoW?? u make 0 sense
riffles slow down velocity before it picks up again!! neat
so like,, alternating velocity, different levels of erosion = meander s!
water tends to flow faster around the
bends on the oUTER side, more erosion!1
then this eroded stuff slides
down, forms a river cliff ,,, the cliff
is concave shaped !! so conCAVE
BANK, outsiDE
as for the inner banks, water is slower, more deposition!!
deposits have this gentle slip off slope,, inner bank = convex bank
oxbow lakes
gdi. they should call it a horseshoe
lake. it's horseshoe shaPED
formed after meanders!1 lateral erosion &
undercutting occur on the concave bank, deposition
on convex
the continuous erosion / deposition make the convex and
concave bank get closer,, basically a v pronounced meander
yEs ! the narrow neck of land is finally cut through, either
by lateral erosion of 2 concave banks or the v strong
currents of a flood
levees
ok so like. when it floods !! we got a problem
but we have levees!1 niCE
basically, levees block the water from overflowing and going where
we don't want it to go.
they're naturally made of earth!! like the natural movement
of water pushes the sediments to the side of the river
floodplaiNS
are like, plains which hold the excess water
when there;s a flood!
they hodl the excess water that gets past
the levees to prevent furTHEr flooding,,,
okay here's some annotating for the rly small picture
the green part is the flood plain. when the
river floods, that's where the flooded water
goes !!!!!!!
transportation
foUR TYPEs
(1) SOLUTION
minerals r dissolved in the water and carried along as a solution!!
(2) SUSPENSIOn
rEEaaaly fine particles are brought along in the water !!
(3) SAltation
small pebbles & stones bounced along the river bed !! ah cute
(4) TRACTIOn
hUUuuge ass boulders / rocks are
bounced bOUcned along the river bed :))
eroSION!!!!
FOUR TYPEs
(1) HYDRAULIC ACTION
the force of the river against the banks which causes air to be trapped in
the cracks. the pressure weakens the banks and gradually wears it away
(2) ABRASION
rocks carried along by the river wear
down the bed and banks !!
(3) ATTRITION
rocks being carried by the river smash
tgt and break in2 smaller particles
(4) soLUTION
soluble particles are dissolved into the river,,, some acidic thing
lmAO