COASTS PHYSICAL AND HUMAN PROCESSES Flashcards
biological weathering
plant roots
mechanical weathering
freeze thaw
wave acton
swash and backwash
4 types of erosion
hydraulic
abrasion
attrition
solution
rocks smacking together
attrition
rocks smacking cliff face
abrasion
waves force air into cracks
hysraulic
rocks dissolve from sea water
solution
destructive waves
tall short
strong backwash (destroy with backshots)
steper waves
higher frequency
steep beach
sliding
rocks from bedding planes slide down cliff like kid on slide, slide doesnt moves
slumping
rotational slip cuz saturated makes it lube
slump over and jerk it with lube
rock fall, rapid, stays together till its hits water
rapid, stays together till its hits water
transport types
traction
suspension
slatation
solution
when a rock rolls along the cround
traction like tractor
rock bounces on ground
supsension like i need to fix my suspension as my biike is too bouncy
when rock is held in water
suspension - not dissolves
suspended in motion - not hitting ground
dissolved transported
solution
LSD 5 points
wave swash carries sediment up the beach in direction of prevailing wind
loses energy and comes back down perpendicular to the beach
due to gravity
process repeats transporting sediment along the beach
geology
type of rock
discordant - alternating
concordant - 1 type
litholigy
rock characteristics
factors influencing coast
vegetation
sea level
isostatic readjustment
thermal expansion
eustatic change
other already menmtioned
how vegetation influences coast
biological weathering
encourage deposition
protecton
how sea level effects coasts
landfrorm crreatioon and flooding
isostatic vs estatic
iso - land moves relative to sea - e.g ice sheet wheighs it down is removed therefore moves up - iso iso land vs torta
eustatic is sea levelkl rise due to more water eugeune came in the sink so it rose
erosional landforms x3
bays and headlands
cliffs and wave cut platforms
cave arch…
depositional landforms x3 (groupss)
beaches
spits and bars and tombolos
suspate foreland
headland and bays
waves approach
as they approach coast and gets shallow
waves refrract in the shape of the coastline
energy is therefore concentrated on headlands
is headland converging or diverging
converging
headlands and bays key points
wavws approach as shallow and refract concentrate on headlands
i waved at the approaching girl but she was shallow so i changed angle of travel sop i can concentrate on getting hade
gliffs and wave cut [platfomrs
erosion conc at base
erodes material creating a wa ve cut notch
undercutting causes cliff to collapse due to gravity and causes a wave cut platform
repeats over time so cliff retreat
cave arch…
crack at bsae of headland within intertidal zone
grows dfue to hydraulic action
widened by weatheroiing
wave cut notch
grows
till it goes through and two caves join to form arch
arch becomes unstable and collapsesdue to gravity leaving stack which erosdes into stump
stack vs stump
stack can be seen at high tide
beaches
sand and shingle are deposited in low energy araeas
spit
LSD
sudden change in shpaee of coast
momentum
deposits
over time builds up
salt marsh
form behind spits as it is low energyand stagnatn
cuspate foreland
when 2x LSD so triangle
bars
joined 2 sides of bay
tombolo
bar but with an island instead of 2 sides of a bay
