rivers engirding techniques Flashcards
sea well description and type
hard
a wall often made of concrete which protects the coast from waves
gryones description and type
wood or steal piling built at right angles top the beach that traps beach material being moved by longshore drift
rip rap description and type
large boulders piled up to protect the coastline
advantages of sea walls
prevents both erosion and flooding
disadvantage of sea walls
very expensive to build and to matin
ugly
advantages of grooynes
slows beach erison creates wide beach
disadvantages of groynes
strives beaches downstream of sediment increasing erisoion
advantages rip rap
cheaper to construct than sea walls and does similar job of absorbing wave energy
disadvcante of rip rap
boulders can be undercut and be dislodged in heavy storms
beach replenishment description
pumping or dumbing sand and shingle back onto a beach to replace eroded material
advantages of beach replenishment
beaches absorb wave energy and help protect against costal erosion
disadvantages of beach replenishment
has t ve repeated often which is expensive
fencing hiding and replacing vegetation
helps stables sand dunes or beaches and reduces wind erison
fencing hiding and replacing vegetation
advantages
a relatively cheap way to protect against flooding and erison
fencing hiding and replacing vegetation
disadvantages
hard to protect larger areas of coastline this way
