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Title: Coastal Sea Defences

Lesson Objective:

To recognise various seadefences and look at ways ofpreventing coastal erosion

Starter:

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Waves create 2 featurestat tell us tat erosion isappening:

Wave cut notcesWave cut platfor!s

Cli" #eatures

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Wave Cut $otc

Wave Cut $otc

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  Wave Cut%latfor!

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Wave Cut

Notch

Wave Cut

Platform

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We !ust try to stop te sea

fro! eroding te cli"& Wecan do tis in a nu!ber ofdi"erent ways&

Coastal

Defences

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Tere are several ways toreduce te e"ects of coastal

erosion& Te erosion can create!any proble!s for businessesand residents along te

coastline& Te coastline is soi!portant for locals tat it !ustbe protected& 'nfortunately(proper protection can cost up to)*!illion er *++ !etres&

,educing coastal erosion

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Con-ict can occur wen tecouncil will not protect tecoast but locals want te!

to& .t Walton te councilave not protected tefar!land /probably because

te land is not wort enoug0but tey ave protected teousing areas& Tis causes

con-ict because far!land isbein wased into te sea&

Walton on te $a1e(sse3

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Coastal protection is allabout trying to

stop te cli" fro! collapsing&Tese are

so!e ways to protect te

cli":

Coastal%rotection

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*& 4abions: large !etal cagesof rocks stop waves reacing

te cli" 

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2& ,ip rap: largerocks/natural orarti5cial0at te foot ofte cli" 

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6& ,evet!ents: woodenfra!es wic break upte power of te waves

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7& 4roynes: tese are used tocreate a beac at te foot of tecli"& Tis way te waves don8treac te cli"&

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9& Sea wall: tis literallycreates a barrier tote sea

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& Drains in te cli" : to reduce tedanger of cli" collapse rain water!ust be re!oved& Drains are put

into te cli" and te water is pipedto te sea

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;& O" sore reef : tis stops strongwaves fro! itting te cli"< tewaves break out to sea&

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=& >eac ? te wavesbreak on te beac

and not te cli"