ckh presentation3-mar 2014.pptx ... · boulder walls: early 1970's comings & goings feb...
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[check�whether�audience�understand�this�concept�of�greater�erosion�from�turbulence,�reflected�lateral�wave�energy�(greater�for�steeper�slopes�and�more�solid�wall�designs)�,�and�loss�of�storm�demand�from�behind�wall]
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• a�perfect�combination�of�cost�effectiveness�giving�max�protection�for�the�min�cost�with�best�capacity�for�repair�and�maintenance.”��
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“Although�the�boulder�walls�proved�useful�for�temporary�protection,�it�is�not�probable�that�they�would�withstand�the�Wave�attack�during�a�period�of�heavy�cyclones.�
The�walls�do�not�serve�for�beach�improvement;�they�even�have�a�negative�effect�on�the�natural�restoration�of�the�beaches�in�front�of�them,�due�to�increased�turbulence�as�a�result�of�the�reflection�of�the�waves�against�the�relatively�steep�slopes�of�the�walls.
Eventually�the�walls�must�be�covered�by�sand,�especially�because�they�were�built�on�the�very�beaches�where�severe�erosion�occurred�in�the�past�and�may�occur�again.”
as�the�ultimate�insurance�to�protect�real�property�once�all�other�possible�mitigating�measures�had�been�overwhelmed�by�the�sea”
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