Data pool­ing on beach sand

Western Suburbs Weekly - - Fashion -

COTTESLOE Coun­cil’s beach study has found that sand con­tin­ues to cause ero­sion in North Cottesloe, with data be­ing used to de­ter­mine if sea rises will af­fect any pro­posed ocean pools.

“Ab­so­lutely it will have to be taken into con­sid­er­a­tion, and the pos­si­bil­ity of any fu­ture coastal ero­sion will be taken into ac­count,” Mayor Jo Dawkins said.

The third an­nual Cottesloe Coastal Mon­i­tor­ing study from April 2016 to March this year also rec­om­mended the coun­cil con­sider how much sand would be needed for re­place­ment sand dump­ing.

Sur­veys for the study found ero­sion at 15 of 18 sites at North Cottesloe Beach, where es­tate agent Chris Shellabear has mooted an ocean pool.

There was less sand at two of the 10 sites from Cottesloe Beach south to the Dutch Inn Groyne but at only three of the nine sites south of the groyne.

It was noted there was a net over­all loss of sand on the town’s 4.5km of coast, mostly north of Cottesloe Groyne, when sea­sonal changes be­tween win­ter and sum­mer beach pat­terns were stud­ied in Novem­ber last year and April this year.

How­ever, in March there was an un­sea­sonal sum­mer storm that un­der­mined beach steps at Cottesloe Groyne.

Un­sea­sonal and more pow­er­ful sea­sonal storms are cli­mate change pre­dic­tions, with ef­fects am­pli­fied by any sea rises.

How­ever, the study’s 2016-17 re­port said com­par­isons of sea­sonal beach pat­terns over sev­eral years in­di­cated sim­i­lar re­sults and there was con­fi­dence the pat­terns had not been “heav­ily in­flu­enced” by any changes in the sea­sons.

En­gi­neer­ing ser­vices man­ager Nick Wood­house said the over­all ero­sion was in the “gen­eral area” of that pre­vi­ously recorded, but a min­i­mum of 3-5 years of data was still needed.

A de­ci­sion will be made on whether the groyne’s steps are re­paired, re­placed or ren­o­vated for uni­ver­sal ac­cess, he said.

Town engi­neer Nick Wood­house and Cottesloe Mayor Jo Dawkins where the study found on­go­ing ero­sion at North Cottesloe.

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