Surfer's Beach: by Bob Battalio, PE
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Transcript of Surfer's Beach: by Bob Battalio, PE
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8/8/2019 Surfer's Beach: by Bob Battalio, PE
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ur ers
eacan
ar
o nt
HalfMoonBay(ElGrenada,CA)
BobBattalio PEPrincipal,PWA
PresentedtoSurfriderFoundation,SanMateoCountyChapter
c o er
,
BobBattalio,October22,2009
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ProfessionalCivilEngineer(CA,WA,LA,OR)practicing22years
CoastalProcessestrainingfromUCB,1985
Principal@PhilipWilliams&Assoc.,Ltd(PWA),SanFranciscowww.pwaltd.com
,
primarilyshores,
inlets,
lagoons
and
tidal
wetlands,
also
hazard
mapping
Favoritelocation TaravalStreet,OB
Inducted,DoubleOverheadAssociation(DOA)atWiseSurfShop,late1980s
Pacificaresidentsince1989
StartedsurfingMavericksinearly1990s
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Pillar ointharbor
TrapssandsupplytoHMBlittoralsubcell,causingsedimentdeficitanderosion
Breakwater
causeswave
reflection
which
increases
longshore transporttowardsouth
ShoalinginPillarpointHarbor
IncreasederosioninsouthernHMB
Wavereflectionimprovessurflocally(notaproblem)
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Hookshapedbaybetweenheadlands
Waverefractionanddiffractionresultsinhookshapedshoreplanform
supply
Dischargefromstreamsformdeltaicperturbationsrom oo s ape
Wavessmoothoutperturbations,transportsand
southward WavesandSandcanmovethroughbreakwaters
Sanddepositsinshelteredareas
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Creeksandhistoricconditions
Source: SFEI
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HalfMoonBay
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HalfMoonBayLittoralCellHalfMoonBayLittoralCell
Sand Trapped In
Pillar Point Harbor
Erosion hot spot at surfers beach
Sand Transport (Net, Average Annual)Sand Transport (Net, Average Annual)
Legend
sand loss > sand supply = erosion
Sand Discharge
Net Sand Transport Direction
Sand from Shore Erosion
Cell Boundary
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8/8/2019 Surfer's Beach: by Bob Battalio, PE
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Reducedswellexposureduetoshelteringby
Reflectionfrombreakwatercauseswave
crossingan pea y rea erst atpea
Especiallygoodonsouthandsouthwestswells
duetoexposureplusreflection
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WaveReflection
Peak
Reflected
Waves
Incident Waves
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8/8/2019 Surfer's Beach: by Bob Battalio, PE
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RecentPhotograph
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Armorroad/shore
O s ore
rea waters Offshorereef
Bypasssand/beachnourishment
Reroutehighway1
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,
DaylightandRerouteDeerCreek
Set ac
RerouteHig way
1
BeachNourishment
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8/8/2019 Surfer's Beach: by Bob Battalio, PE
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550 Kearny Street, Suite 900
San Francisco, CA415.262.2300
www.pwa-ltd.com
Bob Battalio, PE
[email protected] 415-262-2313
