Download - Severe beach erosion at Surfside, Texas caused by engineering changes to the coast and rivers
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Severe beach erosion at Surfside,
Texas caused by
engineering changes to
the coast and rivers
Richard L. Watson, Ph.D.
TexasCoastGeology.com
(361) 749-4152
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Beach Erosion at SurfsideBeach Erosion at Surfside, , 1/11/20071/11/2007
TexasCoastGeology.com
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A River of Sand,A River of Sand,Sand Movement in the Surf ZoneSand Movement in the Surf Zone
• 700,000 to 800,000 cuyd/yr
• 250 Dump Trucks Per Day
• One Dump Truck Every 6 Minutes
TexasCoastGeology.com
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Galveston East JettyGalveston East Jetty, , 23 million cubic meters of sand 23 million cubic meters of sand storedstored(4 million dump trucks)(4 million dump trucks)
TexasCoastGeology.com
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TexasCoastGeology.com
7.6 million cubic meters lost from the
beach
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The Octagon, 1969
From Surfrider Foundation website
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The Octagon, 2000From Surfriders website
From Surfrider Foundation website
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H. Rita Landfall, H. Rita Landfall, 20052005
TexasCoastGeology.com
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Surfside Village after Surfside Village after RitaRita
TexasCoastGeology.com
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Surfside Village, TX after Surfside Village, TX after RitaRita
TexasCoastGeology.com
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Freeport Jetties, Surfside
Old Delta
Location
New Delta
Freeport Channel
TexasCoastGeology.com
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Brazos River Deltas Brazos River Deltas 19351935
TexasCoastGeology.com
New Delta
Old Delta
River moved in 1929 Location of Surfside
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Brazos River Delta, 1938
NEW OLD
Location of Surfside
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Brazos River Deltas Brazos River Deltas 19541954
TexasCoastGeology.com
Old DeltaNew Delta
Location of Surfside
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Brazos R. Sediment Brazos R. Sediment DischargeDischarge
From Mathewson & Minter, 1976
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Brazos Deltas circa 2002Brazos Deltas circa 2002
New Delta
Old Delta
Surfside
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Historic Shorelines, Historic Shorelines, SurfsideSurfside
1930 (river m
oved in 1929)19501960
19802000
From Texas General Land Office, Data by Bureau of Eco. Geol., Aerial Photo
2006
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Freeport dredging Freeport dredging doubleddoubled
TexasCoastGeology.com
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Relative Sea Level Rise, Galveston, Relative Sea Level Rise, Galveston, TXTX
From James Gibeaut, Bureau of Economic Geology, Univ. Texas, Austin
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Surfside has many causes of Surfside has many causes of shoreline retreatshoreline retreat
• Brazos River mouth and delta movedBrazos River mouth and delta moved
• Freeport Entrance greatly enlargedFreeport Entrance greatly enlarged
• Subsidence due to water extractionSubsidence due to water extraction
• Updrift sand impoundments at jettiesUpdrift sand impoundments at jetties
• Updrift sand loss at man-made inletUpdrift sand loss at man-made inlet
• Sea level riseSea level rise
• Reduced sand from rivers due to damsReduced sand from rivers due to dams
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New Brazos River Delta, 1999
San Bernard River
Surfside Village
Old
Sh
ore
line
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All Storms Since All Storms Since 18511851
TexasCoastGeology.com
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Don’t park too close to the Don’t park too close to the waterwater
TexasCoastGeology.com
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Richard L. Watson, Ph.D.
TexasCoastGeology.com
(361) 749-4152
That’s All Folks!