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OFFSHORE SAN DIEGO SURVEY FOR BEACH
SAND RENOURISHMENT
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Client: San
Diego Association of Governments (SANDAG) Completion Date: 1999 Contract Value: $ 500K
In 1999, the San Diego Association of Governments
(SANDAG) contracted Sea Surveyor to conduct precision hydrographic,
geophysical, and vibracoring investigations at 10 offshore borrow sites in San
Diego County. The objective of
the offshore sand investigation is to: 1) map the horizontal and vertical
extent of suitable beach sand within the 10 proposed borrow sites, and 2)
compute the volume of suitable beach replenishment material contained
within each site.
Sea Surveyor conducted Geophysical Surveys at
the proposed borrow sites and then collected 125 sediment core samples
using an ALPINE vibracore.
The geophysical surveys used differential GPS navigation to map each
site with a side-scan sonar, marine magnetometer, 2 types of subbottom
profilers, and a survey-grade depthfinder.
After interpreting the geophysical data, 125 sediment core samples
of nominal 20’ length were collected, logged, photographed, subsampled and
archived. The subsamples from the vibracores
were analyzed for grain-size, lithology, and chemical constituents.
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20’Core Sample 20’ Alpine Vibracore
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Results from
Geophysical Survey and Vibracore Investigation San Diego Offshore Borrow
Sites
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