Sea Surveyor, Inc
MARINE SURVEYS
SINCE 1985

 

 

Precision marine surveys for the engineering community

 

 

Oceanside


Seismic Reflection Survey

 

Client: San Diego County Water Authority

Completion Date: 2012

Contract Value: $120K

ChirpIn 2011, Sea Surveyor, Inc. conducted a seismic reflection (subbottom profiling) survey of a 1-mile (offshore) x 4-mile (alongshore) area at the U.S. Marine Corps Base, Camp Pendleton (San Diego County) in support of a proposed seawater desalination plant.  The purpose of the survey is to map the buried paleochannels from the San Luis Rey and Santa Margarita Rivers.  Maps from the survey were used by engineers for selecting desalination plant location, undersea pipeline design, and buried  intake feasibility.

Sea Surveyor conducted the seismic reflection survey using two (2) sizes of CHIRP subbottom profilers towed behind our 72’ research vessel LIGHTNING.  The 500-lb SB-0512 towfish penetrated 40’-50’ into the subbottom, while the 200-lb SB-216 towfish provided high-resolution acoustic images of the stratigraphy in the upper 30’.

Paleo Channel1

Subbottom profile of San Luis Rey River’s buried paleochannel.

Paleo Channel2

South bank of Santa Margarita River paleo-channel, with San Mateo Formation at left.

 

 

 

 

 

 

 

 

Sea Surveyor prepared a bathymetric contour chart referenced to NAVD-88 elevation.  The seismic reflection chart is referenced to the NAVD-88 vertical datum and shows the buried paleochannels of the Santa Margarita and San Luis Rey Rivers.

 

Isopach2

Isopach (sediment thickness) map with example cross-sections .

 

 

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