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Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

Subsurface Characterization of Selected Water Bodies in the St Johns River Water Management District, Northeast Florida

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Lake Lochloosa
Alachua County, Florida

Introduction | Subsurface Characterization

Subsurface Characterization

Lake Lochloosa
Lake Lochloosa. Black lines show profile locations.
The quality of the seismic profiles obtained from Lochloosa Lake is generally poor. This is primarily due to both a pervasive bottom multiple throughout the lake and abundant acoustic noise in the subsurface. The latter is probably due to the high organic content in the bottom sediments seen in the marsh lakes of this area. Scott (1988) describes the top of the Hawthorn Group (Coosawhatchie Fm.) to be very near the surface in this area (<6 m, 19.7 ft). Although this is not readily apparent in the seismic profiles acquired in Lochloosa, it does correlate with some of the data obtained in neighboring Lake Orange. In some areas of Lochloosa Lake, there does appear to be a reflection visible at about 8 ms (6 m) although it is not readily mappable due to the noise and bottom multiple. The most characteristic feature visible in the seismic profiles from Lochloosa are similar to the type 1 feature shown in the explanation on the Seismic Track Map. This is a typical return in this type of lake and is probably not related to subsurface structure. In several places it is possible that numerous, high angle reflections may indicate a type 4 feature (Track Map ).

Seismic profile for A-A'
Profile A-A'

Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

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Updated December 02, 2016 @ 11:25 AM (JSS)