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Shelf geomorphology along the southeast Florida Atlantic continental platform: barrier coral reefs, nearshore bedrock, and morphosedimentary features
Title
Shelf geomorphology along the southeast Florida Atlantic continental platform: barrier coral reefs, nearshore bedrock, and morphosedimentary features.
Creator
Finkl, Charles W., Andrews, Jeffrey L.
Abstract/Description
Differentiation of continental shelf morphology along the southeast Florida Atlantic coast was based on interpretation of airborne laser bathymetry. The 600-km2 shelf study area, which had a shoreline extent of about 160 km and extended up to 10 km offshore, displayed a diverse range of seafloor morphologies that were characteristic of four main alongshore reaches. Reach I (sand flats and karst topography) in the northern part of the study area is terminated southward by the Bahamas Fracture...
Show moreDifferentiation of continental shelf morphology along the southeast Florida Atlantic coast was based on interpretation of airborne laser bathymetry. The 600-km2 shelf study area, which had a shoreline extent of about 160 km and extended up to 10 km offshore, displayed a diverse range of seafloor morphologies that were characteristic of four main alongshore reaches. Reach I (sand flats and karst topography) in the northern part of the study area is terminated southward by the Bahamas Fracture Zone, a major morphotectonic feature. Reach II (sand flats and coral reefs) is characterized by sand flats with diabathic channel fields leeward or shoreward of the Florida Reef Tract, the seaward margin of which occurs along the shelf break on the upper part of the continental slope. Reach III (sandflats, hardgrounds, and coral reefs) is characterized by extensive nearshore rock outcrops that are exposed as bare rock surfaces on the seafloor or are variously mantled by thin veneers of sand that are not thick enough to disguise the underlying rock structure. Reach IV (tidal sand flats and ridges, hardgrounds, and coral reefs) is dominated by tidal features that notably include fields of tidal sand ridges in the lee of the Florida Reef Tract. The barrier reef on the southeast Florida Atlantic coast, which transitions to Florida Keys shelf environments southward, grades northward to drowned karst topography that is overlain by sand sheets and sand waves. Tidal channels and associated bars, deltas, and shoals occur on the interface between Biscayne Bay and the Atlantic Ocean. This reconnaissance level characterization of continental shelf environments into morphological reaches in a geographic information system platform provides a basis for quantifying spatial distribution patterns of discrete landform units.
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Date Issued
2008
PURL
http://purl.flvc.org/fcla/dt/3174200
Format
Document (PDF)
Submarine geomorphology of the continental shelf off Southeast Florida based on interpretation of airborne laser bathymetry.
Title
Submarine geomorphology of the continental shelf off Southeast Florida based on interpretation of airborne laser bathymetry.
Creator
Finkl, Charles W., Benedet, Lindino, Andrews, Jeffrey L.
Date Issued
2005
PURL
http://purl.flvc.org/fcla/dt/3174401
Format
Document (PDF)
Interpretation of seabed geomorphology based on spatial analysis of high-density airborne laser bathymetry
Title
Interpretation of seabed geomorphology based on spatial analysis of high-density airborne laser bathymetry.
Creator
Finkl, Charles W., Benedet, Lindino, Andrews, Jeffrey L.
Abstract/Description
Airborne laser bathymetric (ALB) systems rapidly acquire large, high-quality datasets via variable swath widths that are independent of water depth. Laser bathymetric survey tools have applicability in clear coastal (Case II) waters down to 270 meters depth. Deployed along the southeast Florida (Palm Beach, Broward, and Miami-Dade Counties)coast, an advanced ALB system provided a continuous dataset for 160 kilometers of coast from onshore to 6 kilometers offshore. Digital terrain models...
Show moreAirborne laser bathymetric (ALB) systems rapidly acquire large, high-quality datasets via variable swath widths that are independent of water depth. Laser bathymetric survey tools have applicability in clear coastal (Case II) waters down to 270 meters depth. Deployed along the southeast Florida (Palm Beach, Broward, and Miami-Dade Counties)coast, an advanced ALB system provided a continuous dataset for 160 kilometers of coast from onshore to 6 kilometers offshore. Digital terrain models developed from this high-density bathymetric data permitted recognition of numerous seafloor features and bathymetric patterns from different image formats. Bathymetric analysis of the 600-km2 survey area on the narrow continental shelf shows inherited lithologic features that are partly covered by surficial sediments. Primary parabathic provinces include: (1) nearshore rocky zones dominated by the Anastasia Formation, (2) coralalgalreef systems (Florida Reef Tract [FRT]), and (3) marine terraces. Secondary sedimentary subprovinces include shoreface sands, inter-reefal sedimentary infills (coral rubble in basal sequences and near reef gaps), and finer-grained materials seaward of the FRT. Tertiary topographic features include: (1) longshore bar and trough systems, shoals, sand sheets, and diabathic channels; (2) reef crests and ledges, forereef spurs and grooves, sediment ramps in large reef gaps, and incised paleo-river channels; and (3) drowned karst topography. Hierarchical organization of these bathymetric features is now possible for the first time because of the increased accuracy and density of bathymetric data obtained by ALB systems.
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Date Issued
2005
PURL
http://purl.flvc.org/fcla/dt/3174249
Format
Document (PDF)
Coupling geological concepts with historical data sets in a MIS framework to prospect for beach-compatible sands on the inner continental shelf: experience on the eastern Texas gulf coast
Title
Coupling geological concepts with historical data sets in a MIS framework to prospect for beach-compatible sands on the inner continental shelf: experience on the eastern Texas gulf coast.
Creator
Finkl, Charles W., Andrews, Jeffrey L., Campbell, Thomas J., Benedet, Lindino, Waters, Jeffrey P.
Abstract/Description
Chronic erosion of beaches along the eastern Texas barrier island coast is increasingly mitigated by renourishment efforts that periodically place large volumes of sand onshore. Location of beach-quality sands on the inner continental shelf is challenged in an environment where terrestrial rivers deposit fluvial sediments in back bays and lagoons instead of offshore and by shelf areas that are dominated by muds. The search for beach-quality sands thus requires understanding of the coastal...
Show moreChronic erosion of beaches along the eastern Texas barrier island coast is increasingly mitigated by renourishment efforts that periodically place large volumes of sand onshore. Location of beach-quality sands on the inner continental shelf is challenged in an environment where terrestrial rivers deposit fluvial sediments in back bays and lagoons instead of offshore and by shelf areas that are dominated by muds. The search for beach-quality sands thus requires understanding of the coastal geological framework and morphodynamic processes that accompanied late Quaternary evolution in the northern Gulf of Mexico. The occurrence of surficial sand deposits as positive bathymetric features on the seafloor (ridges, shoals, banks) and presence of sands buried in paleovalley (drowned channels) infill sequences makes for complicated search procedures that must accurately differentiate a range of sedimentary settings by geophysical and geotechnical surveys. Compilation of vast amounts of data from historical core logs and newly acquired information in a marine information system (MIS) permits spatial analyses in a format that is compatible with development of a sand search model. The resulting differentiated investigative sand-search methods, that comprise part of the Texas Sand Search Model (TSSM), are able to target potential borrow areas in ebb-tidal shoals, low-relief ridge deposits, high-relief banks, and in mud-covered paleovalley sequences.
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Date Issued
2004
PURL
http://purl.flvc.org/fcla/dt/3174246
Format
Document (PDF)
Sediment Ridges on the West Florida Inner Continental Shelf: Sand Resources for Beach Nourishment
Title
Sediment Ridges on the West Florida Inner Continental Shelf: Sand Resources for Beach Nourishment.
Creator
Finkl, Charles W., Benedet, Lindono, Andrews, Jeffrey L., Suthard, Beau, Locker, Stanley D.
Abstract/Description
Beach nourishment requires large volumes of sand from offshore and new sources are constantly sought for development. The sediment-starved continental shelf off the central-west coast of Florida has traditionally supplied beachquality sediments from ebb-tidal shoals and nearshore sand sheets, but as these supplies dwindle, sand searches increasingly look farther offshore for resources. Widely spaced sediment ridges, interspersed by karstified limestone seafloor (hard grounds), offer potential...
Show moreBeach nourishment requires large volumes of sand from offshore and new sources are constantly sought for development. The sediment-starved continental shelf off the central-west coast of Florida has traditionally supplied beachquality sediments from ebb-tidal shoals and nearshore sand sheets, but as these supplies dwindle, sand searches increasingly look farther offshore for resources. Widely spaced sediment ridges, interspersed by karstified limestone seafloor (hard grounds), offer potential as sand resources that can be exploited by dredging to renourish eroded beaches for shore protection. The sand ridges, late Holocene in age, are generally shoreface detached, sediment starved, and clustered in ‘‘ridge fields.’’ Six sediment ridge fields identified along 285 km of coast (Anclote, Sand Key, Sarasota, Manasota, Captiva, and Collier) contain about 1.4 billion cubic meters of sediments that are potentially available for dredging. Evaluation of these sediment sources, within the purview of the USMinval Code, requires the determination of resources, reserves, and level of certainty of assessment applied to a rating of resource potential. Present research is attempting to identify the overall resource potential with an eye toward eventually determining sand volumes in reserves, which will be much less than the total sand resource volume.
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Date Issued
2007
PURL
http://purl.flvc.org/fau/fd/FAUIR000371
Format
Document (PDF)
Fluvial sand sources for barrier island restoration in Louisiana: Geotechnical investigations in the Mississippi River
Title
Fluvial sand sources for barrier island restoration in Louisiana: Geotechnical investigations in the Mississippi River.
Creator
Finkl, Charles W., Khalil, Syed M., Andrews, Jeffrey L., Keehn, S., Benedet, Lindino
PURL
http://purl.flvc.org/fcla/dt/3183200
Format
Document (PDF)
Geomorphological mapping along the upper South Florida Atlantic continental platform; I: mapping units, symbolization and geographic information system presentation of interpreted seafloor topography
Title
Geomorphological mapping along the upper South Florida Atlantic continental platform; I: mapping units, symbolization and geographic information system presentation of interpreted seafloor topography.
Creator
Finkl, Charles W., Becerra, J. E., Achatz, V., Andrews, Jeffrey L.
PURL
http://purl.flvc.org/fcla/dt/3183204
Format
Document (PDF)