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Using Low-Cost Multi-Depth Samplers to Characterize the Variability of Specific Conductance in Coastal South Florida Beaches
Title
Using Low-Cost Multi-Depth Samplers to Characterize the Variability of Specific Conductance in Coastal South Florida Beaches.
Creator
Shaver, Kyle David, Root, Tara, Briggs, Tiffany Roberts, Florida Atlantic University, Department of Geosciences, Charles E. Schmidt College of Science
Abstract/Description
A small body of saline rich water rests in the saturated zone between the foredune and the shoreline at certain beaches. This region is beneath the water table and the top of the fresher groundwater, known as the Upper Saline Plume (USP). The USP is significant because density driven flow and chemical fluxes between freshwater, rainwater, and seawater contribute to biogeochemical processes in the subterranean estuary (Duque et al. 2020). The occurrence of the USP has been observed along...
Show moreA small body of saline rich water rests in the saturated zone between the foredune and the shoreline at certain beaches. This region is beneath the water table and the top of the fresher groundwater, known as the Upper Saline Plume (USP). The USP is significant because density driven flow and chemical fluxes between freshwater, rainwater, and seawater contribute to biogeochemical processes in the subterranean estuary (Duque et al. 2020). The occurrence of the USP has been observed along beaches that have a moderate to gentle slope, fine to medium grain size, and higher wave energy. The goal of this study was to determine if conditions for the presence of USP are consistent throughout different coastal beaches in southeast Florida while mapping the groundwater salinity across the beach. To identify the existence and delimit the boundary interface of the USP in the southeastern coast of Florida, multi–depth samplers were designed, built, and deployed along cross-shore transects at Jupiter and Gulfstream Beaches in Palm Beach County, FL. Groundwater samples were extracted along the transects to measure specific conductance. Although this study did not confirm the existence of the USP in South Florida beaches, an intermediate zone of water that is in-between the specific conductance ranges of relatively freshwater and relatively salty water was identified. Furthermore, the size of this intermediate zone was corresponded with beach slope, showing larger intermediate zones for steeper slopes and vice versa. Finally, temporal changes in the location and morphology of this intermediate zone were also identified in relation to a distinct disturbance event (Hurricane Isaias) which resulted in elevated ocean water levels.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013625
Subject Headings
Beaches--Florida, Freshwater, Seawater, Water resources--Management
Format
Document (PDF)
Comparison of the spatiotemporal variability of dredge material at two inletadjacent beaches
Title
Comparison of the spatiotemporal variability of dredge material at two inletadjacent beaches.
Creator
Scheinkman, Austin, Briggs, Tiffany Roberts, Florida Atlantic University, Department of Geosciences, Charles E. Schmidt College of Science
Abstract/Description
This study analyzed two different inlet management strategies being utilized in Palm Beach County and compared how the downdrift beaches were affected by those strategies throughout the year. Cross-sectional beach profiles, Digital Elevation Model comparisons, and subaerial volumetric change were analyzed for patterns in postplacement beach morphology. Trends in cross- and alongshore grainsize were also analyzed. In Boca Raton the inlet was dredged multiple times a month depending on the...
Show moreThis study analyzed two different inlet management strategies being utilized in Palm Beach County and compared how the downdrift beaches were affected by those strategies throughout the year. Cross-sectional beach profiles, Digital Elevation Model comparisons, and subaerial volumetric change were analyzed for patterns in postplacement beach morphology. Trends in cross- and alongshore grainsize were also analyzed. In Boca Raton the inlet was dredged multiple times a month depending on the level of infilling and the material was placed on the beach immediately downdrift of the inlet. The downdrift beach of the Boca Raton inlet underwent a cycle of shoreline advance in the summer and shoreline retreat in the winter. It was dominated by seasonal processes and its morphologic change was the direct result of shifts in the wind and waves without having a beach more than 60 to 80 meters over the course of the study. In Jupiter, the inlet was dredged on a near annual basis and the material was placed 600m south of the inlet. The size and scope of the larger one-time annual nourishment project resulted in beach widths upwards of 120 meters. The equilibration process that followed in both the cross- and alongshore are what dominated the morphological trends experienced at the site. The results of this study should help coastal managers without current inlet management strategies, compare and overview two different successful inlet management options. For future studies, researchers should extend the monitoring period and extend profiles to the depth of closure to capture. Sediment is a valuable resource, and it’s important for best management practices to maximize benefits and protect downdrift beaches for long-term resiliency of coastal communities.
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Date Issued
2022
PURL
http://purl.flvc.org/fau/fd/FA00014010
Subject Headings
Inlets, Coastal zone management, Sediment, Beaches--Florida
Format
Document (PDF)
Use of Ground Penetrating Radar (GPR) in a Study on Beach Morphodynamics at Red Reef Beach, Boca Raton, Florida
Title
Use of Ground Penetrating Radar (GPR) in a Study on Beach Morphodynamics at Red Reef Beach, Boca Raton, Florida.
Creator
Camara dos Santos Porto, Sabrina, Briggs, Tiffany Roberts, Comas, Xavier, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description
The internal architecture of a beach system can provide clues into the processes involved in its formation, including depositional processes, and/or driving mechanisms (Billy et al., 2014). Several unique events such as cold fronts or Hurricane Irma caused conditions that resulted in erosion and accretion changes in Red Reef Beach - Boca Raton, throughout the year of 2017. Since the lateral extent of these changes is difficult to evaluate using traditional methods such as coring, a Ground...
Show moreThe internal architecture of a beach system can provide clues into the processes involved in its formation, including depositional processes, and/or driving mechanisms (Billy et al., 2014). Several unique events such as cold fronts or Hurricane Irma caused conditions that resulted in erosion and accretion changes in Red Reef Beach - Boca Raton, throughout the year of 2017. Since the lateral extent of these changes is difficult to evaluate using traditional methods such as coring, a Ground Penetrating Radar (GPR) was tested, which allows for a good lateral resolution (cm scale), to image the distribution and evolution of these sediments. The objectives of this study were to 1) explore the lateral variability in the internal architecture of sediments in Red Reef beach in Boca Raton (FL) using an array of ground penetrating radar (GPR) measurements constrained with coring and sediment analysis; 2) explore how dynamics of erosion and accretion induced by changes in wave activity and related to tide variation and storm events, may affect surface topography and the sedimentary internal architecture of beach deposits, using RTK GPS and GPR time-lapse measurements; 3) to explore changes in the lateral extent of the freshsaltwater interface along the beach profile in relation to tide variation and storm events. Reflectors identified in the GPR images showed some evidence of erosional and accretionary surfaces preserved in Red Reef beach. These measurements were repeated over time coinciding with certain events (such as Hurricane Irma) to explore their effects in terms of sediment erosion and accretion as reflected in changes in topography (using time-lapse GPS-RTK measurements), and changes in the internal sedimentary architecture (using time-lapse GPR measurements). The datasets collected also revealed the temporal evolution of the salt-freshwater interface, showing how the lateral extent of saltwater saturated sediment (inferred from areas of GPR signal attenuation along the profiles) evolved over time. This study shows the potential of GPR to provide information about beach sediment processes and dynamics at resolutions beyond traditional measurements (such as coring). It also shows the importance of combining methods that are complementary, such as the use of RTK GPS to explore changes in topography, and GPR that provides information on subsurface sedimentary architecture and the mechanism of change such as post-storm recovery. This study has implications for better understanding changes in coastal sedimentary deposits and processes, both at the subsurface, particularly after high-energy events, such as hurricanes, that result in rapid changes in erosion and/or accretion of sediments.
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Date Issued
2017
PURL
http://purl.flvc.org/fau/fd/FA00005947
Subject Headings
Dissertations, Academic -- Florida Atlantic University, Beaches--Florida, Ground penetrating radar., Sediments (Geology)--Analysis.
Format
Document (PDF)
GEOGRAPHIC FACTORS INFLUENCING PUBLIC ACQUISITION OF BEACHFRONT LANDS AS ILLUSTRATED IN PALM BEACH COUNTY, FLORIDA
Title
GEOGRAPHIC FACTORS INFLUENCING PUBLIC ACQUISITION OF BEACHFRONT LANDS AS ILLUSTRATED IN PALM BEACH COUNTY, FLORIDA.
Creator
FLANAGAN, ROBERT LAWRENCE., Florida Atlantic University, Latham, James P., Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description
This study evaluates the influence that several geographic factors have upon the public acquisition of beachfront lands. It demonstrates that they have a continuing and very important impact upon efforts to establish public beaches. Factors were analyzed to reveal differing aspects of their influence upon such acquisition, and particularly how they differ in various locations. The analyses illustrate spatial interrelationships that exist among geographic factors relating to the beach lands:...
Show moreThis study evaluates the influence that several geographic factors have upon the public acquisition of beachfront lands. It demonstrates that they have a continuing and very important impact upon efforts to establish public beaches. Factors were analyzed to reveal differing aspects of their influence upon such acquisition, and particularly how they differ in various locations. The analyses illustrate spatial interrelationships that exist among geographic factors relating to the beach lands: physiography, patterns of settlement, political fragmentation, ownership, access, coastal economics, groups and individuals, and governmental roles. The influence of geographic principles are also illustrated by the study. It is demonstrated that awareness of the geographic influences involved in a public beach acquisition program could permit a more knowledgeable analysis of a beach area; thereby contributing to the possibilities for a better program and increased success in acquiring public beaches.
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Date Issued
1975
PURL
http://purl.flvc.org/fcla/dt/13755
Subject Headings
Land use--Florida--Palm Beach County, Beaches--Florida--Palm Beach County, Public lands--Florida--Palm Beach County--Recreational use
Format
Document (PDF)