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Variability of dissolved reactive phosphate flux rates in nearshore estuarine sediments: Effects of groundwater flow
Title
Variability of dissolved reactive phosphate flux rates in nearshore estuarine sediments: Effects of groundwater flow.
Creator
Zimmermann, Carl F., Montgomery, John R., Carlson, Paul R., Harbor Branch Oceanographic Institute
PURL
http://purl.flvc.org/FCLA/DT/3174856
Subject Headings
Estuarine sediments, Phosphates, Groundwater flow
Format
Document (PDF)
Diel variations of dissolved ammonia and phosphate in estaurine sediment pore water
Title
Diel variations of dissolved ammonia and phosphate in estaurine sediment pore water.
Creator
Montgomery, John R., Zimmermann, Carl F., Peterson, Gary N., Price, Mary T., Harbor Branch Oceanographic Institute
Date Issued
1983
PURL
http://purl.flvc.org/fau/fd/FA00007476
Subject Headings
Estuarine sediments, Pore water, Ammonia, Phosphates
Format
Document (PDF)
A sediment budget for the Choptank River Estuary in Maryland, U.S.A.
Title
A sediment budget for the Choptank River Estuary in Maryland, U.S.A.
Creator
Yarbro, Laura A., Carlson, Paul R., Fisher, T. R., Chanton, J. P., Kemp, W. M., Harbor Branch Oceanographic Institute
Date Issued
1983
PURL
http://purl.flvc.org/FCLA/DT/3173002
Subject Headings
Suspended sediments, Estuarine sediments, Estuaries, Runoff, Coast changes, Beach erosion
Format
Document (PDF)
Tidal residual currents and sediment transport through multiple tidal inlets
Title
Tidal residual currents and sediment transport through multiple tidal inlets.
Creator
Liu, James T., Aubrey, David G., Harbor Branch Oceanographic Institute
Date Issued
1993
PURL
http://purl.flvc.org/FCLA/DT/3172972
Subject Headings
Tidal currents, Sediment transport, Tides, Inlets, Estuarine oceanography
Format
Document (PDF)
The collection, analysis and variation of nutrients in estuarine pore water
Title
The collection, analysis and variation of nutrients in estuarine pore water.
Creator
Montgomery, John R., Zimmermann, Carl F., Price, Mary T., Harbor Branch Oceanographic Institute
Date Issued
1979
PURL
http://purl.flvc.org/FCLA/DT/3174480
Subject Headings
Estuaries, Estuarine sediments, Nutrient pollution of water, Pore water, Mud flat ecology
Format
Document (PDF)
A comparison of ceramic cup and Teflon in situ samplers for nutrient pore water determinations
Title
A comparison of ceramic cup and Teflon in situ samplers for nutrient pore water determinations.
Creator
Zimmermann, Carl F., Price, Mary T., Montgomery, John R., Harbor Branch Oceanographic Institute
Date Issued
1978
PURL
http://purl.flvc.org/FCLA/DT/3174478
Subject Headings
Estuaries, Estuarine sediments, Nutrient pollution of water, Water --Sampling, Pore water
Format
Document (PDF)
Investigating variability of biogenic gas dynamics in peat soils using high temporal frequency hydrogeophysical methods
Title
Investigating variability of biogenic gas dynamics in peat soils using high temporal frequency hydrogeophysical methods.
Creator
Wright, William J., Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description
Peat soils are known to be a significant source of atmospheric greenhouse gasses. However, the releases of methane and carbon dioxide gasses from peat soils are currently not well understood, particularly since the timing of the releases are poorly constrained. Furthermore, most research work performed on peatlands has been focused on temperate to sub-arctic peatlands, while recent works have suggested that gas production rates from low-latitude peat soils are higher than those from colder...
Show morePeat soils are known to be a significant source of atmospheric greenhouse gasses. However, the releases of methane and carbon dioxide gasses from peat soils are currently not well understood, particularly since the timing of the releases are poorly constrained. Furthermore, most research work performed on peatlands has been focused on temperate to sub-arctic peatlands, while recent works have suggested that gas production rates from low-latitude peat soils are higher than those from colder climates. The purpose of the work proposed here is to introduce an autonomous Ground Penetrating Radar (GPR) method for investigating the timing of gas releases from peat soils at the lab scale utilizing samples originating from Maine and the Florida Everglades, and at the field scale in a Maine peatland. Geophysical data are supported by direct gas flux measurements using the flux chamber method enhanced by timelapse photography, and terrestrial LiDAR (TLS) monitoring surface deformation.
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Date Issued
2013
PURL
http://purl.flvc.org/fcla/dt/3361256
Subject Headings
Gas dynamics, Wetland ecology, Soil permeability, Estuarine sediments, Ground penetrating radar, Hydrogeology, Geophysics
Format
Document (PDF)
Hydrodynamics of mangrove root-type models
Title
Hydrodynamics of mangrove root-type models.
Creator
Kazemi, Amirkhosro, Curet, Oscar M., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Mangrove trees play a prominent role in coastal tropic and subtropical regions, providing habitat for many organisms and protecting shorelines against storm surges, high winds, erosion, and tsunamis. The motivation of this proposal is to understand the complex interaction of mangrove roots during tidal flow conditions using simplified physical models. In this dissertation, the mangrove roots were modeled with a circular array of cylinders with different porosities and spacing ratios. In...
Show moreMangrove trees play a prominent role in coastal tropic and subtropical regions, providing habitat for many organisms and protecting shorelines against storm surges, high winds, erosion, and tsunamis. The motivation of this proposal is to understand the complex interaction of mangrove roots during tidal flow conditions using simplified physical models. In this dissertation, the mangrove roots were modeled with a circular array of cylinders with different porosities and spacing ratios. In addition, we modeled the flexibility of the roots by attaching rigid cylinders to hinge connectors. The models were tested in a water tunnel for a range of Reynolds number from 2200 to 11000. Additionally, we performed 2D flow visualization for different root models in a flowing soap film setup. We measured drag force and the instantanous streamwise velocity downstream of the models. Furthermore, we investigated the fluid dynamics downstream of the models using a 2-D time-resolved particle image velocimetry (PIV), and flow visualization. The result was analyzed to present time-averaged and time-resolved flow parameters including the velocity distribution, vorticity, streamline, Reynolds shear stress and turbulent kinetic energy. We found that the frequency of the vortex shedding increases as the diameter of the small cylinders decreases while the patch diameter is constant, therefore increasing the Strouhal number, St=fD/U By comparing the change of Strouhal numbers with a single solid cylinder, we introduced a new length scale, the “effective diameter”. In addition, the effective diameter of the patch decreases as the porosity increases. In addition, patch drag decreases linearly as the spacing ratio increases. For flexible cylinders, we found that a decrease in stiffness increases both patch drag and the wake deficit behind the patch in a similar fashion as increasing the blockage of the patch. The average drag coefficient decreased with increasing Reynolds number and with increasing porosity. We found that the Reynolds stress (−u′v′) peak is not only shifted in the vortex structure because of shear layer interference, but also the intensity was weakened by increasing the porosity, which causes a weakening of the buckling of vorticity layers leading to a decline in vortex strength as well as increase in wake elongation.
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Date Issued
2017
PURL
http://purl.flvc.org/fau/fd/FA00004948, http://purl.flvc.org/fau/fd/FA00004948
Subject Headings
Fluid mechanics., Atmospheric models., Ocean currents--Mathematical models., Sediment transport., Estuarine oceanography.
Format
Document (PDF)
Alkaline Phosphatase Activity of Seagrass and Water Column Fractions in Florida Bay
Title
Alkaline Phosphatase Activity of Seagrass and Water Column Fractions in Florida Bay.
Creator
Kletou, Demetris, Koch, Marguerite, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Few phosphorus (P) depleted coastal marine ecosystems have been examined for their capacity to hydrolyze phosphomonoesters (PMEs). The purpose of this study was to examine seasonal APA partitioning between water column fractions (phytoplankton, bacteria and freely dissolved) and benthic autotrophs in Florida Bay, a P limited shallow estuary using low fluorescent substrate (MUF-P) concentrations (≤2.0 μm). APA was higher at the western and northcentral (751 and 695 nmol L^-1 h^-1) sites and...
Show moreFew phosphorus (P) depleted coastal marine ecosystems have been examined for their capacity to hydrolyze phosphomonoesters (PMEs). The purpose of this study was to examine seasonal APA partitioning between water column fractions (phytoplankton, bacteria and freely dissolved) and benthic autotrophs in Florida Bay, a P limited shallow estuary using low fluorescent substrate (MUF-P) concentrations (≤2.0 μm). APA was higher at the western and northcentral (751 and 695 nmol L^-1 h^-1) sites and driven by cyanobacterial blooms, compared to the P limited northeastern (359 nmol L^-1 h^-1) site The free dissolved fraction (<0.2 μm) accounted for the most APA (~50%), followed by the phytoplankton (>1 μm; 30%) and bacteria fraction (<0.2-> 1.2 μm; 8%). Thaiassia testudinum leaves with their associated epiphytes contributed modestly to water column APA (14 and 20%), and only during non-bloom conditions. Rapid hydrolysis of PMEs (undetected in most samplings) in Florida Bay is probably driven by high concentration of organic substrates for microbial and cyanobacterial activity which results from the close association of the shallow water column with the underlying seagrass community and adjacent Everglades wetlands.
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Date Issued
2007
PURL
http://purl.flvc.org/fau/fd/FA00000780
Subject Headings
Coastal ecology--Florida, Coastal zone management--Florida, Estuarine sediments--Florida--Florida Bay, Aquaculture--Environmental aspects--Florida
Format
Document (PDF)