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Natural and anthropogenic influences on flow patterns and sediment characteristics in the Dona and Roberts Bay Estuarine...

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Material Information

Title:
Natural and anthropogenic influences on flow patterns and sediment characteristics in the Dona and Roberts Bay Estuarine System, Sarasota County, Florida
Physical Description:
Book
Language:
English
Creator:
Kelso, Kyle W
Publisher:
University of South Florida
Place of Publication:
Tampa, Fla.
Publication Date:

Subjects

Subjects / Keywords:
Mangroves
Estuary
Oysters
Sedimentation
Stratigraphy
Vibracore
Dissertations, Academic -- Geology -- Masters -- USF   ( lcsh )
Genre:
bibliography   ( marcgt )
theses   ( marcgt )
non-fiction   ( marcgt )

Notes

Summary:
ABSTRACT: The Dona and Roberts Bay watershed comprises one of the five major watersheds in Sarasota County, Florida. It is connected to the Gulf of Mexico via Venice Inlet. Like many estuaries in the Florida, significant modifications have been made to the drainage basins, principally to the main tributaries. The system has undergone several anthropogenic modifications to enhance water management efforts. Creeks that comprise fresh water input into the system have been dammed in order to inhibit the upstream flow of salt water during the dry season. They are also deepened or lengthened to allow for better drainage. In addition, biogenic activity has also had morphological effects on the system. There are numerous oyster bars, and mangrove forests that impose obstruction to the tidal and river flows. This has resulted in a highly complicated estuary system in terms of flow velocities and sedimentation patterns.The objectives of this study are to quantify the sediment characteristics and deposition-erosion trends and their relationship to flow patterns and other natural and anthropogenic factors within the system. A detailed sedimentary analysis was conducted based on 149 surface sediment samples and 29 drill cores. Spatial distribution of the sediment properties is quite complex, controlled by several interactive factors including; local sediment supply, intensity of the hydrodynamic processes, distribution of oyster bars and mangrove islands, and artificial structures. Sedimentation and erosion is significantly influenced by flood events. In some locations, such as the mouth of the fluvial channels, or the confluence of two creeks, the core data suggest that rapid sedimentation, driven by flood events, is responsible for the development of some of the large shoals. A 2-D depth-averaged circulation model was established for the study area.Many of the natural structures and artificial modifications to the watershed system are incorporated into the model. A close relationship between the flow intensity and sediment characteristics, and therefore, sedimentation-erosion tendency is identified. Remotely sensed data is also incorporated into the study in order to gain an understanding of the development of the estuary system over a ten-year period. Data suggests that the maturation of biogenic organisms that inhabit the system coincides with the development of complex sedimentation patterns.
Thesis:
Thesis (M.S.)--University of South Florida, 2007.
Bibliography:
Includes bibliographical references.
System Details:
System requirements: World Wide Web browser and PDF reader.
System Details:
Mode of access: World Wide Web.
Statement of Responsibility:
by Kyle W. Kelso.
General Note:
Title from PDF of title page.
General Note:
Document formatted into pages; contains 135 pages.

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 001920969
oclc - 190791178
usfldc doi - E14-SFE0002126
usfldc handle - e14.2126
System ID:
SFS0026444:00001


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Full Text

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Natural and Anthropogenic Influences on Flow Patterns and Sediment Characteristics in the Dona and Roberts Bay Estuarine System, Sarasota County, Florida by Kyle W. Kelso A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Department of Geology College of Arts and Sciences University of South Florida Major Professor: Ping Wang, Ph.D. Mark C. Rains, Ph.D. Ernest Estevez, Ph.D. Date of Approval: July 16, 2007 Keywords: mangroves, estuary, oysters, sedimentation, stratigraphy, vibracore Copyright 2007 Kyle W. Kelso

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Acknowledgments I would first like to thank every member of the University of South Florida Coastal Research Laboratory for their help and support. Many long days were spent in the field collecting data, and even more time in the lab analyzing samples. Without your help I think I would still be pe rforming grain size analysis. I would also like to thank the members of my committee. To Dr. Mark Rains, thank you for you guidance and incite, you had a big part in my decision to attend the University of South Florida, for that I am ve ry grateful. To Dr. Ernie Estevez, thank you for your helpful comments and motivation. To my major professor, Dr. Ping Wang, thank you for everything you have done for me. Your financial support, your perseverance to ensure success, and most of all your friendship is greatly appreciated. Finally, thanks to my family for your support. To my mother and father, Joann and Jack Kelso, thank you for your encouragement and inspiration. To my fiance, Sonya, whose love and support kept my goals in sight, without you th is would not have been possible.

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Appendix I. (continued) 99

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Appendix II. Suburface Sediment Sample Analysis Appendix II contains the analysis of the subsurface sediment samples collected from the 29 cores obtained from the Dona and Roberts Bay estuarine system. Three to Five samples were collected at various de pths from sediment cores acquired from the system. The depth the samples were collected fo rm were selected according to lithologic variation. The location of the co res is displayed in latitude and longitude. Percent gravel, sand, and mud contained in the sample are incl uded in the tables, as well as, mean grain size, standard deviation, skewness and kurtosis. 103

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Appendix II. (continued) 104

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Appendix II. (continued) 105

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Appendix III. Core Photos with Lithologic Descriptions Appendix III contains the photos and descriptions of the cores obtained from the various regions within the Dona and Robert s Bay estuarine system. The photos contained in the core logs were acquired by blending several individual photos, with an average viewing area of 40 cm, into one complete core using a program known as Panorama Factory. This was done in order to retain the detail of the core for future reference. The length of the cores is displayed with comp action taken into consideration. Compaction varies depending on the lithology of the core. Lithologic variance is displayed including; color, sediment grain size, physical structures, bioturbation, organic content, and marine fossil content. The red lines, with corresponding depths, indi cate where sediment samples were taken for grain size analysis. 106

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Kelso, Kyle W.
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Natural and anthropogenic influences on flow patterns and sediment characteristics in the Dona and Roberts Bay Estuarine System, Sarasota County, Florida
h [electronic resource] /
by Kyle W. Kelso.
260
[Tampa, Fla.] :
b University of South Florida,
2007.
520
ABSTRACT: The Dona and Roberts Bay watershed comprises one of the five major watersheds in Sarasota County, Florida. It is connected to the Gulf of Mexico via Venice Inlet. Like many estuaries in the Florida, significant modifications have been made to the drainage basins, principally to the main tributaries. The system has undergone several anthropogenic modifications to enhance water management efforts. Creeks that comprise fresh water input into the system have been dammed in order to inhibit the upstream flow of salt water during the dry season. They are also deepened or lengthened to allow for better drainage. In addition, biogenic activity has also had morphological effects on the system. There are numerous oyster bars, and mangrove forests that impose obstruction to the tidal and river flows. This has resulted in a highly complicated estuary system in terms of flow velocities and sedimentation patterns.The objectives of this study are to quantify the sediment characteristics and deposition-erosion trends and their relationship to flow patterns and other natural and anthropogenic factors within the system. A detailed sedimentary analysis was conducted based on 149 surface sediment samples and 29 drill cores. Spatial distribution of the sediment properties is quite complex, controlled by several interactive factors including; local sediment supply, intensity of the hydrodynamic processes, distribution of oyster bars and mangrove islands, and artificial structures. Sedimentation and erosion is significantly influenced by flood events. In some locations, such as the mouth of the fluvial channels, or the confluence of two creeks, the core data suggest that rapid sedimentation, driven by flood events, is responsible for the development of some of the large shoals. A 2-D depth-averaged circulation model was established for the study area.Many of the natural structures and artificial modifications to the watershed system are incorporated into the model. A close relationship between the flow intensity and sediment characteristics, and therefore, sedimentation-erosion tendency is identified. Remotely sensed data is also incorporated into the study in order to gain an understanding of the development of the estuary system over a ten-year period. Data suggests that the maturation of biogenic organisms that inhabit the system coincides with the development of complex sedimentation patterns.
502
Thesis (M.S.)--University of South Florida, 2007.
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Includes bibliographical references.
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Text (Electronic thesis) in PDF format.
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System requirements: World Wide Web browser and PDF reader.
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Title from PDF of title page.
Document formatted into pages; contains 135 pages.
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Advisor: Ping Wang Ph.D.
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Mangroves.
Estuary.
Oysters.
Sedimentation.
Stratigraphy.
Vibracore.
690
Dissertations, Academic
z USF
x Geology
Masters.
773
t USF Electronic Theses and Dissertations.
4 856
u http://digital.lib.usf.edu/?e14.2126