Wave generated bedforms in the near-shore sand environment


UFDC Home	myUFDC Home \| Help \| RSS

TABLE OF CONTENTS

HIDE

	Front Cover
	Title Page
	Acknowledgement
	Table of Contents
	List of Tables
	List of Figures
	List of symbols
	Abstract
	Introduction
	Previous work
	Multiple transducer array
	Field measurements of bedforms...
	Observations of bedform dynami...
	Discussion and conclusions
	Appendix A: SIS95 and SIS96 data...
	Appendix B: SIS95 and SIS96 programs...
	References
	Biographical sketch

	Group Title:	UFL/COEL-TR ;, 115
	Title:	Wave generated bedforms in the near-shore sand environment

CITATION

PAGE IMAGE

ZOOMABLE

Full Citation

STANDARD VIEW

MARC VIEW


	Permanent Link:	http://ufdc.ufl.edu/UF00075478/00001

Material Information
	Title:	Wave generated bedforms in the near-shore sand environment
	Series Title:	UFLCOEL
	Physical Description:	xii, 132 leaves : ill. ; 29 cm.
	Language:	English
	Creator:	Jettâe, Christopher D., 1969- ( Dissertant ) Hanes, Daniel M. ( Thesis advisor ) Dean, Robert G. ( Reviewer ) Mossa, Joann ( Reviewer ) Sheppard, Donald M. ( Reviewer ) Thicke, Robert J. ( Reviewer ) University of Florida -- Coastal and Oceanographic Engineering Dept
	Publisher:	Coastal & Oceanographic Engineering Dept., University of Florida
	Place of Publication:	Gainesville Fla
	Publication Date:	1997
	Copyright Date:	1997

Subjects
	Subjects / Keywords:	Sand waves ( lcsh ) Ocean bottom ( lcsh ) Marine sediments ( lcsh ) Coastal and Oceanographic Engineering thesis, Ph. D ( local ) Dissertations, Academic -- Coastal and Oceanographic Engineering -- UF ( local )
	Genre:	bibliography ( marcgt ) theses ( marcgt ) non-fiction ( marcgt )

Notes
	Abstract:	To measure bedform geometry, a high-resolution sea-bed profiling system has been developed. The multiple transducer array (MTA) consists of an array of ultra-sonic (5MHz) transducers. The first prototype MTA described herein measures two-dimensional bedform profiles over a length of 45 cm. Under ideal conditions, the instrument is capable of 1 mm vertical resolution and 2 cm horizontal resolution. Laboratory and field tests of the MTA show the system’s capability to accurately measure bedforms of known geometry and the ability to work under conditions with relatively high suspended sediment concentrations. Previous high-resolution profiling systems have either had moving parts, or have been unable to obtain the resolution of the system described herein. A multiple transducer array (MTA) was used to measure seabed geometry in a near-shore wave dominated environment in Duck, NC. The instruments were developed using a sensor insertion system (SIS) installed on the research pier. Bedforms were measured under a variety of wave conditions and at several cross-shore locations. Two existing empirical ripple prediction models are compared to the measured field data. A new model is also empirically determined from these measurements. This new model describes vortex ripple geometry strictly in terms of sediment and flow conditions and does not require the calculation of shear stress. When all available field measurements of small scale ripples are compared to these predictive models, the new model has lower errors in predicting ripple height, steepness, and length than any of the other models. Both small scale ripples with lengths of less than 40 cm, and large scale megaripples were measured during this experiment. Observations indicate that ripple flattening and reformation is a function of wave mobility number. Ripple reformation was commonly observed to occur in less than one minute after flattening and under certain conditions reformation was observed to occur within a few wave periods. Observations of megaripple migration indicate that cross-shore sediment transport due to ripple migration may be a significant process. Estimated cross-shore bed load transport rates are a good indicator of small scale ripple migration direction. Measurements indicate that megaripple lengths are proportional to near-bed orbital diameter, and that these types of bedforms can exist at small and large values of mobility number and orbital diameter.
	Thesis:	Thesis (Ph. D.)--University of Florida, 1997.
	Bibliography:	Includes bibliographical references (leaves 129-131).
	Statement of Responsibility:	by Christopher D. Jettâe.
	Funding:	This publication is being made available as part of the report series written by the faculty, staff, and students of the Coastal and Oceanographic Program of the Department of Civil and Coastal Engineering.

Record Information
	Bibliographic ID:	UF00075478
	Volume ID:	VID00001
	Source Institution:	University of Florida
	Holding Location:	University of Florida
	Rights Management:	All rights reserved, Board of Trustees of the University of Florida
	Resource Identifier:	oclc - 41567372

Table of Contents

Front Cover
Front Cover
Title Page
Title Page
Acknowledgement
Acknowledgement
Table of Contents
Table of Contents 1
Table of Contents 2
List of Tables
List of Tables
List of Figures
List of Figures 1
List of Figures 2
List of Figures 3
List of symbols
Unnumbered ( 10 )
Unnumbered ( 11 )
Abstract
Abstract 1
Abstract 2
Introduction
Page 1
Page 2
Page 3
Previous work
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Multiple transducer array
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Field measurements of bedforms and a comparison of prediction techniques
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Observations of bedform dynamics
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Discussion and conclusions
Page 89
Page 90
Page 91
Page 92
Appendix A: SIS95 and SIS96 data and plots
Page 93
Page 94
Page 95
Page 96
Page 97
Appendix B: SIS95 and SIS96 programs and data file descriptions
Page 98
Page 99
Page 100
Page 101
Page 102
Page 103
Page 104
Page 105
Page 106
Page 107
Page 108
Page 109
Page 110
Page 111
Page 112
Page 113
Page 114
Page 115
Page 116
Page 117
Page 118
Page 119
Page 120
Page 121
Page 122
Page 123
Page 124
Page 125
Page 126
Page 127
Page 128
References
Page 129
Page 130
Page 131
Biographical sketch
Page 132

© 2004 - 2010 University of Florida George A. Smathers Libraries.
All rights reserved.
Acceptable Use, Copyright, and Disclaimer Statement
Last updated October 10, 2010 - Version 2.9.9 - mvs

TRACE ROUTE

Total Execution Time: 64 Milliseconds

MILLISECOND	CLASS.METHOD	MESSAGE
0	sobekcm_page_globals.constructor
0	sobekcm_page_globals.constructor	Application State validated or built
0	sobekcm_database.verify_item_lookup_object
0	sobekcm_page_globals.constructor	Navigation Object created from URI query string
0	sobekcm_database.verify_item_lookup_object
0	sobekcm_page_globals.display_item	Retrieving item or group information
0	sobekcm_page_globals.get_entire_collection_hierarchy	Retrieving hierarchy information
0	sobekcm_assistant.get_entire_collection_hierarchy
0	cached_data_manager.retrieve_item_aggregation
0	cached_data_manager.retrieve_item_aggregation	Found item aggregation on local cache
0	item_aggregation_builder.get_item_aggregation	Found 'all' item aggregation in cache
0	system.web.ui.page.page_load (ufdc.page_load)
0	sobekcm_page_globals.constructor.on_page_load
0	html_echo_mainwriter.add_style_references	Adding style references to HTML
0	html_echo_mainwriter.add_text_to_page	Reading the text from the file and echoing back to the output stream
64	html_echo_mainwriter.add_text_to_page	Finished reading and writing the file