U.S. GEOLOGICAL SURVEY
Water-Resources
Investigations Report 00-4033
Delineation of Tidal Scour through Marine
Geophysical Techniques at Sloop Channel and
Goose Creek Bridges, Jones Beach State Park,
Long Island, New York
By Frederick Stumm, Anthony Chu, and Richard J. Reynolds
CONTENTS
Abstract
Introduction
Purpose and scope
Location of study area
Acknowledgments
Methods of study
Narrow-beam fathometer surveys
Continuous seismic-reflection surveys
Acoustic Doppler current profiler
Delineation of tidal scour at Sloop Channel and Goose Creek Bridges
Sloop Channel Bridge
Fathometer survey
Seismic-reflection profiles
Piers 1 and 2
Piers 4 and 5
Piers 6 and 7
Piers 9 and 10
Discharge measurement
Goose Creek Bridge
Fathometer survey
Seismic-reflection profiles
Centerspan
Piers 5 and 6
Piers 2 and 3
Piers 1 and 2
Summary and conclusions
References cited
FIGURES
1. Maps showing location of Sloop Channel Bridge and Goose Creek Bridge study area, and of tide-stage gage,
Nassau County, N.Y. A. General location. B. Study area
2. Generalized sketches showing pier-numbering systems for piers during July 1998 seismic-reflection survey,
Nassau County, N.Y. A. Goose Creek Bridge. B. Sloop Channel Bridge
3. Map showing sea-floor elevation at Sloop Channel Bridge, Nassau County, N.Y., July 1998
4. Narrow-beam fathometer profiles between piers 2 and 3 at Sloop Channel Bridge, Nassau County, N.Y.,
July 1998
5-8. Interpreted high-frequency seismic-reflection profiles at Sloop Channel Bridge, Nassau County, N.Y., July 1998:
5. Between piers 1 and 2
6. Between piers 4 and 5
7. Between piers 6 and 7
8. Between piers 9 and 10
9. Acoustic Doppler current profiler (ADCP) velocity profiles between piers 9 and 10 during flood tide at Sloop
Channel Bridge, Nassau County, N.Y. A. East-west velocity. B. Vertical velocity
10. Bathymetric contour map of the sea floor at Goose Creek Bridge, Nassau County, N.Y., July 1998
11-14. Interpreted high-frequency seismic-reflection profiles at Goose Creek Bridge, Nassau County, N.Y., July 1998:
11. Between centerspans
12. Between piers 5 and 6
13. Between piers 2 and 3
14. Between piers 1 and 2
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