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Topographic and Bathymetric Survey in Support of the Effectiveness Assessment of the Living Shoreline Restoration in Gandys Beach, New Jersey

Open-File Report 2024-1072
Prepared in cooperation with the U.S. Fish and Wildlife Service and The Nature Conservancy
Prepared in collaboration with Northeastern University
By: , , , , , and 
https://doi.org/10.3133/ofr20241072

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Abstract

High resolution topobathymetric field surveys were conducted by the U.S. Geological Survey in collaboration with Northeastern University and in cooperation with the U.S. Fish and Wildlife Service and The Nature Conservancy in a selected shoreline along Gandys Beach, New Jersey, from January to April 2018. These data are a critical model input for hydrodynamic and wave models and can affect the accuracy of model outputs such as wave height, water surface elevation, current velocity, and sediment transport. Gandys Beach is a living shoreline where constructed oyster reefs (CORs) were built to protect the shoreline and enhance habitat for oyster and other species. Because of the complex topography and bathymetry of the study area, higher spatial resolution topobathymetric data are required to resolve the vertical variations near the CORs. During the field survey, the global navigation satellite system positioning method was used to establish the elevation of a benchmark referenced to the North American Vertical Datum of 1988. The topobathymetric data were collected using a total station. Horizontal accuracy of plus or minus 0.05 foot (ft) and vertical accuracy of plus or minus 0.10 ft were calculated using root mean square error between duplicate surveys. Two existing datasets were integrated with the survey data to create an updated topobathymetric dataset for model input and analysis: (1) the U.S. Geological Survey Coastal National Elevation Database 1-meter resolution data developed after Hurricane Sandy and (2) The Nature Conservancy 2017 elevation monitoring data at 10-meter resolution. A root mean square error analysis comparing survey data with the new topobathymetric dataset versus the survey data compared to the original Coastal National Elevation Data dataset showed errors of 0.31 and 2.61 ft, respectively. This improved dataset can be used for wave and hydrodynamic modeling in support of the effectiveness assessment of the CORs and living shoreline restoration along Gandys Beach.

Suggested Citation

Capurso, W.D., Niemoczynski, L.M., Wang, H., Chen, Q., Snedden, G., and Zhu, L., 2024, Topographic and bathymetric survey in support of the effectiveness assessment of the living shoreline restoration in Gandys Beach, New Jersey: U.S. Geological Survey Open-File Report 2024–1072, 15 p., https://doi.org/10.3133/ofr20241072.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Acknowledgments
  • Abstract
  • Introduction
  • Methods
  • Global Navigation Satellite System Survey
  • Results and Discussion
  • Summary
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Topographic and bathymetric survey in support of the effectiveness assessment of the living shoreline restoration in Gandys Beach, New Jersey
Series title Open-File Report
Series number 2024-1072
DOI 10.3133/ofr20241072
Year Published 2024
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Wetland and Aquatic Research Center
Description Report: viii, 15 p.; Data Release
Country United States
State New Jersey
Other Geospatial Gandys Beach
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details