Seismic Reflection And Resistivity Surveys To Map Sand Resources For New Jersey Beach Nourishment Projects

The New Jersey Geological Survey (NJGS) maps the State’s offshore geology and sand deposits by acquiring, analyzing and interpreting marine geologic and geophysical data. These data support development of a regional geologic framework that characterizes offshore sediment distribution. This framework produces a statewide assessment of offshore sand resources for beach nourishment, supports the NJGS geologic mapping program and is essential for a science-based approach to long-term resource management and contingency planning. The NJGS conducts surveys using seismic reflection methods and marine DC electrical resistivity. Geophysical data is ground-truthed with sediment vibracores. Analyses include grain size distribution, calculated interval velocity, conventional radiocarbon and amino-acid racemization (AAR) dating of sediment samples, and seismic stratigraphy. Delineating sand resources using a geologic framework permits the NJGS to identify areas strategically, obtaining detailed information where the resource potential is greatest for the least cost. This methodology enables a comprehensive assessment of sand location, quality and volume. NJGS has identified more than 274 million cubic meters (358 million cubic yards) of sand in both State and Federal waters along New Jersey's 127 miles of coastline. Data and findings are shared with the U.S. Army Corps of Engineers (USACE), NJ Department of Environmental Protection, and U.S. Department of Interior Minerals Management Service.