Use of processed geophysical data to improve the delineation of in‐filled scour holes at Bridge Piers

Delineation of tidal scour through marine geophysical techniques at Sloop Channel and Goose Creek bridges, Jones Beach State Park, Long Island, New York

“…Applications of this technique in bridge-scour studies have been described by Crumrine (1991), Brabets (1995), Bedingfield and Murphy (1987), Haeni and Gorin (1989), Gorin and Haeni (1989), Haeni and Placzek (1991), Placzek and others (1993), and Placzek and Haeni (1995). The continuous seismicreflection system used in this study consisted of a graphic recorder, an amplifier/filter, power generator, a tuned 3.5-to-7-kHz transducer, a digital audiotape recorder, and a shallow-draft 22-ft boat.…”

Surface-geophysical techniques used to detect existing and infilled scour holes near bridge piers

“…Continuous seismic-reflection profiling (CSP) and ground-penetrating radar (GPR) techniques have been used to evaluate scour holes near bridge piers Crumrine, 1991;Haeni and Placzek, 1991;Haeni and others, 1992;Placzek and others, 1993;Mueller and others, 1994). One study has shown that continuous seismic-reflection profiles could be used to determine quantitative material classification data (Hart and Caulfield, 1989).…”

“…The application of digital-signal processing (DSP) techniques to surface-geophysical and position data improved the interpretation of unprocessed geophysical records (Haeni and Placzek, 1991;Haeni and others, 1992). The application of DSP routines to geophysical data sets increased the accuracy and ease of the data interpretations.…”

“…For this study, positioned 200-kHz black-and-white Fathometer, 20-kHz color Fathometer, 14-kHz CSP, and 100-MHz GPR data were collected and processed in May and October of 1990 (Haeni and Placzek, 1991). In September 1991, unpositioned 1.5-to 10-kHz swept-frequency CSP data were collected, and the following month, a new 14-kHz transducer was used to collect positioned CSP data.…”

“…The positioned 14-kHz CSP data and 100-MHz GPR data, collected in May, also indicate 5 ft of fill material in the scour hole at pier 4. The CSP and GPR data were subsequently processed, which clarified the data interpretation (Haeni and Placzek, 1991).…”