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St. Petersburg Coastal and Marine Science Center

Data Release

Archive of Chirp Subbottom Profile Data Collected in 2017 From the Northern Chandeleur Islands, Louisiana

By Arnell S. Forde, Nancy T. DeWitt, Jake J. Fredericks, and Jennifer L. Miselis

Summary

As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore geophysical survey around the northern Chandeleur Islands, Louisiana, in August of 2017. The objective of the project is to improve the understanding of barrier island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1–5 years). Collecting geophysical data can help researchers to identify relationships between the geologic history of the island and its present-day morphology and sediment distribution. High-resolution geophysical data collected along this rapidly changing barrier island system can provide a unique time-series dataset to further the analyses and geomorphological interpretations of this and other coastal systems, improving researchers understanding of coastal response and evolution over medium-term time scales (months to years).

This data release serves as an archive of subbottom profile and navigation data collected in August 2017 offshore of the northern Chandeleur Islands, during USGS Field Activity Number 2017-337-FA. Data products, including unprocessed digital chirp subbottom data, trackline map, navigation files, processed profile images, geographic information system (GIS) files and formal Federal Geographic Data Committee (FGDC) metadata, and field logs are provided. For additional information regarding data acquisition and processing methods, refer to USGS Data Series 1077.

Data

File Name and Description Metadata (XML format) Metadata (text format) Download File
2017-337-FA_segy.zip
Unprocessed digital chirp subbottom trace data (.sgy)
2017-337-FA_metadata.xml 2017-337-FA_metadata.txt 2017-337-FA_segy.zip
(1.69 GB)
2017-337-FA_nav.zip
Navigation data (.txt)
Same as above Same as above 2017-337-FA_nav.zip
(4.3 MB)
2017-337-FA_seisimag.zip
Processed subbottom profile images (.gif)
Same as above Same as above 2017-337-FA_seisimag.zip
(22.7 MB)
2017-337-FA_arc.zip
Survey trackline locations (.mxd, .shp)
Same as above Same as above 2017-337-FA_arc.zip
(24 MB)
Supplemental Information
2017-337-FA_logs.zip
Field Activity Collection System (FACS), acquisition geometry and geophysical operations logs (.pdf)
Not applicable Not applicable 2017-337-FA_logs.zip
(490 KB)

 Map of northern Chandeleur Islands showing the August 2017 survey tracklines, with inset of regional location map.
Figure 1. Regional map showing the August 2017 survey area (indicated by red box) and trackline locations. The northern Chandeleur Islands, Louisiana, land area was derived from USGS lidar data collected in 2016.

Suggested Citation

Forde, A.S., DeWitt, N.T., Fredericks, J.J., and Miselis, J.L., 2018, Archive of chirp subbottom profile data collected in 2017 from the northern Chandeleur Islands, Louisiana: U.S. Geological Survey data release, https://doi.org/10.5066/P9E8VRGO.



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