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Summary for Field Activity Number 2006-015-FA

Area of Operations: Chandeleur Islands, Chandeleur Sound, Louisiana, United States, Gulf of Mexico, North America, North Atlantic

Dates: July 06, 2006 to July 18, 2006

Objectives: The objectives of this cruise were to map the sea floor and shallow stratigraphy along the offshore side of the Chandeleur Islands off the eastern side of the Mississippi delta. This survey was done in collaboration with the USGS (St. Petersburg) and the Univ. of New Orleans who conducted geophysical surveys closer to shore than could be reached aboard the ACADIANA and along the back of the Chandeleur Islands. The reason for the mapping was to assess the effect of Hurricane Katrina on the sea floor surrounding these islands.

Type of Activity: Sea floor mapping

Information to be derived: Sea Floor Map
Bathymetric Maps
Morphology

Summary: The Chandeleur Islands were severely damaged by Hurricanes Katrina and Rita, and the goal of this cruise was to map the inner shelf offshore of the northern part of the island chain to assess the impact of these hurricanes on the inner shelf. The survey covered an area approximately 5 km wide by 46 km long that started in water depths as shallow as 4.5m and ended in water depths reaching 16 m. A series of shore parallel lines spaced approximately 150 m apart were complimented with a set of on/offshore lines spaced about 1 km apart. Sidescan sonar imagery, interferometric bathymetry and Chirp sub-bottom profiles were collected along all survey lines. The shore-parallel lines were spaced to provide continuous sidescan sonar coverage, and about 50% bathymetric coverage. All data were logged digitally and were archived to DVD-ROM prior to the end of the cruise. Geophysical and navigation data were collected along 1877 km of survey lines.

USGS Project Number: 2921-CJP60 - Project Description

Contact: Dave Twichell (dtwichell@usgs.gov)

InfoBank: uses the identifier A-1-06-GM. Visit this site for more information.

Map for Area of Operations :

Map of field activity boundary.

Platform Info:

The following materials for this field activity are available in the Information Archives:

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