Analysis of shoreline and geomorphic change for Breton Island, Louisiana, from 1869 to 2014

Open-File Report 2016-1039
By: , and 

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Abstract

Many barrier islands in the United States are eroding and losing elevation substantively because of storm surge, waves, and sea-level changes. This is particularly true for the deltaic barrier system in Louisiana. Breton Island is near the mouth of the Mississippi River at the southern end of the Chandeleur barrier island chain in southeast Louisiana. This report expands on previous geomorphic studies of Breton Island by incorporating additional historic and recent datasets. Multiple analyses focus on longand short-term shoreline change, as well as episodic events and anthropogenic modification. Analyses periods include long term (1869–2014), long-term historic (1869–1950), post-Mississippi River-Gulf Outlet (1950–2014), pre/post-Hurricane Katrina (2004–5), and recent (2005–14). In addition to shoreline change, barrier island geomorphology is evaluated using island area, elevation, and sediment volume change. In the long term (1869–2014), Breton Island was affected by landward transgression, island narrowing, and elevation loss. Major storm events exacerbated the long-term trends. In the recent period (2005–14), Breton Island eroded at a slower rate than in the long-term and gained area and total sediment volume. The recent accretion is likely because of the lack of major storms since Hurricane Katrina in 2005.

Suggested Citation

Terrano, J.F., Flocks, J.G., and Smith, K.E.L., 2016, Analysis of shoreline and geomorphic change for Breton Island, Louisiana, from 1869 to 2014: U.S. Geological Survey Open-File Report 2016–1039, 34 p., http://dx.doi.org/10.3133/ofr20161039.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Acknowledgments
  • Abstract
  • Introduction
  • Methods
  • Results and Discussion
  • Conclusion
  • References Cited

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Analysis of shoreline and geomorphic change for Breton Island, Louisiana, from 1869 to 2014
Series title Open-File Report
Series number 2016-1039
DOI 10.3133/ofr20161039
Year Published 2016
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) St. Petersburg Coastal and Marine Science Center
Description Report: viii, 34 p.; Data Releases
Country United States
State Louisiana
Other Geospatial Breton Island, Breton National Wildlife Refuge, Chandeleur barrier island chain
Online Only (Y/N) Y
Additional Online Files (Y/N) Y