Environmental Geology and Water Sciences

, Volume 15, Issue 3, pp 189–198 | Cite as

Direct impacts of outer continental shelf activities on wetland loss in the central Gulf of Mexico

  • Robert H. Baumann
  • R. Eugene Turner

Abstract

The direct impacts of outer continental shelf (OCS) development on recent wetland loss in the northern Gulf of Mexico were quantified using aerial imagery, field surveys, and literature review. The total direct impacts accounted for an estimated 25.6 percent of total net wetland loss within the Louisiana portion of the study area from 1955/56 to 1978. Of the total direct impacts of 73,905 ha, OCS-related activities accounted for 11,589-13,631 ha of the wetland loss during the same time interval. Although this is a substantial areal loss, it represents only 4.0-4.7 percent of the total Louisiana wetland loss from 1955/56 to 1978, and 15.7–18.4 percent of direct impacts.

Direct impacts from OCS pipelines averaged 2.49 ha/km, lower than published guidelines, and totalled 12,012 ha. Lowest impacts are for backfilled pipelines in the Chenier Plain of western Louisiana and for small young pipelines built in clustered rights-of-way. Widening of OCS pipeline canals does not appear to be an important factor for total net wetland loss in the coastal zone because few pipelines are open to navigation and, for the examples found, the impact width was not significantly different than for open pipelines closed to navigation. Navigation channels account for a minimum of 16,902 ha of habitat change. Direct impacts per unit length of navigation channel average 20 times greater than pipelines.

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References Cited

  1. Boesch, D. R., and D. Levin, 1983, Subsidence in coastal Louisiana: causes, rates and effects on wetlands: U.S. Fish Wildlife Service, Biological Service Program, FWS/OBS 83/26. Washington, D.C. 30 p.Google Scholar
  2. Chabreck, R. H., and G. Linscombe, 1978, Vegetative type map of the Louisiana coastal marshes: Louisiana Department of Wildlife and Fisheries, New Orleans, LA.Google Scholar
  3. Cowardin, L. M., V. Carter, F. C. Golet, and E. T. LaRoe, 1979, Classification of wetlands and deepwater habitats of the United States: U.S. Fish and Wildlife Service, FWS/OBS-79/31. Washington, D.C. 103 p.Google Scholar
  4. Gosselink, J. G., C. L. Cordes, and J. W. Parsons, 1979, An ecological characterization study of the Chiener plain coastal ecosystem of Louisiana and Texas, Vol. II. Appendices: U.S. Fish and Wildlife Service, Office of Biological Services, FWS/OBS-78/10. Washington, D.C. 407 p.Google Scholar
  5. Hooks, D. D. (ed.), 1988, The ecology and management of wetlands: Portland, OR, Timber Press, 2 vols.Google Scholar
  6. Johnson, W. B., and J. G. Gosselink, 1982, Wetland loss directly associated with canal dredging in the Louisiana coastal zone;in D. F. Boesch (eds.). Proceedings of the conference on coastal erosion and wetland modification in Louisiana: causes, consequences and options: U.S. Fish and Wildlife Service, Biological Services Program, Washington, D.C. p. 60–72.Google Scholar
  7. Scaife, W. B., R. E. Turner, and R. Costanza, 1983, Recent land loss and canal impacts in coastal Louisiana: Environmental Management, v. 7, no. 5, p. 433–442.Google Scholar
  8. Tabberer, D. T., W. Hagg, M. Coquat, and C. L. Cordes, 1985, Pipeline impacts on wetland: final environmental assessment: U.S. Department of the Interior, Minerals Management Service, Metairie, LA. 41 p.Google Scholar
  9. Turner, R. E., and D. R. Cahoon (eds.), 1987, Causes of wetland loss in the coastal central Gulf of Mexico, 3 vols: Final report Minerals Management Service, New Orleans, LA. Contract No. 14-12-0001-30252. OCS Study/MMS 87-0119.Google Scholar
  10. Turner, R. E., R. Costanza, and W. Scaife, 1982, Canals and land loss in coastal Louisiana;in D. F. Boesch (ed.), Proceedings of the Conference on Coastal Erosion and Wetland Modification in Louisiana: causes, consequences and options: U.S. Fish and Wildlife Service, Biological Services Program, FWS/OBS-82/59. Washington, D.C. p. 73–84.Google Scholar
  11. U.S. Department of Interior, Minerals Management Service, 1983, Regional environmental assessment. Gulf of Mexico pipeline activities: Minerals Management Service, Metaire, LA. 175 p.Google Scholar
  12. Wicker, K. M., 1980, Mississippi deltaic plain region ecological characterization: a habitat mapping study. A user's guide to the habitat maps: U.S. Fish and Wildlife Service, Office of Biological Services, Slidell, LA. FWS/OBS-79/07.Google Scholar
  13. Wicker, K. M., 1981, Mississippi deltaic plain region ecological characterization: a habitat mapping study: U.S. Dept. Interior Biological Services Program FWS/OBSD-79/07. 45 p. + appendices.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • Robert H. Baumann
    • 1
  • R. Eugene Turner
    • 2
  1. 1.Center for Energy StudiesLouisiana State UniversityBaton RougeUSA
  2. 2.Coastal Ecology InstituteLouisiana State UniversityBaton RougeUSA

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