Accession Number:

ADA229640

Title:

Land Loss Rates. Report 2. Louisiana Chenier Plain

Descriptive Note:

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Report Date:

1990-11-01

Pagination or Media Count:

38.0

Abstract:

Land loss mapping and rate curve development for 12 US Geological Survey topographic quadrangles in the Louisiana Chenier Plain indicate that the magnitude and trend in land loss rates are highly variable. Two of the quadrangles show an increase in the land loss rate when comparing the middle period 1950s to 1974 to the most recent period 1974 to 1983. Three quadrangles have a constant rate. In seven quadrangles, the rate is decreasing. Differences in land loss rates are a function of the geologic setting and factors such as subsidence, storm-induced erosion, channelization of rivers and streams, and canal dredging. Land loss rates for the entire plain are presently decreasing from the high estimated to have occurred during the early 1970s. Average land loss rate as of 1983 is 7.74 sq miyear. On a regional scale, land loss rate for the entire Mississippi River Deltaic and Chenier Plains is decreasing showing an average land loss rate of 30.71 sq miyear. At its peak, in the early 1970s, the average land loss rate was 41.88 sq miyear. Another data point is necessary to determine whether this decrease is continuing. mm

Subject Categories:

  • Cartography and Aerial Photography
  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE