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  • Articles  (3)
  • Wetlands
  • sediment
  • 1980-1984  (3)
  • Energy, Environment Protection, Nuclear Power Engineering  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 7 (1983), S. 443-452 
    ISSN: 1432-1009
    Keywords: Salt marshes ; Wetlands ; Wetland management ; Wetland boundaries ; Coastal vegetation ; Coastal ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Legislation mandating the protection of wetlands, combined with current pressures to convert them to other uses, emphasize the need to determine accurately a wetland-upland boundary We investigated six methods designed to establish such a boundary based on vegetation Each method was applied to a common data set obtained from 295 quadrats along 22 transects between marsh and upland areas in 13 intertidal saline wetlands in Oregon and Washington. The multiple occurrence, joint occurrence, and five percent methods required plant species to be classified as salt marsh, upland, and non-indicator, cluster and similarity methods required no initial classification Close agreement on wetland-upland boundaries determined by the six methods suggests that preclassification of plants and collection of plant cover data may not be necessary to determine the boundary
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 7 (1983), S. 433-442 
    ISSN: 1432-1009
    Keywords: Coastal zone management ; Wetlands ; Canals ; Marshes ; Louisiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Annual coastal land loss in the sedimentary deltaic plain of southern Louisiana is 102 km2, which is correlated with man-made canal surface area. The relationships between land loss and canals are both direct and indirect and are modified by the deltaic substrate, distance to the coast, and availability of new sediments. Loss rates are highest in the youngest of the former deltas nearest the coast; they are lowest in the more consolidated sediments far from the coast. The average estimate for land loss at zero canal density in the six regression equations developed was 0.09%±0.13% annually, the present land loss rates approach 0 8% annually Although additional analyses are needed, we conclude that canals are causally related to a significant portion of the total coastal land loss rates The relation probably involves an interruption of local and regional hydrologic regimes. Reduction of the present acceleration in land loss rates is possible by managing present canals more effectively, by not permitting new ones, and by changing the design of new canals to allow more natural water flow
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 7 (1983), S. 339-344 
    ISSN: 1432-1009
    Keywords: Wetlands ; Mapping ; Coastal zone management ; Wetlands regulation ; Remote sensing ; Delaware
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Coastal wetlands are dynamic ecosystems subject to the manipulative powers of both humans and sea. Areal changes in the tidal wetlands of Delaware were monitored over a six year period with color and color infrared aerial photography. Wetland changes were interpreted directly from the photography and were classified according to natural and legal categories of change. Human activities in tidal wetlands destroyed an average 8.1 ha of wetlands annually from 1973 to 1979. During the same period 3.9 ha of wetlands were eroded and 2.8 ha of wetlands were formed annually by natural processes. A total net loss of 55.1 ha of wetlands was estimated for the six year period. The enactment of state and federal legislation protecting wetlands in 1972–1973 resulted in a decrease of wetlands loss in Delaware from an average of 179.7 ha yr−1 from 1954 to 1971 to the 8.1 ha yr−1 determined by this study. The dynamic nature of these wetlands exemplifies the need for frequent monitoring and remapping, if an effective and accurate management program is to remain in operation
    Type of Medium: Electronic Resource
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