Accession Number : ADA477898


Title :   Restoration of Delta Streams: A Case History and Conceptual Model


Corporate Author : ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB


Personal Author(s) : Killgore, K J ; Hoover, Jan J ; Murphy, Catherine E ; Parrish, Kent D ; Johnson, David R ; Myers, Karen F


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a477898.pdf


Report Date : Feb 2008


Pagination or Media Count : 20


Abstract : Delta streams, forming in the floodplains of large river systems, are widespread throughout the United States. Delta streams are most prevalent in the Mississippi Embayment, also referred to as the lower Mississippi River Basin. The alluvial flood-plain deposits are typically rich in organic material. Consequently, most delta streams have been altered through intense agricultural activities and flood control measures. Low water, excessive sedimentation in smaller delta streams, and the accumulation of pesticides such as DDT are the consequences of these anthropogenic disturbances resulting in dominance of tolerant fish species. Characteristics of tolerant fish assemblages include adaptations to low dissolved oxygen and high pulses of suspended solids, no direct requirements for clean, firm substrates for spawning, and ability to live in shallow, slackwater pools for extended periods. Although degraded delta streams are prevalent in the United States, attempts have been made to restore habitat conditions as part of ecosystem restoration or mitigation of flood control projects.


Descriptors :   *BASINS(GEOGRAPHIC) , *FLOOD PLAINS , *DELTAS , UNITED STATES , MODELS , WATER , INTENSITY , ALLUVIUM , OXYGEN , DEPOSITS , CASE STUDIES , ORGANIC MATERIALS , DISPERSIONS , FLOOD CONTROL , STREAMS , FISHES , DISSOLVING , HISTORY , TOLERANCE , RIVERS , FLOODS , HABITATS , MISSISSIPPI RIVER , AGRICULTURE


Subject Categories : Geography
      Hydrology, Limnology and Potamology


Distribution Statement : APPROVED FOR PUBLIC RELEASE