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|Title:||Magnitude-frequency analysis of sediment transport in the lower Mississippi River|
|Authors:||United States. Army. Corp of Engineers. Vicksburg District.|
University of Nottingham.
Biedenharn, David S.
Little, Charles D., 1946-
Thorne, C. R. (Colin R.)
|Publisher:||Coastal and Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; CHL-99-2.|
Magnitude-frequency analysis of gauging station records (1950-1982) on the Lower Mississippi shows that there is a clearly defined dominant flow of about 30,000 m3/s. This lies within an effective range of channel-forming flows between 17,000 and 40,000 m3/s, which are responsible for transporting a disproportionately large percentage of the sediment load. The 33-year period of record is sufficiently long that the occurrence of an extreme high-flow event does not significantly change these results. Hydrographic survey data, long-profile records, and stage-discharge relationships from calibrated one-dimensional flow models indicate that the dominant discharge corresponds to “bar-full” discharge on the Lower Mississippi and that the effective range of flows occurs between the stage that just tops mid-channel bars and that which significantly overtops the bank. Historical trends in bar growth suggest that bar-top elevations have generally risen to the dominant flow elevation over the last 30 years.
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