Magnitude and Frequency Analysis in Large Rivers

by David S. Biedenharn, US Army Corps of Engineers, Vicksburg, MS, USA,
Charles D. Little, US Army Corps of Engineers, Vicksburg, MS, USA,
Colin R. Thorne, US Army Corps of Engineers, Vicksburg, MS, USA,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A study of the magnitude and frequency of sediment transport was conducted on the Mississippi River at Natchez, MS, Red River at Alexandria, LA, and Pearl River at Bogalusa, LA. The individual flow increment transporting the most sediment was found to have a recurrence interval of slightly less than or equal to 1 year for all three rivers. It was found that over 80 percent of the long term sediment load was transported by flows with recurrence intervals of less than 3 years. The occurrence of extreme, but relatively infrequent, events had very little impact on these results. This suggests that the intermediate flows (less than 3 year recurrence interval for these three rivers) have the greatest influence on sediment transport and, therefore, on channel morphology.

Subject Headings: Frequency analysis | Rivers and streams | Streamflow | Channel flow | Sediment transport | Sediment loads | Load factors | Water supply systems | United States | Louisiana | Mississippi River | Mississippi

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