Dispersion—Mississippi River Below Baton Rouge, La.

by Raul S. McQuivey, (M.ASCE), Vice Pres.; Water Resources Div., SUTRON, Inc., Arlington, Va.; formerly, Hydro., United States Geological Survey, Reston, Va.,
Thomas N. Keefer, (A.M.ASCE), Hydro.; United States Geological Survey, Bay St. Louis, Miss.,

Serial Information: Journal of the Hydraulics Division, 1976, Vol. 102, Issue 10, Pg. 1425-1437

Document Type: Journal Paper


Measurements of longitudinal dispersion and lateral and vertical mixing were made in the Mississippi River at a flow of 795,000 cfs (22,511 m³/s). The results show that the longitudinal dispersion coefficient for the 179-mile (287.8-km) reach from Baton Rouge to Point a la Hache, La., was approx 7,500 sq ft/sec (697 m²/s) or about 900 U*R, in which U* is the shear velocity and R is the hydraulic radius. Vertical mixing was accomplished in about 50 miles (80.4 km). A numerical model based on a particular solution of the convection equation was used to aid in data collection. The model provides an accurate simulation of the dispersion process over the entire length of the study reach.

Subject Headings: Rivers and streams | Flow measurement | Numerical models | Model accuracy | Streamflow | River flow | Shear stress | Fluid velocity | Baton Rouge | Louisiana | United States | Mississippi River

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