Convective Model of Longitudinal Dispersion

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

Serial Information: Journal of the Hydraulics Division, 1976, Vol. 102, Issue 10, Pg. 1409-1424

Document Type: Journal Paper


Longitudinal dispersion can be successfully modeled as a purely convective linear process for approximately one-sixth of the time required to reach the diffusive period. A system-response function developed from the log-law velocity profile may be used up to this limit. The remaining five-sixths of the convective period is modeled as a chain of linear convective systems. Data sets from four flume tests and three natural rivers are used to verify the use of the convective response function. Excellent results are obtained in all cases.

Subject Headings: Linear functions | Diffusion | Velocity profile | Hydrologic data | Flumes | Rivers and streams | Verification

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