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RECORD NUMBER: 37 OF 147

OLS Field Name OLS Field Data
Main Title Erosion of Soft Cohesive Sediment Deposits.
Author Parchure, T. M. ; Mehta, A. J. ;
CORP Author Florida Univ., Gainesville. Dept. of Coastal and Oceanographic Engineering.;Environmental Research Lab., Athens, GA.
Publisher c1985
Year Published 1985
Report Number EPA-R-806684; EPA/600/J-85/529;
Stock Number PB89-103626
Additional Subjects Erosion ; Sediments ; Estuaries ; Hydraulic models ; Soil mechanics ; Shear stress ; Shear tests ; Flumes ; Bed load ; Density(Mass/volume) ; Profiles ; Channel flow ; Flushing ; Shear strength ; Consolidation ; Salinity ; Reprints ;
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NTIS  PB89-103626 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/14/1989
Collation 21p
Abstract
Erosion behavior of soft cohesive sediment deposits has been investigated in laboratory experiments. Such deposits are representative of the top, active layer of estuarial beds. An experimental procedure involving layer by layer erosion under a range of bed shear stresses, Tau sub b, of successively increasing magnitude was utilized. Interpretation of the resulting concentration-time data together with bed density profiles yielded a description of the variation of the bed shear strength, Tau sub s, with depth as well as an expression for the rate of surface erosion. In general, Tau sub s, increased with depth and also was influenced by the type of sediment, bed consolidation period and salinity. The rate of erosion was found to vary exponentially with (tau sub b-tau sub s)1/2. In modeling estuarial bed erosion, it is essential to take these characteristics of tau sub s and the rate of erosion into account.