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|Title:||Ashtabula River, Ohio, sedimentation study. Report 3, Erosion experiments on bed sediments|
|Authors:||Teeter, Allen M.|
Parman, Joe W.
Coleman, Clara J.
|Publisher:||Coastal and Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report CHL ; 99-9 rept. 3.|
Bed-sediment samples from the Ashtabula River in Ohio were subjected to step wise increasing shear stresses to assess erodibility. Ten erosion experiments were performed in an oscillating-screen erosion chamber, and five experiments were performed in a water tunnel. Imposed shear stress ranged from 0.2 to 2.33 Pa. Sediments were characterized by grain size, density, pH, moisture content, loss on ignition, and rheological behavior. Sediments were mostly silt (42-72 per cent) with clay content ranging from 15 to 30 per cent. Scatter in the experimental erosion results did not appear to be related to sample location or other factors. Taken by device, the indicated thresh old for erosion was 0.34 Pa for the oscillating-screen erosion chamber and 0.8 Pa for the water tunnel. Taking all tests together, a reason able thresh old for erosion was 0.28 Pa. Mean erosion rate constant, or erosion rate at twice the thresh old shear stress, was 7.2 g/sq m/min.
|Appears in Collections:||Technical Report|