Accession Number:

ADA422689

Title:

Ashtubula River, Ohio, Sedimentation Study. Report 3 Erosion Experiments on Bed Sediments

Descriptive Note:

Technical rept.

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS

Report Date:

1999-09-01

Pagination or Media Count:

49.0

Abstract:

Bed-sediment samples from the Ashtabula River in Ohio were subjected to stepwise 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 percent with clay content ranging from 15 to 30 percent. Scatter in the experimental erosion results did not appear to be related to sample location or other factors. Taken by device, the indicated threshold 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 reasonable threshold for erosion was 0.28 Pa. Mean erosion rate constant, or erosion rate at twice the threshold shear stress, was 7.2 gsq mmin.

Subject Categories:

  • Mechanics
  • Thermodynamics
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE