An Analysis of the Functional Capabilities and Performance of Silt Curtains.
Abstract
Under quiescent conditions (where current velocities are less than 0.2 ft/sec) silt curtains that are properly deployed and maintained can effectively control the dispersion of turbid water in the upper part of the water column. Silt curtain effectiveness depends on the nature of the operation, the quantity and type of material in suspension, the characteristics and configuration of the silt curtain, the method of deployment, and the hydrodynamic conditions at the site. Under ideal conditions, turbidity levels in the water column outside the curtain can be as much as 80 to 90 percent lower than those levels inside or upstream of the curtain. When silt curtains are used to inclose open-water pipeline disposal operations, the vast majority (95 percent) of the dredged material slurry descends to the bottom of the disposal area where it forms a fluid mud layer. In most cases, the turbid water in the water column above the fluid mud layer will flow under the curtain along with the fluid mud layer on the bottom. As current velocities increase, the effective depth of the silt curtain is reduced due to flare, and associated turbulence may cause significant resuspension of the fluid mud layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA060382
Entities
People
- Edward E. Johanson