TURBIDITY - SEDIMENTATION IN CLOSED-END CHANNELS

Chung-Po Lin, Jonathon W. Lott, Ashish J. Mehta

Abstract


In order to investigate the mechanism by which turbidity currents cause sedimentation in closed-end channels such as pier slips or residential canals, a laboratory investigation using fine-grained sediments was carried out. Two similar flume systems were used, each consisting of a main channel carrying sediment-laden flow and an orthogonally placed closed-end channel with a gate at the entrance. Characteristics of the turbidity current and sediment deposition in the closed-end channel were investigated following gate opening. Behavioral similarities between turbidity current and non-settling gravity currents were observed. Several properties, e.g. suspension concentration, showed exponential-type decay with distance. The ratio of sediment settling velocity to the densimetric velocity was found to be a useful parameter for comparing different test results. A relationship for estimating the sediment influx through the entrance is presented.

Keywords


turbidity; sedimentation; closed-end channel; channel

Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.