A Laboratory Study for Settling Velocities of Cohesive Sediments Entering in Semi-closed Channel

摘要

This study aims to estimate settling velocity (Ws) for cohesive sediments from water bodies (Incheon Coast,Kulpo Stream and Han River) mainly connected to the Kyeongin Ara-waterway through the laboratory settling experiments.Results of settling tests for these sediments show that Ws values for sediments are quite different each other: Ws values of Kulpo Stream sediments (0.01 Ws 3.07 mm/s) are quite similar with those of Han River sediments (0.01 Ws 2.97 mm/s) over the whole range of suspension concentration C (0.1 C 90 g/L),while they are quite different with those for Incheon Coast sediments (0.01 Ws 0.92 mm/s).Qualitative analyses on test results for physico- chemical properties of sediments and waters with respect to settling velocities show that these differences in settling velocities are mainly due to the salinity difference in the water.