Abstract
Some of such missing information on the front of surface currents spreading in a diverging channel as intrusion length, flow thickness and densimetric Froude number in both buoyancy-inertia and buoyancyviscous region have been quantified experimentally.The effects of a curtain, placed in the steady surface currents in a diverging channel, on the mixing of lighter inflow water with heavier ambient water are investigated experimentally. It is found that some of heavier ambient water is lifted up by the upwelling motion of the lighter surface layer fluid along the curtain, and consequently the dilution rate of surface layer will increase with the ratio of the submerged depth of the curtain to the inflow depth.
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