ABSTRACT
This paper presents an experimental study into the Blocking Effectiveness (BE) of silt curtain on suspended materials under different conditions. Two types of sand samples were chosen for representing grains generated from outlet and dredging work. Moreover, two gaps between the silt bottom and the seabed were adopted to simulate the MHHW (Mean Higher High Water) and MLLW (Mean Lower Low Water) conditions. The current speed range was 0.02–0.04 m/s. The results indicated that the average permeability coefficient of the silt curtain was 0.0006 m/s. On the one hand, the blocking effectiveness of the silt curtain near the outlet ranged from 38% to 8%. The maximum value was observed at a speed of 0.02 m/s and at the water level MLLW. On the other hand, the blocking effectiveness of the silt curtain around the dredging area ranged from 59% to 40%. The maximum value was observed at a speed of 0.02 m/s and at the water level MLLW. From the results of the study, it can therefore be suggested that silt curtain around the dredging area is necessary and that near the outlet can be optional.
