DEVELOPMENT OF A REDUCTION DEVICE FOR TURBIDITY AND FLOW OF THE BOTTOM LAYER BY SEDIMENT DUMPED INTO A VERTICAL PIPE

Abstract

  In backfilling a dredged sea bed pit, reduction and containment of turbidity by dumped sediment are strongly required. In this study, an attachment device to a vertical pipe for reducing generation of turbidity was developed. In the experiments, flow velocity induced by dumped sediment into a vertical pipe and distribution of turbidity were measured in detail. It was shown by laboratory experiments that developed device can reduce velocity and thickness of turbidity cloud moving on the bottom. Moreover, a field experiment using a prototype device in a construction site was carried out. Based on the measured time-series data of velocity and turbidity, effectiveness of the developed device was presented.