EUROPEAN HYDRALAB DEVELOPMENTS IN ACOUSTICS FOR STUDYING NEAR-BED SEDIMENT DYNAMICS UNDER WAVES OVER SANDY RIPPLED BEDS

摘要

Sediment entrainment, transport, and deposition over bedforms is highly dynamic and temporally and spatially variable. Obtaining measurements to understand these sediment processes has led to ongoing developments in instrumentation for studying near-bed sediment dynamics. Here results are reported from three acoustic systems deployed to make observations of bedforms, bedload, suspended concentration and horizontal and vertical velocity components. To evaluate the instruments a series of near-bed boundary layer measurements were collected in a large scale flume facility over a rippled bed of medium sand under regular waves. The observations were conducted as part of Joint Research Activities within the EU funded Hydralab project.