Sediment Concentration and Sediment Transport Due to Action of Waves and a Current

摘要

The ultimate objective of the study is to investigate the mechanism of the cross-shore transport phenomenon to improve existing predictive models. In the study, emphasis is placed on two main areas: The spatial and temporal behavior of sediment concentration (on an intra-wave scale) under waves with a current; The relative importance of the fluctuations of sediment concentration and velocity in sediment transport. To achieve this objective, laboratory experiments were carried out in a wave flume. Local instantaneous sediment concentration and velocity were measured under the combined action of non-breaking waves and a current. Measurements were made at a number of elevations above the bed. Instrumentation consisted of an optical concentration meter (OPCON) and an electromagnetic flow meter (EMS). The OPCON together with the EMS had the capacity to measure sediment concentration and velocity on an intra-wave scale.