MEASUREMENTS OF THE SUSPENDED SEDIMENT CONCENTRATION OVER RIPPLED SEABEDS DURING SANDYDUCK'97 EXPERIMENT

摘要

A field experiment was conducted to investigate small-scale sediment dynamics near the seabed in the nearshore region. The SandyDuck'97 experiment took place at the U.S. Army Corps of Engineers Field Research Facility, in Duck, North Carolina, U.S.A. The vertical distribution of Suspended Sediment Concentration (SSC) is investigated over low amplitude wave orbital ripples in two different data sets with comparable hydrodynamic conditions but with the sediment concentration measurements located at relatively different cross-shore positions relative to the bedforms. The concentration profiles exhibit different temporal patterns that relate to their different locations over the bedforms. The vertical and temporal structures of the concentration profiles indicate significant horizontal advection of clouds of suspended sediment by the wave induced orbital fluid motion.