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Internal waves are known to generate currents sufficient to suspend seabed sediment. Presented here are firstever measurements of the near-seabed currents over a sand dune field in the South China Sea (SCS) during the passage of internal solitary waves (ISW) in June 2014 aboard the R/V Ocean Research V (OR5). Horizontal currents were observed to exceed 100 cm/s, reaching as high as 200 cm/s in one...
In coastal, estuarine and bay waters, tidal current is the basic sea water movement and one of main hydrodynamic factors. Affected by bottom topography, coastline and islands, the tidal current assumes itself to-and-fro movement, that is, the flood current and ebb current are basically in the opposite direction, with difference of about 180°. One of the important indexes to depict to-and-fro tidal...
Continuous near bottom measurements of wave characteristics, bottom velocity and turbidity were performed using an acoustic Doppler velocimeter (Sontek ADV Ocean Hydra) integrated with turbidity meter (YSI OBS-3+) and a pressure wave gauge (PTR Group). An experimental autonomous submersible camera system (by the Center for Biorobotics) was used to monitor the motion of particles in the bottom boundary...
This article presents some preliminary results of the sedimentary dynamics observed during the first 3 months of data collection obtained with the Acoustic Wave and Current Profiler installed in the OBSEA platform in the coast of Vilanova i la Geltrú (NW Mediterranean)
Dependence of near bottom currents and turbidity on wind and wave parameters is analyzed. Measurements campaigns with an acoustic Doppler velocymeter (ADV Field/Hydra, SonTek/YSI) were curried out in two bays in north western Estonia - the first one on Naissaar Shallow in Tallinn Bay (22.12.2009-12.01.2010, water depth 9 m, 37 cm from the bottom) and the second one in Keibu Bay (03.06.2010-26.06.2010,...
According to the stratified observed data of flow velocity and sediment concentration of two consecutive tidal cycles at 29 stations in the tidal channels of Jiangsu radial sand bars, the paper carries out comparison and analysis to the statistical characteristic values of the suspended sediment concentration in the tidal channels with comparative analysis and fitting research method, and establishes...
Based on the stratified observed data of flow velocity and sediment concentration of two consecutive tidal cycles at 29 stations in the tidal channels of Jiangsu radial sand bars, this paper establishes a series of dynamic relational expressions of vertical mean sediment concentration in the tidal channels of radial sand ridges with the measured data. The studies show that these vertical mean expression...
In support of development and validation of a wave and current model for the coastal zone off Massachusetts in the United States of America, two deployments of a small tripod were made in 15 m depth in Buzzards Bay. The tripod bore an upward looking Acoustic Doppler Current Profiler (ADCP) and, on one deployment, a Modular Acoustic Velocity Sensor (MAVS) current meter 1.5 m above the bottom. From...
An integration method will be presented to combine a one dimensional bottom shear stress model based on hydrodynamic field observations with radar current data. The data acquired are the bathymetry, the surface current velocity, the grain size and vertical profiles of the current and water characteristics. The observation method used here was run fully operationally for the first time during an experiment...
A 5-month long record on currents, waves and other hydrological variables was obtained by means of Recording Doppler Current Profilers (RDCP) 1.5 km off the Kelba spit of Saaremaa Island over a period from December 2006 to May 2007. A parallel study of coastal changes was based on orthophotos and the measurements of beach ridges, as well as on the GPS measurements made in 2005, 2006 and 2007 to identify...
Lithuania has only a short (92 km long) coastline along the south east coast of the Baltic Sea. The coast and a belt near it are mostly covered with sand. Sand lies in a narrow coastal bottom zone to the depth of about 7 meters and partly in deeper areas. To keep the necessary depth the Klaipėda Port periodically deepens the navigable canal. It has been done since the 19th century. The process of...
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