registration mark
river view
river view



Research

Currents, Mixing and Sediment Transport

Map of ADCP deployments

Location of acoustic Doppler current profilers (ADCPs) deployed between 2002 and 2004 as part of the Riverscope pilot program. See table for description of sites.

Doppler current profilers (RD Instruments, Workhorse Monitor, 1200kHz) were deployed between 2002 and 2004 at five locations on the bed of the Hudson River and estuary at the sites shown in Figure 1. This was done to measure the pulse of suspended particles carried down the Hudson every spring with the freshet and to make high-frequency and high-resolution resolution measurements of the current in order to better understand turbulent mixing in the river.

Table with details on ADCP deployments (PDF download, 620 kB)

The instruments monitored current and sediment concentration. A CTD (conductivity, temperature, depth) measuring device was typically attached to the tripod throughout each deployment to continuously measure salinity, temperature and depth.

tripod

Philip Orton prepares a tripod with upward-looking ADCP for deployment.
Photo by B. Huber.

Two, 100-day deployments in the spring of 2004 at Piermont and Haverstraw were funded by the Environmental Protection Agency. The Piermont tripod deployed at that time also held a Wetlabs FLNTU-B flourometer and optical backscatter sensor that monitored chlorophyll concentrations and turbidity.

Observations

Acoustic Doppler current profilers (ADCPs) provide non-intrusive, high-resolution three-dimensional vertical profiles of current velocity. They also measure acoustic backscatter (ABS), which is a convenient proxy measurement for suspended sediment concentration (SSC) in the water column. The ABS data is being analyzed in collaboration with the United States Geological Survey's Lower Hudson River Discharge and Sediment Flux Project, with the aim of eventually posting figures online that summarize sediment transport in terms of mass. For the time being, the data are presented as ABS. Monthly CTD sections that stretch from the near the mouth of the Hudson at the Battery to Troy, N.Y. are also available online as part of the Riverscope project.

Links

USGS Lower Hudson River Discharge and Sediment Flux

USGS Streamflow Data for New York State