Monitoring wind waves in Nantucket Sound off South Cape Beach

Maxim Sheremet (Sturgis Charter Public School)

Chris Weidman (WBNERR)

South Cape Beach Wave Exp_Poster_NaturalHistoryConference_2016

Remotely Determining Tidal Currents and Volumetric Discharge

Erika D. Johnson

Woods Hole Oceanographic Institution

Funding Source(s): Woods Hole Oceanographic Institution

In-situ ecosystem metabolism measured by eddy correlation

PI: Matthew Long, WHOI
Funding: WHOI

Estuarine Hydrodynamics – the velocity field, tides, seiching, and storm-generated currents

PIs: Vitalii Sheremet, University of RI, NOAA NMFS Research Fellow
Chris Weidman, WBNERR
Funding: NOAA NMFS Research Fellowship, WBNERR collaborative in-kind

 

Development of Low-cost, In-situ, Precision Hydrodynamic Instrumentation for Measurement of Tides, Currents and Waves

Vitallii compressed

PI: Vitalii Sheremet, University of RI, NOAA NMFS Research Fellow

Funding: NOAA NMFS Research Fellowship, WBNERR collaborative in-kind

An inexpensive current meter based on the drag principle is being designed and developed. It provides a simple, elegant, robust, and low-cost solution for measuring currents at the ocean bottom or from any fixed platform. Its operation is based on the drag law of a buoyant tethered cylinder in flowing water. Three-axis accelerometers measure tilts which are converted to a horizontal velocity vector. Special tethered attachment enables estimation of not only the magnitude but also horizontal direction of the current. The same accelerometers are also used to construct a simple stick-and-float tide gauge.

The performance of the instruments is being evaluated in field tests in Waquoit Bay and Nantucket Sound. Arrays of the instruments deployed for periods from days to months are used to record tidal and higher frequency oscillations in the Waquoit Bay. A dramatic double peaked flood (double height) tide arising from nonlinear interaction with bathymetry is studied. Strong seiches with periods of about 15-30 minutes are also recorded in some parts of the Waquoit Bay system.