Richard P Signell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 83
Modeling tidal exchange and dispersion in Boston Harbor
Tidal dispersion and the horizontal exchange of water between Boston Harbor and the surrounding ocean are examined with a high-resolution (200 m) depth-averaged numerical model. The strongly varying bathymetry and coastline geometry of the harbor generate complex spatial patterns in the modeled tidal currents which are verified by shipboard acoustic Doppler surveys. Lagrangian exchange...
Authors
Richard P. Signell, Bradford Butman
A reassessment of the role of tidal dispersion in estuaries and bays
The role of tidal dispersion is reassessed, based on a consideration of the relevant physical mechanisms, particularly those elucidated by numerical simulations of tide-induced dispersion. It appears that the principal influence of tidal currents on dispersion occurs at length scales of the tidal excursion and smaller; thus the effectiveness of tidal dispersion depends on the relative...
Authors
W. Rockwell Geyer, Richard P. Signell
Public-domain-software solution to data-access problems for numerical modelers
Unidata's network Common Data Form, netCDF, provides users with an efficient set of software for scientific-data-storage, retrieval, and manipulation. The netCDF file format is machine-independent, direct-access, self-describing, and in the public domain, thereby alleviating many problems associated with accessing output from large hydrodynamic models. NetCDF has programming interfaces...
Authors
Harry Jenter, Richard Signell
Tide- and wind-driven flushing of Boston Harbor, Massachusetts
The flushing of Boston Harbor, a shallow, tidally dominated embayment with little fresh water input, is investigated using a depth-averaged model. The modeled tidal currents exhibit strong spatial variability and ebb/flood asymmetry due to complex topography and coastline geometry and were verified by shipboard acoustic Doppler current profiler measurements. At the inlets to the harbor...
Authors
Richard Signell
Contaminant transport and accumulation in Massachusetts Bay and Boston Harbor: A summary of U.S. Geological Survey studies
The U.S. Geological Survey (USGS) is conducting studies in Boston Harbor, Massachusetts Bay, and Cape Cod Bay designed to define the geologic framework of the region and to understand the transport and accumulation of contaminated sediments. The region is being studied because of environmental problems caused by the introduction of wastes for a long time, because a new ocean outfall (to...
Authors
Bradford Butman, Michael H. Bothner, J.C. Hathaway, H. L. Jenter, H.J. Knebel, F.T. Manheim, R. P. Signell
Estimates of sediment movement and resuspension in the New York Bight; implications for dredged material disposal
No abstract available.
Authors
Richard P. Signell, Bradford Butman
Average near-bottom currents in Massachusetts Bay and Cape Cod Bay measured with woodhead drifters: Progress report for drifters released Sept. 1990 through May 1991
No abstract available.
Authors
Frances S. Hotchkiss, Richard P. Signell
Studies of circulation and pollutant transport in Massachusetts coastal waters
No abstract available.
Authors
Michael H. Bothner, C.M. Parmenter, A.B. Brown, Richard Signell
Effect of wave-current interaction on wind-driven circulation in narrow, shallow embayments
The effect of wind waves on the steady wind-driven circulation in a narrow, shallow bay is investigated with a two-dimensional (y, z) circulation model and the Grant and Madsen [1979] bottom-boundary layer model, which includes wave-current interaction. A constant wind stress is applied in the along-channel x direction to a channel with a constant cross-sectional profile h(y). The wind...
Authors
Richard P. Signell, Robert C. Beardsley, H. C. Graber, A. Capotondi
Flow separation of currents in shallow water
Flow separation of currents in shallow coastal areas is investigated using a boundary layer model for two-dimensional (depth-averaged) tidal flow past an elliptic headland. If the shoaling region near the coast is narrow compared to the scale of the headland, bottom friction causes the flow to separate just downstream of the point where the pressure gradient switches from favoring to...
Authors
Richard P. Signell
Current observations in Buzzards Bay, Massachusetts, 1982-1986; data report
No abstract available.
Authors
Bradford Butman, Richard Signell, Polly Shoukimas, R.C. Beardsley
Science and Products
Filter Total Items: 83
Modeling tidal exchange and dispersion in Boston Harbor
Tidal dispersion and the horizontal exchange of water between Boston Harbor and the surrounding ocean are examined with a high-resolution (200 m) depth-averaged numerical model. The strongly varying bathymetry and coastline geometry of the harbor generate complex spatial patterns in the modeled tidal currents which are verified by shipboard acoustic Doppler surveys. Lagrangian exchange...
Authors
Richard P. Signell, Bradford Butman
A reassessment of the role of tidal dispersion in estuaries and bays
The role of tidal dispersion is reassessed, based on a consideration of the relevant physical mechanisms, particularly those elucidated by numerical simulations of tide-induced dispersion. It appears that the principal influence of tidal currents on dispersion occurs at length scales of the tidal excursion and smaller; thus the effectiveness of tidal dispersion depends on the relative...
Authors
W. Rockwell Geyer, Richard P. Signell
Public-domain-software solution to data-access problems for numerical modelers
Unidata's network Common Data Form, netCDF, provides users with an efficient set of software for scientific-data-storage, retrieval, and manipulation. The netCDF file format is machine-independent, direct-access, self-describing, and in the public domain, thereby alleviating many problems associated with accessing output from large hydrodynamic models. NetCDF has programming interfaces...
Authors
Harry Jenter, Richard Signell
Tide- and wind-driven flushing of Boston Harbor, Massachusetts
The flushing of Boston Harbor, a shallow, tidally dominated embayment with little fresh water input, is investigated using a depth-averaged model. The modeled tidal currents exhibit strong spatial variability and ebb/flood asymmetry due to complex topography and coastline geometry and were verified by shipboard acoustic Doppler current profiler measurements. At the inlets to the harbor...
Authors
Richard Signell
Contaminant transport and accumulation in Massachusetts Bay and Boston Harbor: A summary of U.S. Geological Survey studies
The U.S. Geological Survey (USGS) is conducting studies in Boston Harbor, Massachusetts Bay, and Cape Cod Bay designed to define the geologic framework of the region and to understand the transport and accumulation of contaminated sediments. The region is being studied because of environmental problems caused by the introduction of wastes for a long time, because a new ocean outfall (to...
Authors
Bradford Butman, Michael H. Bothner, J.C. Hathaway, H. L. Jenter, H.J. Knebel, F.T. Manheim, R. P. Signell
Estimates of sediment movement and resuspension in the New York Bight; implications for dredged material disposal
No abstract available.
Authors
Richard P. Signell, Bradford Butman
Average near-bottom currents in Massachusetts Bay and Cape Cod Bay measured with woodhead drifters: Progress report for drifters released Sept. 1990 through May 1991
No abstract available.
Authors
Frances S. Hotchkiss, Richard P. Signell
Studies of circulation and pollutant transport in Massachusetts coastal waters
No abstract available.
Authors
Michael H. Bothner, C.M. Parmenter, A.B. Brown, Richard Signell
Effect of wave-current interaction on wind-driven circulation in narrow, shallow embayments
The effect of wind waves on the steady wind-driven circulation in a narrow, shallow bay is investigated with a two-dimensional (y, z) circulation model and the Grant and Madsen [1979] bottom-boundary layer model, which includes wave-current interaction. A constant wind stress is applied in the along-channel x direction to a channel with a constant cross-sectional profile h(y). The wind...
Authors
Richard P. Signell, Robert C. Beardsley, H. C. Graber, A. Capotondi
Flow separation of currents in shallow water
Flow separation of currents in shallow coastal areas is investigated using a boundary layer model for two-dimensional (depth-averaged) tidal flow past an elliptic headland. If the shoaling region near the coast is narrow compared to the scale of the headland, bottom friction causes the flow to separate just downstream of the point where the pressure gradient switches from favoring to...
Authors
Richard P. Signell
Current observations in Buzzards Bay, Massachusetts, 1982-1986; data report
No abstract available.
Authors
Bradford Butman, Richard Signell, Polly Shoukimas, R.C. Beardsley