Richard P Signell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 83
Hydrodynamic forcing and sediment character in Boston Harbor
Calculated annual excess skin friction stress at various locations in Quincy Bay (outer Boston Harbor) was found to be correlated positively with sediment sand content. The correlation was optimized when a critical shear stress (??c) of 0.085 Pa was assumed for the bay. The excess shear stress was correlated negatively with sediment lead (Pb) and polychlorinated biphenyl (PCB) concentrations. Thes
Authors
T.M. Ravens, O.S. Madsen, R. P. Signell, E.E. Adams, P.M. Gschwend
Modeling waves and circulation in Lake Pontchartrain, Louisiana
The U.S. Geological Survey is conducting a study of storm-driven sediment resuspension and transport in Lake Pontchartrain, Louisiana. Two critical processes related to sediment transport in the lake are (1) the resuspension of sediments due to wind-generated storm waves and (2) the movement of resuspended material by lake currents during storm wind events. The potential for sediment resuspension
Authors
Richard P. Signell, Jeffrey H. List
Lateral trapping of sediment in partially mixed estuary
No abstract available.
Authors
W. R. Geyer, R. P. Signell, G. C. Kineke
The wind-forced response on a buoyant coastal current: Observations of the western Gulf of Maine plume
The Freshwater plume in the western Gulf of Maine is being studied as part of an interdisciplinary investigation of the physical transport of a toxic alga. A field program was conducted in the springs of 1993 and 1994 to map the spatial and temporal patterns of salinity, currents and algal toxicity. The observations suggest that the plume's cross-shore structure varies markedly as a function of fl
Authors
D.A. Fong, W.R. Geyer, R. P. Signell
Physical processes affecting the sedimentary environments of Long Island Sound
A modeling study was undertaken to simulate the bottom tidal-, wave-, and wind-driven currents in Long Island Sound in order to provide a general physical oceanographic framework for understanding the characteristics and distribution of seafloor sedimentary environments. Tidal currents are important in the funnel-shaped eastern part of the Sound, where a strong gradient of tidal-current speed was
Authors
R. P. Signell, H. J. Knebel, J. H. List, A.S. Farris
Effect of wave-enhanced bottom friction on storm-driven circulation in Massachusetts Bay
Massachusetts Bay is a shallow (35 m average depth) semienclosed embayment, roughly 100 ?? 50 km, which opens into the Gulf of Maine at its eastern boundary. Surface waves associated with winter storm winds from the northeast cause large sediment resuspension events, and wave and circulation fields during these events have a quasi-steady response to the wind stress. Coupled wave, circulation, and
Authors
R. P. Signell, J. H. List
Coupled physical-biological models for the study of harmful algal blooms
No abstract available.
Authors
Peter J.S. Franks, Richard P. Signell
Circulation and effluent dilution modeling in Massachusetts Bay : model implementation, verification and results
A three-dimensional hydrodynamic model was developed as part of a cooperative U.S. Geological Survey/Massachusetts Water Resources Authority program to study contaminated sediment accumulation and transport in Massachusetts Bay. This report details the development of the model and assesses how well the model represents observed currents and water properties in the bay. It also summarizes circulati
Authors
Richard P. Signell, Harry L. Jenter, Alan F. Blumberg
Open-ocean boundary conditions from interior data: Local and remote forcing of Massachusetts Bay
Massachusetts and Cape Cod Bays form a semienclosed coastal basin that opens onto the much larger Gulf of Maine. Subtidal circulation in the bay is driven by local winds and remotely driven flows from the gulf. The local-wind forced flow is estimated with a regional shallow water model driven by wind measurements. The model uses a gravity wave radiation condition along the open-ocean boundary. Res
Authors
P.S. Bogden, P. Malanotte-Rizzoli, R. Signell
Seafloor topography of Massachusetts and Cape Cod Bays and Stellwagen Bank National Marine Sanctuary
No abstract available.
Authors
Page C. Valentine, Eric A. Schmuck, Richard P. Signell, Carol A. Ryland
Modeling the seasonal circulation in Massachusetts Bay
An 18 month simulation of circulation was conducted in Massachusetts Bay, a roughly 35 m deep, 100??50 km embayment on the northeastern shelf of the United States. Using a variant of the Blumberg-Mellor (1987) model, it was found that a continuous 18 month run was only possible if the velocity field was Shapiro filtered to remove two grid length energy that developed along the open boundary due to
Authors
Richard P. Signell, Harry L. Jenter, Alan F. Blumberg
Modeling the tides of Massachusetts and Cape Cod Bays
A time-dependent, three-dimensional numerical modeling study of the tides of Massachusetts and Cape Code Bays, motivated by construction of a new sewage treatment plant and ocean outfall for the city of Boston, has been undertaken by the authors. The numerical model being used is a hybrid version of the Blumberg and Mellor ECOM3D model, modified to include a semi-implicit time-stepping scheme and
Authors
H. L. Jenter, R. P. Signell, A.F. Blumberg
Science and Products
Filter Total Items: 83
Hydrodynamic forcing and sediment character in Boston Harbor
Calculated annual excess skin friction stress at various locations in Quincy Bay (outer Boston Harbor) was found to be correlated positively with sediment sand content. The correlation was optimized when a critical shear stress (??c) of 0.085 Pa was assumed for the bay. The excess shear stress was correlated negatively with sediment lead (Pb) and polychlorinated biphenyl (PCB) concentrations. Thes
Authors
T.M. Ravens, O.S. Madsen, R. P. Signell, E.E. Adams, P.M. Gschwend
Modeling waves and circulation in Lake Pontchartrain, Louisiana
The U.S. Geological Survey is conducting a study of storm-driven sediment resuspension and transport in Lake Pontchartrain, Louisiana. Two critical processes related to sediment transport in the lake are (1) the resuspension of sediments due to wind-generated storm waves and (2) the movement of resuspended material by lake currents during storm wind events. The potential for sediment resuspension
Authors
Richard P. Signell, Jeffrey H. List
Lateral trapping of sediment in partially mixed estuary
No abstract available.
Authors
W. R. Geyer, R. P. Signell, G. C. Kineke
The wind-forced response on a buoyant coastal current: Observations of the western Gulf of Maine plume
The Freshwater plume in the western Gulf of Maine is being studied as part of an interdisciplinary investigation of the physical transport of a toxic alga. A field program was conducted in the springs of 1993 and 1994 to map the spatial and temporal patterns of salinity, currents and algal toxicity. The observations suggest that the plume's cross-shore structure varies markedly as a function of fl
Authors
D.A. Fong, W.R. Geyer, R. P. Signell
Physical processes affecting the sedimentary environments of Long Island Sound
A modeling study was undertaken to simulate the bottom tidal-, wave-, and wind-driven currents in Long Island Sound in order to provide a general physical oceanographic framework for understanding the characteristics and distribution of seafloor sedimentary environments. Tidal currents are important in the funnel-shaped eastern part of the Sound, where a strong gradient of tidal-current speed was
Authors
R. P. Signell, H. J. Knebel, J. H. List, A.S. Farris
Effect of wave-enhanced bottom friction on storm-driven circulation in Massachusetts Bay
Massachusetts Bay is a shallow (35 m average depth) semienclosed embayment, roughly 100 ?? 50 km, which opens into the Gulf of Maine at its eastern boundary. Surface waves associated with winter storm winds from the northeast cause large sediment resuspension events, and wave and circulation fields during these events have a quasi-steady response to the wind stress. Coupled wave, circulation, and
Authors
R. P. Signell, J. H. List
Coupled physical-biological models for the study of harmful algal blooms
No abstract available.
Authors
Peter J.S. Franks, Richard P. Signell
Circulation and effluent dilution modeling in Massachusetts Bay : model implementation, verification and results
A three-dimensional hydrodynamic model was developed as part of a cooperative U.S. Geological Survey/Massachusetts Water Resources Authority program to study contaminated sediment accumulation and transport in Massachusetts Bay. This report details the development of the model and assesses how well the model represents observed currents and water properties in the bay. It also summarizes circulati
Authors
Richard P. Signell, Harry L. Jenter, Alan F. Blumberg
Open-ocean boundary conditions from interior data: Local and remote forcing of Massachusetts Bay
Massachusetts and Cape Cod Bays form a semienclosed coastal basin that opens onto the much larger Gulf of Maine. Subtidal circulation in the bay is driven by local winds and remotely driven flows from the gulf. The local-wind forced flow is estimated with a regional shallow water model driven by wind measurements. The model uses a gravity wave radiation condition along the open-ocean boundary. Res
Authors
P.S. Bogden, P. Malanotte-Rizzoli, R. Signell
Seafloor topography of Massachusetts and Cape Cod Bays and Stellwagen Bank National Marine Sanctuary
No abstract available.
Authors
Page C. Valentine, Eric A. Schmuck, Richard P. Signell, Carol A. Ryland
Modeling the seasonal circulation in Massachusetts Bay
An 18 month simulation of circulation was conducted in Massachusetts Bay, a roughly 35 m deep, 100??50 km embayment on the northeastern shelf of the United States. Using a variant of the Blumberg-Mellor (1987) model, it was found that a continuous 18 month run was only possible if the velocity field was Shapiro filtered to remove two grid length energy that developed along the open boundary due to
Authors
Richard P. Signell, Harry L. Jenter, Alan F. Blumberg
Modeling the tides of Massachusetts and Cape Cod Bays
A time-dependent, three-dimensional numerical modeling study of the tides of Massachusetts and Cape Code Bays, motivated by construction of a new sewage treatment plant and ocean outfall for the city of Boston, has been undertaken by the authors. The numerical model being used is a hybrid version of the Blumberg and Mellor ECOM3D model, modified to include a semi-implicit time-stepping scheme and
Authors
H. L. Jenter, R. P. Signell, A.F. Blumberg