Richard P Signell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 90
Modeling sand bank formation around tidal headlands Modeling sand bank formation around tidal headlands
Sandbanks are often found in the vicinity of coastal headlands around which tidal flows are strong enough to generate significant tidally-forced residual eddies, typically with scales of 2-10 km. One popular hypothesis is that these sandbanks are generated by a 'tidal stirring' mechanism in which the inward-directed pressure gradient associated with these residual eddies produces an...
Authors
Richard P. Signell, Courtney K. Harris
Circulation and sediment transport in the vicinity of the Hudson Shelf Valley Circulation and sediment transport in the vicinity of the Hudson Shelf Valley
Sediment transport in the Hudson Shelf Valley and on the adjacent Long Island Shelf are evaluated using available data along with a three-dimensional wind-driven circulation model and a one-dimensional sediment transport model. Winds from the northwest drive currents up the Hudson Shelf Valley, while winds from the east produce weaker currents directed down the valley. Consistent with...
Authors
Courtney K. Harris, Richard P. Signell
Seafloor environments in the Long Island Sound estuarine system Seafloor environments in the Long Island Sound estuarine system
Four categories of modern seafloor sedimentary environments have been identified and mapped across the large, glaciated, topographically complex Long Island Sound estuary by means of an extensive regional set of sidescan sonographs, bottom samples, and video-camera observations and supplemental marine-geologic and modeled physical-oceanographic data. (1) Environments of erosion or...
Authors
H.J. Knebel, R. P. Signell, R.R. Rendigs, L.J. Poppe, J. H. List
Construction of digital bathymetry for the Gulf of Maine Construction of digital bathymetry for the Gulf of Maine
No abstract available.
Authors
Ed T. Roworth, Rich P. Signell
Hydrodynamic forcing and sediment character in Boston Harbor 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)...
Authors
T.M. Ravens, O.S. Madsen, R. P. Signell, E.E. Adams, P.M. Gschwend
Modeling waves and circulation in Lake Pontchartrain, Louisiana 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...
Authors
Richard P. Signell, Jeffrey H. List
Science and Products
Filter Total Items: 90
Modeling sand bank formation around tidal headlands Modeling sand bank formation around tidal headlands
Sandbanks are often found in the vicinity of coastal headlands around which tidal flows are strong enough to generate significant tidally-forced residual eddies, typically with scales of 2-10 km. One popular hypothesis is that these sandbanks are generated by a 'tidal stirring' mechanism in which the inward-directed pressure gradient associated with these residual eddies produces an...
Authors
Richard P. Signell, Courtney K. Harris
Circulation and sediment transport in the vicinity of the Hudson Shelf Valley Circulation and sediment transport in the vicinity of the Hudson Shelf Valley
Sediment transport in the Hudson Shelf Valley and on the adjacent Long Island Shelf are evaluated using available data along with a three-dimensional wind-driven circulation model and a one-dimensional sediment transport model. Winds from the northwest drive currents up the Hudson Shelf Valley, while winds from the east produce weaker currents directed down the valley. Consistent with...
Authors
Courtney K. Harris, Richard P. Signell
Seafloor environments in the Long Island Sound estuarine system Seafloor environments in the Long Island Sound estuarine system
Four categories of modern seafloor sedimentary environments have been identified and mapped across the large, glaciated, topographically complex Long Island Sound estuary by means of an extensive regional set of sidescan sonographs, bottom samples, and video-camera observations and supplemental marine-geologic and modeled physical-oceanographic data. (1) Environments of erosion or...
Authors
H.J. Knebel, R. P. Signell, R.R. Rendigs, L.J. Poppe, J. H. List
Construction of digital bathymetry for the Gulf of Maine Construction of digital bathymetry for the Gulf of Maine
No abstract available.
Authors
Ed T. Roworth, Rich P. Signell
Hydrodynamic forcing and sediment character in Boston Harbor 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)...
Authors
T.M. Ravens, O.S. Madsen, R. P. Signell, E.E. Adams, P.M. Gschwend
Modeling waves and circulation in Lake Pontchartrain, Louisiana 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...
Authors
Richard P. Signell, Jeffrey H. List