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Articles 1 - 21 of 21
Full-Text Articles in Environmental Sciences
Hydrodynamics And Morphology Of Equilibrium Tidal Freshwater Channels, Carl Friedrichs
Hydrodynamics And Morphology Of Equilibrium Tidal Freshwater Channels, Carl Friedrichs
Presentations
This presentation addresses the dynamics and morphology of near-equilibrium tidal freshwater channels. The dynamics considered are based on sectionally-averaged current velocity and a barotropic momentum balance. A series of geometries are examined which attempt to encompass generic, reasonably realistic scenarios for tidal fresh water channels found in nature. This work presents and scales the governing equations of mass and momentum conservation. An essential step in this process is the identification of key length scales, corresponding inverse length scales (or "spatial rates of change"), and dimensionless ratios to be used subsequently to determine when and where to keep or neglect various …
Estuarine Sediment Transport And Sedimentation, Carl T. Friedrichs
Estuarine Sediment Transport And Sedimentation, Carl T. Friedrichs
Presentations
No abstract provided.
Evaluating The Capabilities Of The Second Generation Pics Settling Column Floc Camera In A Muddy Tidal Estuary, York River, Virginia, Usa, Grace M. Cartwright, S. Jarrell Smith, Carl T. Friedrichs, Kelsey A. Fall
Evaluating The Capabilities Of The Second Generation Pics Settling Column Floc Camera In A Muddy Tidal Estuary, York River, Virginia, Usa, Grace M. Cartwright, S. Jarrell Smith, Carl T. Friedrichs, Kelsey A. Fall
Presentations
No abstract provided.
Acoustic Scattering To Measure Dispersed Oil Droplet Size And Sediment Particle Size, Paul D. Panetta, Leslie Bland, Grace M. Cartwright, Carl T. Friedrichs
Acoustic Scattering To Measure Dispersed Oil Droplet Size And Sediment Particle Size, Paul D. Panetta, Leslie Bland, Grace M. Cartwright, Carl T. Friedrichs
Presentations
No abstract provided.
Dual Use Of A Sediment Mixing Tank For Calibrating Acoustic Backscatter And Direct Doppler Measurement Of Settling Velocity, Grace M. Cartwright, Carl T. Friedrichs, Paul D. Panetta
Dual Use Of A Sediment Mixing Tank For Calibrating Acoustic Backscatter And Direct Doppler Measurement Of Settling Velocity, Grace M. Cartwright, Carl T. Friedrichs, Paul D. Panetta
Presentations
While the Acoustic Doppler Velocimeter (ADV) is designed to determine fluid velocity, it is important to recognize that it is actually the velocity of the scatterers themselves that is measured. Thus in a calibration tank designed to relate sediment-induced backscatter to sediment concentration, the vertical velocity registered by an ADV at a given point is actually the true fluid velocity plus the sediment’s settling velocity. And absent net vertical volume flux, the average vertical velocity registered by an ADV across a horizontal plane is equal to the mean sediment settling velocity. For this study, a series of ADV calibrations were …
Relationships Between Erodibility And Fine-Grained Seabed Properties On Tidal To Seasonal Time-Scales, York River Estuary, Virginia, Usa, Lindsey M. Kraatz, Carl T. Friedrichs, Grace M. Cartwright, Kelsey A. Fall
Relationships Between Erodibility And Fine-Grained Seabed Properties On Tidal To Seasonal Time-Scales, York River Estuary, Virginia, Usa, Lindsey M. Kraatz, Carl T. Friedrichs, Grace M. Cartwright, Kelsey A. Fall
Presentations
No abstract provided.
Controls On Particle Settling Velocity And Bed Erodibility In The Presence Of Muddy Flocs And Pellets As Inferred By Advs, York River Estuary, Virginia, Usa, Kelsey A. Fall, Carl T. Friedrichs, Grace M. Cartwright
Controls On Particle Settling Velocity And Bed Erodibility In The Presence Of Muddy Flocs And Pellets As Inferred By Advs, York River Estuary, Virginia, Usa, Kelsey A. Fall, Carl T. Friedrichs, Grace M. Cartwright
Presentations
No abstract provided.
Damping Of Turbulence By Suspended Sediment: Ramifications Of Under-Saturated, Critically-Saturated, And Over-Saturated Conditions, Carl T. Friedrichs
Damping Of Turbulence By Suspended Sediment: Ramifications Of Under-Saturated, Critically-Saturated, And Over-Saturated Conditions, Carl T. Friedrichs
Presentations
No abstract provided.
Combining Observational And Numerical Model Results To Improve Estimates Of Hypoxic Volume In Chesapeake Bay, A. J. Bever, Marjorie A.M. Friedrichs, Carl T. Friedrichs, M. E. Scully
Combining Observational And Numerical Model Results To Improve Estimates Of Hypoxic Volume In Chesapeake Bay, A. J. Bever, Marjorie A.M. Friedrichs, Carl T. Friedrichs, M. E. Scully
Presentations
No abstract provided.
Spatial And Temporal Trends In Tidal Flat Shape In San Francisco Bay, J. A. Bearman, Carl T. Friedrichs, B. E. Jaffe, A. C. Foxgrover
Spatial And Temporal Trends In Tidal Flat Shape In San Francisco Bay, J. A. Bearman, Carl T. Friedrichs, B. E. Jaffe, A. C. Foxgrover
Presentations
No abstract provided.
Results Of The Us Ioos Testbed For Comparison Of Hydrodynamic And Dissolved Oxygen Models Of The Chesapeake Bay, M.A.M. Friedrichs, A. J. Bever, M. E. Scully, W. Long
Results Of The Us Ioos Testbed For Comparison Of Hydrodynamic And Dissolved Oxygen Models Of The Chesapeake Bay, M.A.M. Friedrichs, A. J. Bever, M. E. Scully, W. Long
Presentations
Results from multiple 3-D hydrodynamic and dissolved oxygen models for Chesapeake Bay have been compared to each other and to EPA monitoring data for the years 2004 and 2005. On seasonal time-scales, the models all do well in capturing fundamental aspects of the hydrodynamic and oxygen fields, although the intensity of the pycnocline is underestimated. Models with constant net respiration independent of nutrient supply reproduce hypoxia nearly as well as much more complex, nutrient-dependent ecological models. Seasonal variation in DO was insensitive to seasonal cycles in the respiration rate, freshwater input, and density stratification. Rather, seasonal variation in DO was …
Use Of Acoustic Doppler Velocimeters (Advs) To Infer Relationships Among Fine Sediment Settling, Bed Erodibility And Particle Type, York River Estuary, Va, K. A. Fall, Carl T. Friedrichs, Grace M. Cartwright
Use Of Acoustic Doppler Velocimeters (Advs) To Infer Relationships Among Fine Sediment Settling, Bed Erodibility And Particle Type, York River Estuary, Va, K. A. Fall, Carl T. Friedrichs, Grace M. Cartwright
Presentations
Bed erodibility and particle settling velocity are key factors influencing fine sediment dynamics in coastal and estuarine environments. In order to better constrain inherently complex, temporally-varying relationships among hydrodynamics, bed properties and particle types, near-bed ADVs have been maintained in the York River Estuary since 2006. The ADVs provide measurements of bottom stress, suspended sediment concentration (C, via calibrated backscatter), and particle settling velocity (Ws, via a Rouse balance). By assuming Ws to be the combined result of rapidly settling fecal pellets plus more slowly settling flocs, the time-varying fraction of pellets versus flocs can be estimated. Vertical integration of …
Dual Use Of A Sediment Mixing Tank For Calibrating Acoustic Backscatter And Direct Doppler Measurement Of Settling Velocity, Grace M. Cartwright, Carl T. Friedrichs, P. D. Panetta
Dual Use Of A Sediment Mixing Tank For Calibrating Acoustic Backscatter And Direct Doppler Measurement Of Settling Velocity, Grace M. Cartwright, Carl T. Friedrichs, P. D. Panetta
Presentations
While the Acoustic Doppler Velocimeter (ADV) is designed to determine fluid velocity, it is important to recognize that it is actually the velocity of the scatterers themselves that is measured. Thus in a calibration tank designed to relate sediment-induced backscatter to sediment concentration, the vertical velocity registered by an ADV at a given point is actually the true fluid velocity plus the sediment’s settling velocity. And absent net vertical volume flux, the average vertical velocity registered by an ADV across a horizontal plane is equal to the mean sediment settling velocity. For this study, a series of ADV calibrations were …
Spring-Neap Variation In Fecal Pellet Properties Within Surficial Sediment Of The York River Stuary, Virginia, E. A. Wei, L. M. Kraatz, Carl T. Friedrichs
Spring-Neap Variation In Fecal Pellet Properties Within Surficial Sediment Of The York River Stuary, Virginia, E. A. Wei, L. M. Kraatz, Carl T. Friedrichs
Presentations
Fecal pellet abundance was measured within the upper seabed of the York River Estuary as part of a larger study investigating relationships between fine sediment aggregates and bed erodibility. Sedimentalogical surveys were conducted twice a month during the spring and summer of 2011 to coincide with spring or neap tidal cycles. Particle size distributions were determined by sieving the sediment using three methods: 1) typical grain size analysis, 2) gentle agitation with seawater, 3) gentle agitation with deionized water. Each method used four sieves (150, 90, 63 and 45 microns) to constrain the size abundance of the particles. The study …
Relationships Between Erodibility And Fine-Grained Seabed Properties On Tidal To Seasonal Time-Scales, York River Estuary, Virginia, L. M. Kraatz, Carl T. Friedrichs, Grace M. Cartwright, K. A. Fall
Relationships Between Erodibility And Fine-Grained Seabed Properties On Tidal To Seasonal Time-Scales, York River Estuary, Virginia, L. M. Kraatz, Carl T. Friedrichs, Grace M. Cartwright, K. A. Fall
Presentations
The complex bio-geo-physical nature of muddy particles in coastal and estuarine environments has limited our understanding of finegrained sediment dynamics. An ongoing sedimentalogical study within the York River Estuary is investigating controls on cohesive bed erodibility by assessing changes in seabed properties over varying timescales. During the spring and summer of 2010 and 2011, multiple GOMEX box cores were collected and subsampled for grain size, fecal pellet content, Gust chamber erodibility, and water content. Initial findings suggest that erodibility of the seabed increased during periods following seasonal deposition events. Higher erodibility was also generally found to coincide with peak spring …
Intercomparison Of 3-D Models For Estuarine Hydrodynamics And Hypoxia Within The Us Ioos Super-Regional Coastal Modeling Testbed, Carl T. Friedrichs, A. J. Bever, M.A.M. Friedrichs, The Estuarine Hypoxia Team
Intercomparison Of 3-D Models For Estuarine Hydrodynamics And Hypoxia Within The Us Ioos Super-Regional Coastal Modeling Testbed, Carl T. Friedrichs, A. J. Bever, M.A.M. Friedrichs, The Estuarine Hypoxia Team
Presentations
No abstract provided.
Transitioning A Chesapeake Bay Ecological Prediction System To Operations, D. Green
Transitioning A Chesapeake Bay Ecological Prediction System To Operations, D. Green
Presentations
No abstract provided.
Overview Of The Ioos/Sura Super-Regional Coastal Modeling Testbed, D. Wright
Overview Of The Ioos/Sura Super-Regional Coastal Modeling Testbed, D. Wright
Presentations
No abstract provided.
Ualbany Goes Local, Mary Ellen Mallia
Ualbany Goes Local, Mary Ellen Mallia
Presentations
Presented at the State of NY Sustainability Conference.
Hybrid Buses In The Real World, Mary Ellen Mallia
Hybrid Buses In The Real World, Mary Ellen Mallia
Presentations
Presented at the Northeast Campus Sustainability Consortium Conference
Simulation Of Coastal Inundation Instigated By Storm Surge And River Discharge In The Chesapeake Bay Using Sub-Grid Modeling Coupled With Lidar Data, J. D. Loftis, H. V. Wang
Simulation Of Coastal Inundation Instigated By Storm Surge And River Discharge In The Chesapeake Bay Using Sub-Grid Modeling Coupled With Lidar Data, J. D. Loftis, H. V. Wang
Presentations
Sub-grid modeling is a novel method by which water level elevations on the sub-grid level can be obtained through the combination of water levels and velocities efficiently calculated at the coarse computational grid, the discretized bathymetric depths, and local friction parameters without resorting to solve the full set of equations. Sub-grid technology essentially allows velocity to be determined rationally and efficiently at the sub-grid level. This salient feature enables coastal flooding to be addressed in a single cross-scale model from the ocean to the upstream river channel without overly refining the grid resolution. To this end, high-resolution DEMs will be …