David M Rubin (Former Employee)
Science and Products
Filter Total Items: 69
Bed-sediment grain-size and morphologic data from Suisun, Grizzly, and Honker Bays, CA, 1998-2002 Bed-sediment grain-size and morphologic data from Suisun, Grizzly, and Honker Bays, CA, 1998-2002
The USGS Place Based Studies Program for San Francisco Bay investigates this sensitive estuarine system to aid in resource management. As part of the inter-disciplinary research program, the USGS collected side-scan sonar data and bed-sediment samples from north San Francisco Bay to characterize bed-sediment texture and investigate temporal trends in sedimentation. The study area is...
Authors
Margaret A. Hampton, Noah P. Snyder, John L. Chin, Dan W. Allison, David M. Rubin
Under San Francisco Bay — A new view of the floor of west-central San Francisco Bay Under San Francisco Bay — A new view of the floor of west-central San Francisco Bay
No abstract available.
Authors
David A. Cacchione, Paul R. Carlson, Pat F. Chavez, John L. Chin, Peter Dartnell, James V. Gardner, Helen Gibbons, David M. Rubin, Miguel Velasco, Florence L. Wong
Tsunami Tsunami
No abstract available.
Authors
Lori Dengler, Jose C. Borrero, Guy Gelfenbaum, Bruce Jaffe, Emile A. Okal, Modesto Ortiz, Vasily V. Titov, Roberto Anima, Luis Bernales Anticona, Sebastian Araya, Brandon Gomer, J. Gomez, Shun-ichi Koshimura, Gustavo Laos, Leonidas Ocala, Daniel Olcese, Robert Peters, Percy Colque Riega, David M. Rubin, Matthew Swensson, Fernando Vegas
Recent sediment studies refute Glen Canyon Dam hypothesis Recent sediment studies refute Glen Canyon Dam hypothesis
Recent studies of sedimentology hydrology, and geomorphology indicate that releases from Glen Canyon Dam are continuing to erode sandbars and beaches in the Colorado River in Grand Canyon National Park, despite attempts to restore these resources. The current strategy for dam operations is based on the hypothesis that sand supplied by tributaries of the Colorado River downstream from the...
Authors
David M. Rubin, David J. Topping, John C. Schmidt, Joe Hazel, Matt Kaplinski, Theodore S. Melis
The internal structure of sand bars on the Colorado River, Grand Canyon, as determined by ground-penetrating radar The internal structure of sand bars on the Colorado River, Grand Canyon, as determined by ground-penetrating radar
High-resolution, subsurface imagery from ground-penetrating radar (GPR) has revealed the internal structure of sand bars at seven sites on the Colorado River, Grand Canyon. Based on reconnaissance-level surveys, we recognized three stratigraphic units and several intervening unconformities. Unit A, which exhibits hyperbolic reflections and always occurs at the base of the section, is...
Authors
Walter A. Barnhardt, Robert Kayen, David Rubin, Diane L. Minasian
Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β
To predict changes in sediment transport, it is essential to know whether transport is regulated mainly by changes in flow or by changes in grain size of sediment on the bed. In flows where changes in suspended sediment transport are regulated purely by changes in flow (grain size of bed sediment is constant), increases in flow strength cause increases in both concentration and grain...
Authors
David M. Rubin, David J. Topping
Colorado River sediment transport: 1. Natural sediment supply limitation and the influence of Glen Canyon Dam Colorado River sediment transport: 1. Natural sediment supply limitation and the influence of Glen Canyon Dam
Analyses of flow, sediment‐transport, bed‐topographic, and sedimentologic data suggest that before the closure of Glen Canyon Dam in 1963, the Colorado River in Marble and Grand Canyons was annually supply‐limited with respect to fine sediment (i.e., sand and finer material). Furthermore, these analyses suggest that the predam river in Glen Canyon was not supply‐limited to the same...
Authors
David J. Topping, David M. Rubin, L. E. Vierra
Colorado River sediment transport: 2. Systematic bed‐elevation and grain‐size effects of sand supply limitation Colorado River sediment transport: 2. Systematic bed‐elevation and grain‐size effects of sand supply limitation
The Colorado River in Marble and Grand Canyons displays evidence of annual supply limitation with respect to sand both prior to [Topping et al, this issue] and after the closure of Glen Canyon Dam in 1963. Systematic changes in bed elevation and systematic coupled changes in suspended‐sand concentration and grain size result from this supply limitation. During floods, sand supply...
Authors
David J. Topping, David M. Rubin, Jonathan M. Nelson, Paul J. Kinzel, Ingrid C. Corson
Regulated streamflow, fine-grained deposits, and effective discharge in canyons with abundant debris fans Regulated streamflow, fine-grained deposits, and effective discharge in canyons with abundant debris fans
No abstract available.
Authors
John C. Schmidt, David M. Rubin
Nonperiodic eddy pulsations Nonperiodic eddy pulsations
Recirculating flow in lateral separation eddies is typically weaker than main stem flow and provides an effective environment for trapping sediment. Observations of recirculating flow and sedimentary structures demonstrate that eddies pulsate in size and in flow velocity even when main stem flow is steady. Time series measurements of flow velocity and location of the reattachment point...
Authors
David M. Rubin, Richard R. McDonald
How much velocity information is necessary to predict sediment suspension in the surf zone? How much velocity information is necessary to predict sediment suspension in the surf zone?
Instantaneous horizontal water velocity, or velocity to a power, does not contain enough information to predict suspension in the surf zone. Unlike steady uniform flow, more one than one velocity is necessary to parameterize pick-up and mixing of sediment into the water column. Using a velocity history improves predictions of suspension by more carefully specifying flow conditions...
Authors
Bruce E. Jaffe, David M. Rubin, Asbury Sallenger
Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space
No abstract available.
Authors
David M. Rubin, Roberto J. Anima, Rex Sanders
Science and Products
Filter Total Items: 69
Bed-sediment grain-size and morphologic data from Suisun, Grizzly, and Honker Bays, CA, 1998-2002 Bed-sediment grain-size and morphologic data from Suisun, Grizzly, and Honker Bays, CA, 1998-2002
The USGS Place Based Studies Program for San Francisco Bay investigates this sensitive estuarine system to aid in resource management. As part of the inter-disciplinary research program, the USGS collected side-scan sonar data and bed-sediment samples from north San Francisco Bay to characterize bed-sediment texture and investigate temporal trends in sedimentation. The study area is...
Authors
Margaret A. Hampton, Noah P. Snyder, John L. Chin, Dan W. Allison, David M. Rubin
Under San Francisco Bay — A new view of the floor of west-central San Francisco Bay Under San Francisco Bay — A new view of the floor of west-central San Francisco Bay
No abstract available.
Authors
David A. Cacchione, Paul R. Carlson, Pat F. Chavez, John L. Chin, Peter Dartnell, James V. Gardner, Helen Gibbons, David M. Rubin, Miguel Velasco, Florence L. Wong
Tsunami Tsunami
No abstract available.
Authors
Lori Dengler, Jose C. Borrero, Guy Gelfenbaum, Bruce Jaffe, Emile A. Okal, Modesto Ortiz, Vasily V. Titov, Roberto Anima, Luis Bernales Anticona, Sebastian Araya, Brandon Gomer, J. Gomez, Shun-ichi Koshimura, Gustavo Laos, Leonidas Ocala, Daniel Olcese, Robert Peters, Percy Colque Riega, David M. Rubin, Matthew Swensson, Fernando Vegas
Recent sediment studies refute Glen Canyon Dam hypothesis Recent sediment studies refute Glen Canyon Dam hypothesis
Recent studies of sedimentology hydrology, and geomorphology indicate that releases from Glen Canyon Dam are continuing to erode sandbars and beaches in the Colorado River in Grand Canyon National Park, despite attempts to restore these resources. The current strategy for dam operations is based on the hypothesis that sand supplied by tributaries of the Colorado River downstream from the...
Authors
David M. Rubin, David J. Topping, John C. Schmidt, Joe Hazel, Matt Kaplinski, Theodore S. Melis
The internal structure of sand bars on the Colorado River, Grand Canyon, as determined by ground-penetrating radar The internal structure of sand bars on the Colorado River, Grand Canyon, as determined by ground-penetrating radar
High-resolution, subsurface imagery from ground-penetrating radar (GPR) has revealed the internal structure of sand bars at seven sites on the Colorado River, Grand Canyon. Based on reconnaissance-level surveys, we recognized three stratigraphic units and several intervening unconformities. Unit A, which exhibits hyperbolic reflections and always occurs at the base of the section, is...
Authors
Walter A. Barnhardt, Robert Kayen, David Rubin, Diane L. Minasian
Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β
To predict changes in sediment transport, it is essential to know whether transport is regulated mainly by changes in flow or by changes in grain size of sediment on the bed. In flows where changes in suspended sediment transport are regulated purely by changes in flow (grain size of bed sediment is constant), increases in flow strength cause increases in both concentration and grain...
Authors
David M. Rubin, David J. Topping
Colorado River sediment transport: 1. Natural sediment supply limitation and the influence of Glen Canyon Dam Colorado River sediment transport: 1. Natural sediment supply limitation and the influence of Glen Canyon Dam
Analyses of flow, sediment‐transport, bed‐topographic, and sedimentologic data suggest that before the closure of Glen Canyon Dam in 1963, the Colorado River in Marble and Grand Canyons was annually supply‐limited with respect to fine sediment (i.e., sand and finer material). Furthermore, these analyses suggest that the predam river in Glen Canyon was not supply‐limited to the same...
Authors
David J. Topping, David M. Rubin, L. E. Vierra
Colorado River sediment transport: 2. Systematic bed‐elevation and grain‐size effects of sand supply limitation Colorado River sediment transport: 2. Systematic bed‐elevation and grain‐size effects of sand supply limitation
The Colorado River in Marble and Grand Canyons displays evidence of annual supply limitation with respect to sand both prior to [Topping et al, this issue] and after the closure of Glen Canyon Dam in 1963. Systematic changes in bed elevation and systematic coupled changes in suspended‐sand concentration and grain size result from this supply limitation. During floods, sand supply...
Authors
David J. Topping, David M. Rubin, Jonathan M. Nelson, Paul J. Kinzel, Ingrid C. Corson
Regulated streamflow, fine-grained deposits, and effective discharge in canyons with abundant debris fans Regulated streamflow, fine-grained deposits, and effective discharge in canyons with abundant debris fans
No abstract available.
Authors
John C. Schmidt, David M. Rubin
Nonperiodic eddy pulsations Nonperiodic eddy pulsations
Recirculating flow in lateral separation eddies is typically weaker than main stem flow and provides an effective environment for trapping sediment. Observations of recirculating flow and sedimentary structures demonstrate that eddies pulsate in size and in flow velocity even when main stem flow is steady. Time series measurements of flow velocity and location of the reattachment point...
Authors
David M. Rubin, Richard R. McDonald
How much velocity information is necessary to predict sediment suspension in the surf zone? How much velocity information is necessary to predict sediment suspension in the surf zone?
Instantaneous horizontal water velocity, or velocity to a power, does not contain enough information to predict suspension in the surf zone. Unlike steady uniform flow, more one than one velocity is necessary to parameterize pick-up and mixing of sediment into the water column. Using a velocity history improves predictions of suspension by more carefully specifying flow conditions...
Authors
Bruce E. Jaffe, David M. Rubin, Asbury Sallenger
Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space
No abstract available.
Authors
David M. Rubin, Roberto J. Anima, Rex Sanders