Scott A Wright (Former Employee)
Science and Products
Filter Total Items: 53
Physical characteristics of the lower San Joaquin River, California, in relation to white sturgeon spawning habitat, 2011–14
The U.S. Fish and Wildlife Service confirmed that white sturgeon (Acipenser transmontanus) recently spawned in the lower San Joaquin River, California. Decreases in the San Francisco Bay estuary white sturgeon population have led to an increased effort to understand their migration behavior and habitat preferences. The preferred spawning habitat of other white sturgeon (for example, those in the C
Authors
Mathieu D. Marineau, Scott Wright, Daniel R. Whealdon-Haught, Paul J. Kinzel
Daily reservoir sedimentation model: Case study from the Fena Valley Reservoir, Guam
A model to compute reservoir sedimentation rates at daily timescales is presented. The model uses streamflow and sediment load data from nearby stream gauges to obtain an initial estimate of sediment yield for the reservoir’s watershed; it is then calibrated to the total deposition calculated from repeat bathymetric surveys. Long-term changes to reservoir trapping efficiency are also taken into ac
Authors
Mathieu D. Marineau, Scott Wright
Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings
The use of “off-the-shelf” acoustic Doppler velocity profilers (ADCPs) to estimate suspended sediment concentration and grain-size in rivers requires robust methods to estimate sound attenuation by suspended sediment. Theoretical estimates of sediment attenuation require a priori knowledge of the concentration and grain-size distribution (GSD), making the method impractical to apply in routine mon
Authors
Dan Haught, Jeremy G. Venditti, Scott Wright
Bed-material characteristics of the Sacramento–San Joaquin Delta, California, 2010–13
The characteristics of bed material at selected sites within the Sacramento–San Joaquin Delta, California, during 2010–13 are described in a study conducted by the U.S. Geological Survey in cooperation with the Bureau of Reclamation. During 2010‒13, six complete sets of samples were collected. Samples were initially collected at 30 sites; however, starting in 2012, samples were collected at 7 addi
Authors
Mathieu D. Marineau, Scott Wright
Long-term continuous acoustical suspended-sediment measurements in rivers – Theory, evaluation, and results from 14 stations on five rivers
We have developed a physically based method for using two acoustic frequencies to measure suspended-silt-and-clay concentration, suspended-sand concentration, and suspended-sand median grain size in river cross sections at 15-minute intervals over decadal timescales. The method is strongly grounded in the extensive scientific literature on the scattering of sound by suspensions of small particles
Authors
David Topping, Scott Wright, Ronald E. Griffiths, David Dean
Characterizing changes in streamflow and sediment supply in the Sacramento River Basin, California, using hydrological simulation program—FORTRAN (HSPF)
A daily watershed model of the Sacramento River Basin of northern California was developed to simulate streamflow and suspended sediment transport to the San Francisco Bay-Delta. To compensate for sparse data, a unique combination of model inputs was developed, including meteorological variables, potential evapotranspiration, and parameters defining hydraulic geometry. A slight decreasing trend of
Authors
Michelle A. Stern, Lorraine E. Flint, Justin Toby Minear, Alan L. Flint, Scott Wright
Long-term continuous acoustical suspended-sediment measurements in rivers - Theory, application, bias, and error
It is commonly recognized that suspended-sediment concentrations in rivers can change rapidly in time and independently of water discharge during important sediment‑transporting events (for example, during floods); thus, suspended-sediment measurements at closely spaced time intervals are necessary to characterize suspended‑sediment loads. Because the manual collection of sufficient numbers of sus
Authors
David J. Topping, Scott Wright
Recent advances in understanding flow dynamics and transport of water-quality constituents in the Sacramento–San Joaquin River Delta
This paper, part of the collection of research
comprising the State of Bay–Delta Science 2016,
describes advances during the past decade in
understanding flow dynamics and how water-quality
constituents move within California’s Sacramento–
San Joaquin River Delta (Delta). Water-quality
constituents include salinity, heat, oxygen, nutrients,
contaminants, organic particles, and inorganic
particles.
Authors
David H. Schoellhamer, Scott Wright, Stephen G. Monismith, Brian A. Bergamaschi
Using hydrophones as a surrogate monitoring technique to detect temporal and spatial variability in bedload transport
Collecting physical bedload measurements is an expensive and time-consuming endeavor that rarely captures the spatial and temporal variability of sediment transport. Technological advances can improve monitoring of sediment transport by filling in temporal gaps between physical sampling periods. We have developed a low-cost hydrophone recording system designed to record the sediment-generated nois
Authors
Mathieu D. Marineau, J. Toby Minear, Scott Wright
Storage capacity of the Fena Valley Reservoir, Guam, Mariana Islands, 2014
The Fena Valley Reservoir is in southern Guam and is the primary source of water for the U.S. Naval Base Guam and nearby village residents. Since the construction of the Fena Dam in 1951, sediment has accumulated in the reservoir and reduced its storage capacity. The reservoir was surveyed previously in 1973, 1979, and 1990 to estimate the loss in storage capacity. To determine the current storage
Authors
Mathieu D. Marineau, Scott Wright
Building sandbars in the Grand Canyon
In 1963, the U.S. Department of the Interior’s Bureau of Reclamation finished building Glen Canyon Dam on the Colorado River in northern Arizona, 25 kilometers upstream from Grand Canyon National Park. The dam impounded 300 kilometers of the Colorado River, creating Lake Powell, the nation’s second largest reservoir.
By 1974, scientists found that the downstream river’s alluvial sandbars were erod
Authors
Paul E. Grams, John C. Schmidt, Scott Wright, David Topping, Theodore S. Melis, David M. Rubin
Assessing geomorphic change along the Trinity River downstream from Lewiston Dam, California, 1980-2011
The Trinity River Restoration Program, one of the nation’s largest adaptively managed river restoration programs, requires periodic assessment to determine the effectiveness of management actions in restoring channel dynamics and habitat features. This study documents riparian and channel changes along an intensively managed 65-kilometer reach of the Trinity River in California, downstream from Le
Authors
Jennifer A. Curtis, Scott Wright, Justin Toby Minear, Lorraine E. Flint
Science and Products
Filter Total Items: 53
Physical characteristics of the lower San Joaquin River, California, in relation to white sturgeon spawning habitat, 2011–14
The U.S. Fish and Wildlife Service confirmed that white sturgeon (Acipenser transmontanus) recently spawned in the lower San Joaquin River, California. Decreases in the San Francisco Bay estuary white sturgeon population have led to an increased effort to understand their migration behavior and habitat preferences. The preferred spawning habitat of other white sturgeon (for example, those in the C
Authors
Mathieu D. Marineau, Scott Wright, Daniel R. Whealdon-Haught, Paul J. Kinzel
Daily reservoir sedimentation model: Case study from the Fena Valley Reservoir, Guam
A model to compute reservoir sedimentation rates at daily timescales is presented. The model uses streamflow and sediment load data from nearby stream gauges to obtain an initial estimate of sediment yield for the reservoir’s watershed; it is then calibrated to the total deposition calculated from repeat bathymetric surveys. Long-term changes to reservoir trapping efficiency are also taken into ac
Authors
Mathieu D. Marineau, Scott Wright
Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings
The use of “off-the-shelf” acoustic Doppler velocity profilers (ADCPs) to estimate suspended sediment concentration and grain-size in rivers requires robust methods to estimate sound attenuation by suspended sediment. Theoretical estimates of sediment attenuation require a priori knowledge of the concentration and grain-size distribution (GSD), making the method impractical to apply in routine mon
Authors
Dan Haught, Jeremy G. Venditti, Scott Wright
Bed-material characteristics of the Sacramento–San Joaquin Delta, California, 2010–13
The characteristics of bed material at selected sites within the Sacramento–San Joaquin Delta, California, during 2010–13 are described in a study conducted by the U.S. Geological Survey in cooperation with the Bureau of Reclamation. During 2010‒13, six complete sets of samples were collected. Samples were initially collected at 30 sites; however, starting in 2012, samples were collected at 7 addi
Authors
Mathieu D. Marineau, Scott Wright
Long-term continuous acoustical suspended-sediment measurements in rivers – Theory, evaluation, and results from 14 stations on five rivers
We have developed a physically based method for using two acoustic frequencies to measure suspended-silt-and-clay concentration, suspended-sand concentration, and suspended-sand median grain size in river cross sections at 15-minute intervals over decadal timescales. The method is strongly grounded in the extensive scientific literature on the scattering of sound by suspensions of small particles
Authors
David Topping, Scott Wright, Ronald E. Griffiths, David Dean
Characterizing changes in streamflow and sediment supply in the Sacramento River Basin, California, using hydrological simulation program—FORTRAN (HSPF)
A daily watershed model of the Sacramento River Basin of northern California was developed to simulate streamflow and suspended sediment transport to the San Francisco Bay-Delta. To compensate for sparse data, a unique combination of model inputs was developed, including meteorological variables, potential evapotranspiration, and parameters defining hydraulic geometry. A slight decreasing trend of
Authors
Michelle A. Stern, Lorraine E. Flint, Justin Toby Minear, Alan L. Flint, Scott Wright
Long-term continuous acoustical suspended-sediment measurements in rivers - Theory, application, bias, and error
It is commonly recognized that suspended-sediment concentrations in rivers can change rapidly in time and independently of water discharge during important sediment‑transporting events (for example, during floods); thus, suspended-sediment measurements at closely spaced time intervals are necessary to characterize suspended‑sediment loads. Because the manual collection of sufficient numbers of sus
Authors
David J. Topping, Scott Wright
Recent advances in understanding flow dynamics and transport of water-quality constituents in the Sacramento–San Joaquin River Delta
This paper, part of the collection of research
comprising the State of Bay–Delta Science 2016,
describes advances during the past decade in
understanding flow dynamics and how water-quality
constituents move within California’s Sacramento–
San Joaquin River Delta (Delta). Water-quality
constituents include salinity, heat, oxygen, nutrients,
contaminants, organic particles, and inorganic
particles.
Authors
David H. Schoellhamer, Scott Wright, Stephen G. Monismith, Brian A. Bergamaschi
Using hydrophones as a surrogate monitoring technique to detect temporal and spatial variability in bedload transport
Collecting physical bedload measurements is an expensive and time-consuming endeavor that rarely captures the spatial and temporal variability of sediment transport. Technological advances can improve monitoring of sediment transport by filling in temporal gaps between physical sampling periods. We have developed a low-cost hydrophone recording system designed to record the sediment-generated nois
Authors
Mathieu D. Marineau, J. Toby Minear, Scott Wright
Storage capacity of the Fena Valley Reservoir, Guam, Mariana Islands, 2014
The Fena Valley Reservoir is in southern Guam and is the primary source of water for the U.S. Naval Base Guam and nearby village residents. Since the construction of the Fena Dam in 1951, sediment has accumulated in the reservoir and reduced its storage capacity. The reservoir was surveyed previously in 1973, 1979, and 1990 to estimate the loss in storage capacity. To determine the current storage
Authors
Mathieu D. Marineau, Scott Wright
Building sandbars in the Grand Canyon
In 1963, the U.S. Department of the Interior’s Bureau of Reclamation finished building Glen Canyon Dam on the Colorado River in northern Arizona, 25 kilometers upstream from Grand Canyon National Park. The dam impounded 300 kilometers of the Colorado River, creating Lake Powell, the nation’s second largest reservoir.
By 1974, scientists found that the downstream river’s alluvial sandbars were erod
Authors
Paul E. Grams, John C. Schmidt, Scott Wright, David Topping, Theodore S. Melis, David M. Rubin
Assessing geomorphic change along the Trinity River downstream from Lewiston Dam, California, 1980-2011
The Trinity River Restoration Program, one of the nation’s largest adaptively managed river restoration programs, requires periodic assessment to determine the effectiveness of management actions in restoring channel dynamics and habitat features. This study documents riparian and channel changes along an intensively managed 65-kilometer reach of the Trinity River in California, downstream from Le
Authors
Jennifer A. Curtis, Scott Wright, Justin Toby Minear, Lorraine E. Flint