David Schoellhamer (Former Employee)
Science and Products
Filter Total Items: 150
Suspended-sediment dynamics in the tidal reach of a San Francisco Bay tributary
To better understand suspended-sediment transport in a tidal slough adjacent to a large wetland restoration project, we deployed continuously-measuring temperature, salinity, depth, turbidity, and velocity sensors since 2010, and added a dissolved-oxygen sensor in 2012, at a near-bottom location in Alviso Slough (Alviso, California USA). Alviso Slough is the downstream reach of the Guadalupe River
Authors
Gregory Shellenbarger, Maureen A. Downing-Kunz, David H. Schoellhamer
Estimation of historic flows and sediment loads to San Francisco Bay,1849–2011
River flow and sediment transport in estuaries influence morphological development over decadal and century time scales, but hydrological and sedimentological records are typically too short to adequately characterize long-term trends. In this study, we recover archival records and apply a rating curve approach to develop the first instrumental estimates of daily delta inflow and sediment loads to
Authors
H.R. Moftakhari, D.A. Jay, S.A. Talke, David H. Schoellhamer
Wetland Accretion Rate Model of Ecosystem Resilience (WARMER) and its application to habitat sustainability for endangered species in the San Francisco Estuary
Salt marsh faunas are constrained by specific habitat requirements for marsh elevation relative to sea level and tidal range. As sea level rises, changes in relative elevation of the marsh plain will have differing impacts on the availability of habitat for marsh obligate species. The Wetland Accretion Rate Model for Ecosystem Resilience (WARMER) is a 1-D model of elevation that incorporates both
Authors
Kathleen M. Swanson, Judith Z. Drexler, David H. Schoellhamer, Karen M. Thorne, Michael L. Casazza, Cory T. Overton, John C. Callaway, John Y. Takekawa
Continuous water-quality and suspended-sediment transport monitoring in the San Francisco Bay, California, water years 2011–13
The U.S. Geological Survey (USGS) monitors water quality and suspended-sediment transport in the San Francisco Bay. The San Francisco Bay area is home to millions of people, and the bay teems with both resident and migratory wildlife, plants, and fish. Fresh water mixes with salt water in the bay, which is subject both to riverine and marine (tides, waves, influx of salt water) influences. To unde
Authors
Paul A. Buchanan, Maureen A. Downing-Kunz, David H. Schoellhamer, Gregory Shellenbarger, Kurt Weidich
Factors controlling floc settling velocity along a longitudinal estuarine transect
A 147 km longitudinal transect of flocculated cohesive sediment properties in San Francisco Bay (SFB) was conducted on June 17th, 2008. Our aim was to determine the factors that control floc settling velocity along the longitudinal axis of the estuary. The INSSEV-LF video system was used to measure floc diameters and settling velocities at 30 stations at a distance of 0.7 m above the estuary bed.
Authors
A.J. Manning, David H. Schoellhamer
Comparison of sediment supply to San Francisco Bay from watersheds draining the Bay Area and the Central Valley of California
Quantifying suspended sediment loads is important for managing the world's estuaries in the context of navigation, pollutant transport, wetland restoration, and coastal erosion. To address these needs, a comprehensive analysis was completed on sediment supply to San Francisco Bay from fluvial sources. Suspended sediment, optical backscatter, velocity data near the head of the estuary, and discharg
Authors
L.J. McKee, M. Lewicki, David H. Schoellhamer, Neil K. Ganju
Changes in surfzone morphodynamics driven by multi-decadal contraction of a large ebb-tidal delta
The impact of multi-decadal, large-scale deflation (76 million m3 of sediment loss) and contraction (~ 1 km) of a 150 km2 ebb-tidal delta on hydrodynamics and sediment transport at adjacent Ocean Beach in San Francisco, CA (USA), is examined using a coupled wave and circulation model. The model is forced with representative wave and tidal conditions using recent (2005) and historic (1956) ebb-tida
Authors
Jeff E. Hansen, Edwin Elias, Patrick L. Barnard
Influence of history and environment on the sediment dynamics of intertidal flats
Morphological trends of three distinct intertidal environments in South San Francisco Bay were investigated using a combination of measurement and modeling tools. Because of the inherent relationship between the physical environment and the sediment properties, the sediment properties provide a good indicator of morphologic trends. A significant finding of this study is that surface sediment erodi
Authors
Craig A. Jones, Bruce E. Jaffe
Understanding processes controlling sediment transports at the mouth of a highly energetic inlet system (San Francisco Bay, CA)
San Francisco Bay is one of the largest estuaries along the U.S. West Coast and is linked to the Pacific Ocean through the Golden Gate, a 100 m deep bedrock inlet. A coupled wave, flow and sediment transport model is used to quantify the sediment linkages between San Francisco Bay, the Golden Gate, and the adjacent open coast. Flow and sediment transport processes are investigated using an ensembl
Authors
Edwin P.L. Elias, Jeff E. Hansen
Does centennial morphodynamic evolution lead to higher channel efficiency in San Pablo Bay, California?
Measured bathymetries on 30 year interval over the past 150 years show that San Pablo Bay experienced periods of considerable deposition followed by periods of net erosion. However, the main channel in San Pablo Bay has continuously narrowed. The underlying mechanisms and consequences of this tidal channel evolution are not well understood.
The central question of this study is whether tidal chan
Authors
M. van der Wegen, Bruce E. Jaffe
Heavy mineral analysis for assessing the provenance of sandy sediment in the San Francisco Bay Coastal System
Heavy or high-specific gravity minerals make up a small but diagnostic component of sediment that is well suited for determining the provenance and distribution of sediment transported through estuarine and coastal systems worldwide. By this means, we see that surficial sand-sized sediment in the San Francisco Bay Coastal System comes primarily from the Sierra Nevada and associated terranes by way
Authors
Florence L. Wong, Donald L. Woodrow, Mary McGann
Sand sources and transport pathways for the San Francisco Bay coastal system, based on X-ray diffraction mineralogy
The mineralogical compositions of 119 samples collected from throughout the San Francisco Bay coastal system, including bayfloor and seafloor, area beaches, cliff outcrops, and major drainages, were determined using X-ray diffraction (XRD). Comparison of the mineral concentrations and application of statistical cluster analysis of XRD spectra allowed for the determination of provenances and transp
Authors
James R. Hein, Kira Mizell, Patrick L. Barnard
Science and Products
Filter Total Items: 150
Suspended-sediment dynamics in the tidal reach of a San Francisco Bay tributary
To better understand suspended-sediment transport in a tidal slough adjacent to a large wetland restoration project, we deployed continuously-measuring temperature, salinity, depth, turbidity, and velocity sensors since 2010, and added a dissolved-oxygen sensor in 2012, at a near-bottom location in Alviso Slough (Alviso, California USA). Alviso Slough is the downstream reach of the Guadalupe River
Authors
Gregory Shellenbarger, Maureen A. Downing-Kunz, David H. Schoellhamer
Estimation of historic flows and sediment loads to San Francisco Bay,1849–2011
River flow and sediment transport in estuaries influence morphological development over decadal and century time scales, but hydrological and sedimentological records are typically too short to adequately characterize long-term trends. In this study, we recover archival records and apply a rating curve approach to develop the first instrumental estimates of daily delta inflow and sediment loads to
Authors
H.R. Moftakhari, D.A. Jay, S.A. Talke, David H. Schoellhamer
Wetland Accretion Rate Model of Ecosystem Resilience (WARMER) and its application to habitat sustainability for endangered species in the San Francisco Estuary
Salt marsh faunas are constrained by specific habitat requirements for marsh elevation relative to sea level and tidal range. As sea level rises, changes in relative elevation of the marsh plain will have differing impacts on the availability of habitat for marsh obligate species. The Wetland Accretion Rate Model for Ecosystem Resilience (WARMER) is a 1-D model of elevation that incorporates both
Authors
Kathleen M. Swanson, Judith Z. Drexler, David H. Schoellhamer, Karen M. Thorne, Michael L. Casazza, Cory T. Overton, John C. Callaway, John Y. Takekawa
Continuous water-quality and suspended-sediment transport monitoring in the San Francisco Bay, California, water years 2011–13
The U.S. Geological Survey (USGS) monitors water quality and suspended-sediment transport in the San Francisco Bay. The San Francisco Bay area is home to millions of people, and the bay teems with both resident and migratory wildlife, plants, and fish. Fresh water mixes with salt water in the bay, which is subject both to riverine and marine (tides, waves, influx of salt water) influences. To unde
Authors
Paul A. Buchanan, Maureen A. Downing-Kunz, David H. Schoellhamer, Gregory Shellenbarger, Kurt Weidich
Factors controlling floc settling velocity along a longitudinal estuarine transect
A 147 km longitudinal transect of flocculated cohesive sediment properties in San Francisco Bay (SFB) was conducted on June 17th, 2008. Our aim was to determine the factors that control floc settling velocity along the longitudinal axis of the estuary. The INSSEV-LF video system was used to measure floc diameters and settling velocities at 30 stations at a distance of 0.7 m above the estuary bed.
Authors
A.J. Manning, David H. Schoellhamer
Comparison of sediment supply to San Francisco Bay from watersheds draining the Bay Area and the Central Valley of California
Quantifying suspended sediment loads is important for managing the world's estuaries in the context of navigation, pollutant transport, wetland restoration, and coastal erosion. To address these needs, a comprehensive analysis was completed on sediment supply to San Francisco Bay from fluvial sources. Suspended sediment, optical backscatter, velocity data near the head of the estuary, and discharg
Authors
L.J. McKee, M. Lewicki, David H. Schoellhamer, Neil K. Ganju
Changes in surfzone morphodynamics driven by multi-decadal contraction of a large ebb-tidal delta
The impact of multi-decadal, large-scale deflation (76 million m3 of sediment loss) and contraction (~ 1 km) of a 150 km2 ebb-tidal delta on hydrodynamics and sediment transport at adjacent Ocean Beach in San Francisco, CA (USA), is examined using a coupled wave and circulation model. The model is forced with representative wave and tidal conditions using recent (2005) and historic (1956) ebb-tida
Authors
Jeff E. Hansen, Edwin Elias, Patrick L. Barnard
Influence of history and environment on the sediment dynamics of intertidal flats
Morphological trends of three distinct intertidal environments in South San Francisco Bay were investigated using a combination of measurement and modeling tools. Because of the inherent relationship between the physical environment and the sediment properties, the sediment properties provide a good indicator of morphologic trends. A significant finding of this study is that surface sediment erodi
Authors
Craig A. Jones, Bruce E. Jaffe
Understanding processes controlling sediment transports at the mouth of a highly energetic inlet system (San Francisco Bay, CA)
San Francisco Bay is one of the largest estuaries along the U.S. West Coast and is linked to the Pacific Ocean through the Golden Gate, a 100 m deep bedrock inlet. A coupled wave, flow and sediment transport model is used to quantify the sediment linkages between San Francisco Bay, the Golden Gate, and the adjacent open coast. Flow and sediment transport processes are investigated using an ensembl
Authors
Edwin P.L. Elias, Jeff E. Hansen
Does centennial morphodynamic evolution lead to higher channel efficiency in San Pablo Bay, California?
Measured bathymetries on 30 year interval over the past 150 years show that San Pablo Bay experienced periods of considerable deposition followed by periods of net erosion. However, the main channel in San Pablo Bay has continuously narrowed. The underlying mechanisms and consequences of this tidal channel evolution are not well understood.
The central question of this study is whether tidal chan
Authors
M. van der Wegen, Bruce E. Jaffe
Heavy mineral analysis for assessing the provenance of sandy sediment in the San Francisco Bay Coastal System
Heavy or high-specific gravity minerals make up a small but diagnostic component of sediment that is well suited for determining the provenance and distribution of sediment transported through estuarine and coastal systems worldwide. By this means, we see that surficial sand-sized sediment in the San Francisco Bay Coastal System comes primarily from the Sierra Nevada and associated terranes by way
Authors
Florence L. Wong, Donald L. Woodrow, Mary McGann
Sand sources and transport pathways for the San Francisco Bay coastal system, based on X-ray diffraction mineralogy
The mineralogical compositions of 119 samples collected from throughout the San Francisco Bay coastal system, including bayfloor and seafloor, area beaches, cliff outcrops, and major drainages, were determined using X-ray diffraction (XRD). Comparison of the mineral concentrations and application of statistical cluster analysis of XRD spectra allowed for the determination of provenances and transp
Authors
James R. Hein, Kira Mizell, Patrick L. Barnard