David Schoellhamer (Former Employee)
Science and Products
Filter Total Items: 150
Trends in the sediment yield of the Sacramento River, 1957-2001 Trends in the sediment yield of the Sacramento River, 1957-2001
No abstract available.
Authors
S.A. Wright, D. H. Schoellhamer
Tidal and vertical variability of floc characteristics Tidal and vertical variability of floc characteristics
No abstract available.
Authors
Neil K. Ganju, David H. Schoellhamer
Effects of spatial and temporal variability of turbidity on phytoplankton blooms Effects of spatial and temporal variability of turbidity on phytoplankton blooms
A central challenge of coastal ecology is sorting out the interacting spatial and temporal components of environmental variability that combine to drive changes in phytoplankton biomass. For 2 decades, we have combined sustained observation and experimentation in South San Francisco Bay (SSFB) with numerical modeling analyses to search for general principles that define phytoplankton...
Authors
Christine May, Jeffrey Koseff, Lisa Lucas, James Cloern, David H. Schoellhamer
Sediment dynamics drive contaminant dynamics Sediment dynamics drive contaminant dynamics
Many contaminants of greatest concern in San Francisco Bay, including mercury and PCBs, are primarily associated with sediment particles rather than dissolved in water. Therefore, the movement and fate of sediment determines the movement and fate of many contaminants in the Bay. Because of this close association, the RMP monitors and seeks to understand the quantity and movement of...
Authors
David H. Schoellhamer, Gregory Shellenbarger, Neil K. Ganju, Jay A. Davis, Lester McKee
Effects of tidal current phase at the junction of two straits Effects of tidal current phase at the junction of two straits
Estuaries typically have a monotonic increase in salinity from freshwater at the head of the estuary to ocean water at the mouth, creating a consistent direction for the longitudinal baroclinic pressure gradient. However, Mare Island Strait in San Francisco Bay has a local salinity minimum created by the phasing of the currents at the junction of Mare Island and Carquinez Straits. The...
Authors
John C. Warner, David H. Schoellhamer, Jon Burau, Geoffrey Schladow
Variability of suspended-sediment concentration at tidal to annual time scales in San Francisco Bay, USA Variability of suspended-sediment concentration at tidal to annual time scales in San Francisco Bay, USA
Singular spectrum analysis for time series with missing data (SSAM) was used to reconstruct components of a 6-yr time series of suspended-sediment concentration (SSC) from San Francisco Bay. Data were collected every 15 min and the time series contained missing values that primarily were due to sensor fouling. SSAM was applied in a sequential manner to calculate reconstructed components...
Authors
D. H. Schoellhamer
Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration
Suspended sediment concentration (SSC) data from San Pablo Bay, California, were analyzed to compare the basin-scale effect of dredging and disposal of dredged material (dredging operations) and natural estuarine processes. The analysis used twelve 3-wk to 5-wk periods of mid-depth and near-bottom SSC data collected at Point San Pablo every 15 min from 1993-1998. Point San Pablo is...
Authors
D. H. Schoellhamer
Continuous monitoring of suspended sediment in rivers by use of optical backscatterance sensors Continuous monitoring of suspended sediment in rivers by use of optical backscatterance sensors
No abstract available.
Authors
D. H. Schoellhamer, S.A. Wright
Tidal asymmetry and variability of bed shear stress and sediment bed flux at a site in San Francisco Bay, USA Tidal asymmetry and variability of bed shear stress and sediment bed flux at a site in San Francisco Bay, USA
The relationship between sediment bed flux and bed shear stress during a pair of field experiments in a partially stratified estuary is examined in this paper. Time series of flow velocity, vertical density profiles, and suspended sediment concentration were measured continuously throughout the water column and intensely within 1 meter of the bed. These time series were analyzed to...
Authors
Matthew Brennan, David H. Schoellhamer, Jon Burau, Stephen G. Monismith
CISNet San Pablo Bay network of environmental stress indicators: the CISNet hydrodynamic database CISNet San Pablo Bay network of environmental stress indicators: the CISNet hydrodynamic database
No abstract available.
Authors
M.F. Barad, S.G. Schladow, J.C. Warner, D. H. Schoellhamer
Combined use of remote sensing and continuous monitoring to analyse the variability of suspended-sediment concentrations in San Francisco Bay, California Combined use of remote sensing and continuous monitoring to analyse the variability of suspended-sediment concentrations in San Francisco Bay, California
Analysis of suspended-sediment concentration data in San Francisco Bay is complicated by spatial and temporal variability. In situ optical backscatterance sensors provide continuous suspended-sediment concentration data, but inaccessibility, vandalism, and cost limit the number of potential monitoring stations. Satellite imagery reveals the spatial distribution of surficial-suspended...
Authors
C.A. Ruhl, D. H. Schoellhamer, R. Stumpf, C.L. Lindsay
Singular spectrum analysis for time series with missing data Singular spectrum analysis for time series with missing data
Geophysical time series often contain missing data, which prevents analysis with many signal processing and multivariate tools. A modification of singular spectrum analysis for time series with missing data is developed and successfully tested with synthetic and actual incomplete time series of suspended-sediment concentration from San Francisco Bay. This method also can be used to low...
Authors
D. H. Schoellhamer
Science and Products
Filter Total Items: 150
Trends in the sediment yield of the Sacramento River, 1957-2001 Trends in the sediment yield of the Sacramento River, 1957-2001
No abstract available.
Authors
S.A. Wright, D. H. Schoellhamer
Tidal and vertical variability of floc characteristics Tidal and vertical variability of floc characteristics
No abstract available.
Authors
Neil K. Ganju, David H. Schoellhamer
Effects of spatial and temporal variability of turbidity on phytoplankton blooms Effects of spatial and temporal variability of turbidity on phytoplankton blooms
A central challenge of coastal ecology is sorting out the interacting spatial and temporal components of environmental variability that combine to drive changes in phytoplankton biomass. For 2 decades, we have combined sustained observation and experimentation in South San Francisco Bay (SSFB) with numerical modeling analyses to search for general principles that define phytoplankton...
Authors
Christine May, Jeffrey Koseff, Lisa Lucas, James Cloern, David H. Schoellhamer
Sediment dynamics drive contaminant dynamics Sediment dynamics drive contaminant dynamics
Many contaminants of greatest concern in San Francisco Bay, including mercury and PCBs, are primarily associated with sediment particles rather than dissolved in water. Therefore, the movement and fate of sediment determines the movement and fate of many contaminants in the Bay. Because of this close association, the RMP monitors and seeks to understand the quantity and movement of...
Authors
David H. Schoellhamer, Gregory Shellenbarger, Neil K. Ganju, Jay A. Davis, Lester McKee
Effects of tidal current phase at the junction of two straits Effects of tidal current phase at the junction of two straits
Estuaries typically have a monotonic increase in salinity from freshwater at the head of the estuary to ocean water at the mouth, creating a consistent direction for the longitudinal baroclinic pressure gradient. However, Mare Island Strait in San Francisco Bay has a local salinity minimum created by the phasing of the currents at the junction of Mare Island and Carquinez Straits. The...
Authors
John C. Warner, David H. Schoellhamer, Jon Burau, Geoffrey Schladow
Variability of suspended-sediment concentration at tidal to annual time scales in San Francisco Bay, USA Variability of suspended-sediment concentration at tidal to annual time scales in San Francisco Bay, USA
Singular spectrum analysis for time series with missing data (SSAM) was used to reconstruct components of a 6-yr time series of suspended-sediment concentration (SSC) from San Francisco Bay. Data were collected every 15 min and the time series contained missing values that primarily were due to sensor fouling. SSAM was applied in a sequential manner to calculate reconstructed components...
Authors
D. H. Schoellhamer
Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration
Suspended sediment concentration (SSC) data from San Pablo Bay, California, were analyzed to compare the basin-scale effect of dredging and disposal of dredged material (dredging operations) and natural estuarine processes. The analysis used twelve 3-wk to 5-wk periods of mid-depth and near-bottom SSC data collected at Point San Pablo every 15 min from 1993-1998. Point San Pablo is...
Authors
D. H. Schoellhamer
Continuous monitoring of suspended sediment in rivers by use of optical backscatterance sensors Continuous monitoring of suspended sediment in rivers by use of optical backscatterance sensors
No abstract available.
Authors
D. H. Schoellhamer, S.A. Wright
Tidal asymmetry and variability of bed shear stress and sediment bed flux at a site in San Francisco Bay, USA Tidal asymmetry and variability of bed shear stress and sediment bed flux at a site in San Francisco Bay, USA
The relationship between sediment bed flux and bed shear stress during a pair of field experiments in a partially stratified estuary is examined in this paper. Time series of flow velocity, vertical density profiles, and suspended sediment concentration were measured continuously throughout the water column and intensely within 1 meter of the bed. These time series were analyzed to...
Authors
Matthew Brennan, David H. Schoellhamer, Jon Burau, Stephen G. Monismith
CISNet San Pablo Bay network of environmental stress indicators: the CISNet hydrodynamic database CISNet San Pablo Bay network of environmental stress indicators: the CISNet hydrodynamic database
No abstract available.
Authors
M.F. Barad, S.G. Schladow, J.C. Warner, D. H. Schoellhamer
Combined use of remote sensing and continuous monitoring to analyse the variability of suspended-sediment concentrations in San Francisco Bay, California Combined use of remote sensing and continuous monitoring to analyse the variability of suspended-sediment concentrations in San Francisco Bay, California
Analysis of suspended-sediment concentration data in San Francisco Bay is complicated by spatial and temporal variability. In situ optical backscatterance sensors provide continuous suspended-sediment concentration data, but inaccessibility, vandalism, and cost limit the number of potential monitoring stations. Satellite imagery reveals the spatial distribution of surficial-suspended...
Authors
C.A. Ruhl, D. H. Schoellhamer, R. Stumpf, C.L. Lindsay
Singular spectrum analysis for time series with missing data Singular spectrum analysis for time series with missing data
Geophysical time series often contain missing data, which prevents analysis with many signal processing and multivariate tools. A modification of singular spectrum analysis for time series with missing data is developed and successfully tested with synthetic and actual incomplete time series of suspended-sediment concentration from San Francisco Bay. This method also can be used to low...
Authors
D. H. Schoellhamer