David Schoellhamer (Former Employee)
Science and Products
Filter Total Items: 151
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 pass filter
Authors
D. H. Schoellhamer
Time series of suspended-solids concentration, salinity, temperature, and total mercury concentration in San Francisco Bay during water year 1998
Many physical processes affect how constituents within San Francisco Bay vary. Processes and their associated time scales include turbulence (seconds), semidiurnal and diurnal tides (hours), the spring-neap tidal cycle (days), freshwater flow (weeks), seasonal winds (months), ecological and climatic changes (years), and geologic changes (thousands of years). Continuous time series of data on basic
Authors
Catherine A. Ruhl, David H. Schoellhamer
Hydrodynamic and suspended-solids concentration measurements in Suisun Bay, California, 1995
Sea level, current velocity, water temperature, salinity (computed from conductivity and temperature), and suspended-solids data collected in Suisun Bay, California, from May 30, 1995, through October 27, 1995, by the U.S. Geological Survey are documented in this report. Data were collected concurrently at 21 sites. Various parameters were measured at each site. Velocity-profile data were collecte
Authors
Jay I. Cuetara, Jon R. Burau, David H. Schoellhamer
Exposure of delta smelt to dissolved pesticides in 1998 and 1999
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are minimal data to document the presence, or absence, of pesticides within delta smelt habitat, esp
Authors
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay
This article presents an overview of recent findings from hydrodynamic research on circulation and mixing in the Sacramento-San Joaquin Delta (Delta) (Figure 1) and North San Francisco Bay (North Bay) (Figure 2). For the purposes of this article, North Bay includes San Pablo Bay, Carquinez Strait, and Suisun Bay. The findings presented are those gained from field studies carried out by the U.S. Ge
Authors
Jon R. Burau, Stephen G. Monismith, Mark T. Stacey, Richard N. Oltmann, Jessica Lacy, David H. Schoellhamer
Influence of salinity, bottom topography, and tides on locations of estuarine turbidity maxima in northern San Francisco Bay
Time series of salinity and suspended-solids concentration measured at four locations and vertical profiles of salinity and suspended-solids concentration measured during 48 water-quality cruises from January 1993 to September 1997 are analyzed to describe the influence of salinity, bottom topography, and tides on locations of estuarine turbidity maxima in northern San Francisco Bay, California. E
Authors
David H. Schoellhamer
Summary of suspended-solids concentration data, San Francisco Bay, California, water year 1997
No abstract available.
Authors
Paul A. Buchanan, David H. Schoellhamer
Sedimentation in the delta of the Sacramento and San Joaquin Rivers
No abstract available.
Authors
R.L. Dinehart, D. H. Schoellhamer
Sedimentation in the delta of the Sacramento and San Joaquin Rivers
No abstract available.
Authors
R.L. Dinehart, D. H. Schoellhamer
Napa/Sonoma marsh hydrodynamic and water-quality study
No abstract available.
Authors
J.C. Warner, D. H. Schoellhamer, S.G. Schladow, J.R. Burau
Remote sensing: visual cues to suspended-solids transport in San Francisco Bay, California
No abstract available.
Authors
C.A. Ruhl, D. H. Schoellhamer, R. P. Stumpf, C.L. Lindsay
Time series of suspended-solids concentration in Honker Bay during water year 1997
Suspended-solids concentration (SSC) responds differently to seasonal variations, such as Delta outflow and wind in shallow water areas than in deep-water channels. Although San Francisco Bay includes extensive areas of shallow water, with about one-half of the surface area of the Bay being less than 2 meters deep (Conomos and Peterson, 1977), deep-water channels along the spine of San Francisco B
Authors
Catherine A. Ruhl, David H. Schoellhamer
Science and Products
Filter Total Items: 151
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 pass filter
Authors
D. H. Schoellhamer
Time series of suspended-solids concentration, salinity, temperature, and total mercury concentration in San Francisco Bay during water year 1998
Many physical processes affect how constituents within San Francisco Bay vary. Processes and their associated time scales include turbulence (seconds), semidiurnal and diurnal tides (hours), the spring-neap tidal cycle (days), freshwater flow (weeks), seasonal winds (months), ecological and climatic changes (years), and geologic changes (thousands of years). Continuous time series of data on basic
Authors
Catherine A. Ruhl, David H. Schoellhamer
Hydrodynamic and suspended-solids concentration measurements in Suisun Bay, California, 1995
Sea level, current velocity, water temperature, salinity (computed from conductivity and temperature), and suspended-solids data collected in Suisun Bay, California, from May 30, 1995, through October 27, 1995, by the U.S. Geological Survey are documented in this report. Data were collected concurrently at 21 sites. Various parameters were measured at each site. Velocity-profile data were collecte
Authors
Jay I. Cuetara, Jon R. Burau, David H. Schoellhamer
Exposure of delta smelt to dissolved pesticides in 1998 and 1999
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are minimal data to document the presence, or absence, of pesticides within delta smelt habitat, esp
Authors
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay
This article presents an overview of recent findings from hydrodynamic research on circulation and mixing in the Sacramento-San Joaquin Delta (Delta) (Figure 1) and North San Francisco Bay (North Bay) (Figure 2). For the purposes of this article, North Bay includes San Pablo Bay, Carquinez Strait, and Suisun Bay. The findings presented are those gained from field studies carried out by the U.S. Ge
Authors
Jon R. Burau, Stephen G. Monismith, Mark T. Stacey, Richard N. Oltmann, Jessica Lacy, David H. Schoellhamer
Influence of salinity, bottom topography, and tides on locations of estuarine turbidity maxima in northern San Francisco Bay
Time series of salinity and suspended-solids concentration measured at four locations and vertical profiles of salinity and suspended-solids concentration measured during 48 water-quality cruises from January 1993 to September 1997 are analyzed to describe the influence of salinity, bottom topography, and tides on locations of estuarine turbidity maxima in northern San Francisco Bay, California. E
Authors
David H. Schoellhamer
Summary of suspended-solids concentration data, San Francisco Bay, California, water year 1997
No abstract available.
Authors
Paul A. Buchanan, David H. Schoellhamer
Sedimentation in the delta of the Sacramento and San Joaquin Rivers
No abstract available.
Authors
R.L. Dinehart, D. H. Schoellhamer
Sedimentation in the delta of the Sacramento and San Joaquin Rivers
No abstract available.
Authors
R.L. Dinehart, D. H. Schoellhamer
Napa/Sonoma marsh hydrodynamic and water-quality study
No abstract available.
Authors
J.C. Warner, D. H. Schoellhamer, S.G. Schladow, J.R. Burau
Remote sensing: visual cues to suspended-solids transport in San Francisco Bay, California
No abstract available.
Authors
C.A. Ruhl, D. H. Schoellhamer, R. P. Stumpf, C.L. Lindsay
Time series of suspended-solids concentration in Honker Bay during water year 1997
Suspended-solids concentration (SSC) responds differently to seasonal variations, such as Delta outflow and wind in shallow water areas than in deep-water channels. Although San Francisco Bay includes extensive areas of shallow water, with about one-half of the surface area of the Bay being less than 2 meters deep (Conomos and Peterson, 1977), deep-water channels along the spine of San Francisco B
Authors
Catherine A. Ruhl, David H. Schoellhamer