2005 hydrographic survey of south San Francisco Bay, California

Foxgrover, Amy C.; Jaffe, Bruce E.; Hovis, Gerald; Martin, Craig A.; Hubbard, James R.; Samant, Manoj R.; Sullivan, S.M.

doi:10.3133/ofr20071169

Cited by 4 publications

(3 citation statements)

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“…EBK was used to interpolate bathymetric acoustic sonar data in south San Francisco Bay for inclusion in the 2-m topobathymetric model. A 2005 hydrographic survey of south San Francisco Bay was used as source input for the EBK model (Foxgrover et al, 2007). This survey served as an essential baseline for tracking changes in the bay and provided insight into the sea floor topobathy from the 1980s to 2005.…”

Section: Ebk Model Validationmentioning

confidence: 99%

Topobathymetric Elevation Model Development using a New Methodology: Coastal National Elevation Database

Danielson

Poppenga

Brock

et al. 2016

Journal of Coastal Research

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During the coming decades, coastlines will respond to widely predicted sea-level rise, storm surge, and coastal inundation flooding from disastrous events. Because physical processes in coastal environments are controlled by the geomorphology of over-the-land topography and underwater bathymetry, many applications of geospatial data in coastal environments require detailed knowledge of the near-shore topography and bathymetry. In this paper, an updated methodology used by the U.S. Geological Survey Coastal National Elevation Database (CoNED) Applications Project is presented for developing coastal topobathymetric elevation models (TBDEMs) from multiple topographic data sources with adjacent intertidal topobathymetric and offshore bathymetric sources to generate seamlessly integrated TBDEMs. This repeatable, updatable, and logically consistent methodology assimilates topographic data (land elevation) and bathymetry (water depth) into a seamless coastal elevation model. Within the overarching framework, vertical datum transformations are standardized in a workflow that interweaves spatially consistent interpolation (gridding) techniques with a land/water boundary mask delineation approach. Output gridded raster TBDEMs are stacked into a file storage system of mosaic datasets within an Esri ArcGIS geodatabase for efficient updating while maintaining current and updated spatially referenced metadata. Topobathymetric data provide a required seamless elevation product for several science application studies, such as shoreline delineation, coastal inundation mapping, sediment-transport, sea-level rise, storm surge models, and tsunami impact assessment. These detailed coastal elevation data are critical to depict regions prone to climate change impacts and are essential to planners and managers responsible for mitigating the associated risks and costs to both human communities and ecosystems. The CoNED methodology approach has been used to construct integrated TBDEM models in Mobile Bay, the northern Gulf of Mexico, San Francisco Bay, the Hurricane Sandy region, and southern California.

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Section: Ebk Model Validationmentioning

confidence: 99%

Topobathymetric Elevation Model Development using a New Methodology: Coastal National Elevation Database

Danielson

Poppenga

Brock

et al. 2016

Journal of Coastal Research

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“…The primary data source for Central Bay was a 4-m DEM (USGS 2007) developed from multi-beam data collected in 1996 and 1997 (Gardner et al 1998). High-resolution bathymetry from an acoustic hydrographic survey conducted in 2005 (Foxgrover et al 2007) was used as the primary data source in South Bay. Bathymetry for the portions of Central Bay and South Bay not covered by the multi-beam surveys and for San Pablo Bay was derived from the 30-m DEM data generated by NOAA using NOS soundings and other bathymetry data collected from 1979from to 1985from (NOAA 1998.…”

Section: Bathymetric and Model Gridsmentioning

confidence: 99%

Three-Dimensional Modeling of Hydrodynamics and Salinity in the San Francisco Estuary: An Evaluation of Model Accuracy, X2, and the Low-Salinity Zone

MacWilliams¹,

Bever²,

Gross³

et al. 2015

SFEWS

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The three-dimensional UnTRIM San Francisco Bay-Delta model was applied to simulate tidal hydrodynamics and salinity in the San Francisco Estuary (estuary) using an unstructured grid. We compared model predictions to observations of water level, tidal flow, current speed, and salinity collected at 137 locations throughout the estuary. A quantitative approach based on multiple model assessment metrics was used to evaluate the model's accuracy for each comparison. These comparisons demonstrate that the model accurately predicted water level, tidal flow, and salinity during a 3-year simulation period that spanned a large range of flow and salinity conditions. The model is therefore suitable for detailed investigation of circulation patterns and salinity distributions in the estuary. The model was used to investigate the location, and spatial and temporal extent of the low-salinity zone (LSZ), defined by salinity between 0.5 and 6 psu. We calculated X2, the distance up the axis of the estuary to the daily-averaged 2-psu near-bed salinity, and the spatial extent of the LSZ for each day during the 3-year simulation. The location, area, volume, and average depth of the low-salinity zone varied with X2; however this variation was not monotonic and was largely controlled by the geometry of the estuary. We used predicted daily X2 values and the corresponding daily Delta outflow for each day during the 3-year simulation to develop a new equation to relate X2 to Delta outflow. This equation provides a conceptual improvement over previous equations by allowing the time constant for daily changes in X2 to vary with flow conditions. This improvement resulted in a smaller average error in X2 prediction than previous equations. These analyses demonstrate that a well-calibrated three-dimensional (3-D) hydrodynamic model is a valuable tool for investigating the salinity distributions in the estuary, and their influence on the distribution and abundance of physical habitat.

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“…See more details on mooring water depths in Table . Bathymetry from Foxgrover et al (). CTD = conductivity‐temperature‐depth probe; ADCP = Acoustic Doppler Current Profilers; MLLW = mean lower low water.…”

Section: Methodsmentioning

confidence: 99%

Longitudinal Versus Lateral Estuarine Dynamics and Their Role in Tidal Stratification Patterns in Lower South San Francisco Bay

et al. 2019

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The dynamics of shoal‐channel estuaries require consideration of lateral gradients and transport, which can create significant intratidal variability in stratification and circulation. When the shoal‐channel system is strongly coupled by tidal exchange with mudflats, marshes, or other habitats, the gradients driving intratidal stratification variations are expected to intensify. To examine this dynamic, hydrodynamic data were collected from 27 January 2017 to 10 February 2017 in Lower South San Francisco Bay, a small subembayment fringed by extensive shallow vegetated habitats. During this deployment, salinity variations were captured through instrumentation of six stations (arrayed longitudinally and laterally) allowing for mechanisms of stratification creation and destruction to be calculated directly and compared with observed time variability of stratification at the central station. We present observation‐based calculations of longitudinal straining, longitudinal advection, lateral straining, and lateral advection. The time dependence of stratification was observed directly and calculated by summing measured longitudinal and lateral mechanisms. We found that the stratification dynamics switch between being longitudinally dominated during the middle of ebb and flood tides to being laterally dominated during the tidal transitions. This variability is driven by the interplay between tidally variable lateral density gradients and turbulent mixing. Relatively constant along‐estuary density gradients are differentially advected during flood and ebb tides, resulting in maximal lateral density gradients around tidal transitions. Simultaneous decrease in turbulent mixing at slack tides allows lateral density‐driven exchange to stratify the estuary channel at the slack after flood. At the end of ebb, barotropic forcing drives negatively buoyant shoal waters toward the channel.

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2005 hydrographic survey of south San Francisco Bay, California

Cited by 4 publications

References 0 publications

Topobathymetric Elevation Model Development using a New Methodology: Coastal National Elevation Database

Topobathymetric Elevation Model Development using a New Methodology: Coastal National Elevation Database

Three-Dimensional Modeling of Hydrodynamics and Salinity in the San Francisco Estuary: An Evaluation of Model Accuracy, X2, and the Low-Salinity Zone

Longitudinal Versus Lateral Estuarine Dynamics and Their Role in Tidal Stratification Patterns in Lower South San Francisco Bay

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