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Theresa Fregoso (Former Employee)

Science and Products

San Francisco Bay, California, consists of several subembayments. North Bay consists of Honker, Suisun, and Grizzly Bays.

San Francisco Bay Bathymetry

Bathymetry of a dynamic tidal estuary, such as San Francisco Bay, provides the observable linkage between anthropogenic modifications of the landscape—such as evolving land use practices, flood control, and water diversions—and natural forces of climate-driven river flow, sea level change, tides, and wind. By examining our record of hydrographic surveys, spanning over 150 years, we can gain...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, San Francisco Bay and Sacramento-San Joaquin Delta Estuary
San Francisco Bay Bathymetry

San Francisco Bay Bathymetry

Bathymetry of a dynamic tidal estuary, such as San Francisco Bay, provides the observable linkage between anthropogenic modifications of the landscape—such as evolving land use practices, flood control, and water diversions—and natural forces of climate-driven river flow, sea level change, tides, and wind. By examining our record of hydrographic surveys, spanning over 150 years, we can gain...
Learn More
Illustration showing the contours of the bay floor underwater and the relief of surrounding hills, and dots.

San Francisco Bay geomorphology

The primary objective of this task is to develop tools for predicting the long-term geomorphic evolution of estuaries. Sediment core and historical change analysis will be used in combination with interpretation of high-resolution seismic profiles to develop tools for predicting geomorphic evolution of estuaries. Historical change analysis will use hydrographic and lidar data. Longer-term data...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Core Preparation and Analysis Laboratory and Sample Repositories, Multi-Sensor Core Logger Laboratory
San Francisco Bay geomorphology

San Francisco Bay geomorphology

The primary objective of this task is to develop tools for predicting the long-term geomorphic evolution of estuaries. Sediment core and historical change analysis will be used in combination with interpretation of high-resolution seismic profiles to develop tools for predicting geomorphic evolution of estuaries. Historical change analysis will use hydrographic and lidar data. Longer-term data...
Learn More
Filter Total Items: 15

Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016 Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016

The sediment core data presented here were compiled for use in a project studying the amount of sand either released from or stored within the bed sediments of San Francisco Bay, California from the 1980s to 2010s. Estimates of the change in sand storage in the bed sediments could be used in larger San Francisco Bay sand budget and transports studies as well as to inform management...
By
Pacific Coastal and Marine Science Center

Historical bathymetry and bathymetric change within San Francisco Bay, California: 1855 to 2005 Historical bathymetry and bathymetric change within San Francisco Bay, California: 1855 to 2005

Here we present a time series of San Francisco Bay bathymetric grids created from historical hydrographic surveys collected by the National Ocean Service (NOS) and its predecessor, the United States Coast and Geodetic Survey, from the 1850s to 1980s and one additional survey of south San Francisco Bay collected in 2005 by Sea Surveyor, Inc. Using surface modeling software, the soundings...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Global ferromanganese crust and abyssal ferromanganese nodule prospective occurrence regions Global ferromanganese crust and abyssal ferromanganese nodule prospective occurrence regions

This data release is a polygon shapefile representing prospective occurrence regions of ferromanganese crusts and abyssal ferromanganese nodules on the seafloor throughout the global oceans. Polygons represent areas where oceanographic criteria, such as low sedimentation rate and moderate primary productivity, overlap with geologic criteria, including regions with appropriate seafloor...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020 Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020

This data release supersedes version 1.0, published in April 2023 at https://doi.org/10.5066/P9Y5PEV0. Versioning details are documented in the accompanying SFBay_BathyChange_VersionHistory.txt file. This data release provides bathymetric change grids of four geographic areas of San Francisco Bay, California, comparing digital elevation models (DEMs) created from bathymetric data...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California

This data release contains information on 94 gravity cores and 3 box cores that were collected by the U.S. Geological Survey in the areas of Suisun, San Pablo, and San Francisco Bay, California in 1990 and 2000. PDF files describe the cores that were split for analysis, and another pdf file contains a core-log legend. In addition, a shapefile provides sample collection data.
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Prospective regions for marine minerals on the Alaska Outer Continental Shelf Prospective regions for marine minerals on the Alaska Outer Continental Shelf

This shapefile is of prospective regional outlines of where marine minerals may occur on the Alaska Outer Continental Shelf (OCS). Polygons were hand digitized based on a U.S. Geological Survey (USGS) data review that considers the state of knowledge regarding marine mineral occurrences within the Alaska OCS. This data release is a companion to the USGS Professional Paper, Gartman and...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center
Filter Total Items: 19

Coral reef protection may help avert risks to people, property, and economic activity caused by projected reef degradation Coral reef protection may help avert risks to people, property, and economic activity caused by projected reef degradation

Degradation of coral reefs over the past several decades has caused regional-scale erosion of the shallow seafloor that serves as a protective barrier against coastal hazards along southeast Florida, USA. How future change in coral reefs may affect coastal flooding, however, has been less attended than other factors contributing to increasing risks such as sea-level rise and more intense...
Authors
Curt D. Storlazzi, Borja Reguero, Kimberly Yates, Kristen Alkins, James B. Shope, Camila Gaido-Lasserre, Theresa Fregoso, Michael W. Beck
By
Pacific Coastal and Marine Science Center

Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s

This study by the U.S. Geological Survey (USGS) provides estimates of the change in sand storage in bed sediments from the 1980s to 2010s in the San Francisco Bay area, California. The study is part of a larger project called “Research to Understand Impacts of Bay Sand Mining on Sand Transport in San Francisco Bay and the Outer Coast” that has the goal of providing information for the...
Authors
Theresa A. Fregoso, Bruce E. Jaffe, Amy C. Foxgrover, Donald L. Woodrow, Bethany Kharrazi, Kevin Orzech
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA

Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA
Authors
M.A. Malkowski, Z.T. Sickmann, Theresa A. Fregoso, Lester McKee, D. Stockli, Bruce E. Jaffe
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Successful hindcast of 7 years of mud morphodynamics influenced by salt pond restoration in south San Francisco Bay Successful hindcast of 7 years of mud morphodynamics influenced by salt pond restoration in south San Francisco Bay

Alviso Slough in South San Francisco Bay has been experiencing restoration of adjacent former salt-production ponds into muted tidal ponds, tidal ponds, and salt marsh. As a result, tidal prism through Alviso Slough has increased and mercury-contaminated sediment has been remobilized. We developed a 2D, high-resolution, process-based model (Delft3D FM-wave) to hindcast observed morpho...
Authors
Mick Van der Wegen, Johan Reyns, Bruce E. Jaffe, Amy C. Foxgrover, Fernanda Achete, Mark C. Marvin-DiPasquale, Theresa A. Fregoso, Judy Nam, Jessica Lovering
By
Pacific Coastal and Marine Science Center

Observations and morphodynamic modeling of decadal-scale morphologic change in estuaries under sea level rise Observations and morphodynamic modeling of decadal-scale morphologic change in estuaries under sea level rise

Sea level rise is expected to affect coastal areas all around the world, including the estuarine environment. New bathymetry collected in 2014 provided a unique opportunity to test the modeling of Elmilady et al. (2019), who presented a morphodynamic DELFT3D model of San Pablo Bay, California, that included detailed tidal water movement, wind-wave action, sediment transport, and...
Authors
Bruce E. Jaffe, Hesham Elmilady, Mick Van der Wegen, Theresa A. Fregoso
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Sediment deposition, erosion, and bathymetric change in San Francisco Bay, California, 1971–1990 and 1999–2020 Sediment deposition, erosion, and bathymetric change in San Francisco Bay, California, 1971–1990 and 1999–2020

Bathymetric change analyses document historical patterns of sediment deposition and erosion, providing valuable insight into the sediment dynamics of coastal systems, including pathways of sediment and sediment-bound contaminants. In 2014 and 2015, the Office for Coastal Management, in partnership with the National Oceanic and Atmospheric Administration (NOAA) Office of Coastal...
Authors
Theresa A. Fregoso, Amy C. Foxgrover, Bruce E. Jaffe
By
Pacific Coastal and Marine Science Center
Shifting Sand-Supply Dynamics in San Francisco Bay

Shifting Sand-Supply Dynamics in San Francisco Bay

Coastal communities around large estuaries like San Francisco Bay are threatened by increasing erosion due to sea-level rise and anthropogenic...

Read Article
Bathymetric Data Tracks Sediment Flux in San Francisco Bay

Bathymetric Data Tracks Sediment Flux in San Francisco Bay

New detailed analysis of bathymetric digital elevation models (DEMs) spanning much of San Francisco Bay reveals a net loss of sediment since the 1980s...

Read Article

Science and Products

San Francisco Bay, California, consists of several subembayments. North Bay consists of Honker, Suisun, and Grizzly Bays.

San Francisco Bay Bathymetry

Bathymetry of a dynamic tidal estuary, such as San Francisco Bay, provides the observable linkage between anthropogenic modifications of the landscape—such as evolving land use practices, flood control, and water diversions—and natural forces of climate-driven river flow, sea level change, tides, and wind. By examining our record of hydrographic surveys, spanning over 150 years, we can gain...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, San Francisco Bay and Sacramento-San Joaquin Delta Estuary
San Francisco Bay Bathymetry

San Francisco Bay Bathymetry

Bathymetry of a dynamic tidal estuary, such as San Francisco Bay, provides the observable linkage between anthropogenic modifications of the landscape—such as evolving land use practices, flood control, and water diversions—and natural forces of climate-driven river flow, sea level change, tides, and wind. By examining our record of hydrographic surveys, spanning over 150 years, we can gain...
Learn More
Illustration showing the contours of the bay floor underwater and the relief of surrounding hills, and dots.

San Francisco Bay geomorphology

The primary objective of this task is to develop tools for predicting the long-term geomorphic evolution of estuaries. Sediment core and historical change analysis will be used in combination with interpretation of high-resolution seismic profiles to develop tools for predicting geomorphic evolution of estuaries. Historical change analysis will use hydrographic and lidar data. Longer-term data...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Core Preparation and Analysis Laboratory and Sample Repositories, Multi-Sensor Core Logger Laboratory
San Francisco Bay geomorphology

San Francisco Bay geomorphology

The primary objective of this task is to develop tools for predicting the long-term geomorphic evolution of estuaries. Sediment core and historical change analysis will be used in combination with interpretation of high-resolution seismic profiles to develop tools for predicting geomorphic evolution of estuaries. Historical change analysis will use hydrographic and lidar data. Longer-term data...
Learn More
Filter Total Items: 15

Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016 Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016

The sediment core data presented here were compiled for use in a project studying the amount of sand either released from or stored within the bed sediments of San Francisco Bay, California from the 1980s to 2010s. Estimates of the change in sand storage in the bed sediments could be used in larger San Francisco Bay sand budget and transports studies as well as to inform management...
By
Pacific Coastal and Marine Science Center

Historical bathymetry and bathymetric change within San Francisco Bay, California: 1855 to 2005 Historical bathymetry and bathymetric change within San Francisco Bay, California: 1855 to 2005

Here we present a time series of San Francisco Bay bathymetric grids created from historical hydrographic surveys collected by the National Ocean Service (NOS) and its predecessor, the United States Coast and Geodetic Survey, from the 1850s to 1980s and one additional survey of south San Francisco Bay collected in 2005 by Sea Surveyor, Inc. Using surface modeling software, the soundings...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Global ferromanganese crust and abyssal ferromanganese nodule prospective occurrence regions Global ferromanganese crust and abyssal ferromanganese nodule prospective occurrence regions

This data release is a polygon shapefile representing prospective occurrence regions of ferromanganese crusts and abyssal ferromanganese nodules on the seafloor throughout the global oceans. Polygons represent areas where oceanographic criteria, such as low sedimentation rate and moderate primary productivity, overlap with geologic criteria, including regions with appropriate seafloor...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020 Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020

This data release supersedes version 1.0, published in April 2023 at https://doi.org/10.5066/P9Y5PEV0. Versioning details are documented in the accompanying SFBay_BathyChange_VersionHistory.txt file. This data release provides bathymetric change grids of four geographic areas of San Francisco Bay, California, comparing digital elevation models (DEMs) created from bathymetric data...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California

This data release contains information on 94 gravity cores and 3 box cores that were collected by the U.S. Geological Survey in the areas of Suisun, San Pablo, and San Francisco Bay, California in 1990 and 2000. PDF files describe the cores that were split for analysis, and another pdf file contains a core-log legend. In addition, a shapefile provides sample collection data.
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Prospective regions for marine minerals on the Alaska Outer Continental Shelf Prospective regions for marine minerals on the Alaska Outer Continental Shelf

This shapefile is of prospective regional outlines of where marine minerals may occur on the Alaska Outer Continental Shelf (OCS). Polygons were hand digitized based on a U.S. Geological Survey (USGS) data review that considers the state of knowledge regarding marine mineral occurrences within the Alaska OCS. This data release is a companion to the USGS Professional Paper, Gartman and...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center
Filter Total Items: 19

Coral reef protection may help avert risks to people, property, and economic activity caused by projected reef degradation Coral reef protection may help avert risks to people, property, and economic activity caused by projected reef degradation

Degradation of coral reefs over the past several decades has caused regional-scale erosion of the shallow seafloor that serves as a protective barrier against coastal hazards along southeast Florida, USA. How future change in coral reefs may affect coastal flooding, however, has been less attended than other factors contributing to increasing risks such as sea-level rise and more intense...
Authors
Curt D. Storlazzi, Borja Reguero, Kimberly Yates, Kristen Alkins, James B. Shope, Camila Gaido-Lasserre, Theresa Fregoso, Michael W. Beck
By
Pacific Coastal and Marine Science Center

Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s

This study by the U.S. Geological Survey (USGS) provides estimates of the change in sand storage in bed sediments from the 1980s to 2010s in the San Francisco Bay area, California. The study is part of a larger project called “Research to Understand Impacts of Bay Sand Mining on Sand Transport in San Francisco Bay and the Outer Coast” that has the goal of providing information for the...
Authors
Theresa A. Fregoso, Bruce E. Jaffe, Amy C. Foxgrover, Donald L. Woodrow, Bethany Kharrazi, Kevin Orzech
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA

Reversal in estuarine sand supply driven by Holocene sea level rise: A model for sand transport in large structural estuaries, San Francisco Bay, California, USA
Authors
M.A. Malkowski, Z.T. Sickmann, Theresa A. Fregoso, Lester McKee, D. Stockli, Bruce E. Jaffe
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Successful hindcast of 7 years of mud morphodynamics influenced by salt pond restoration in south San Francisco Bay Successful hindcast of 7 years of mud morphodynamics influenced by salt pond restoration in south San Francisco Bay

Alviso Slough in South San Francisco Bay has been experiencing restoration of adjacent former salt-production ponds into muted tidal ponds, tidal ponds, and salt marsh. As a result, tidal prism through Alviso Slough has increased and mercury-contaminated sediment has been remobilized. We developed a 2D, high-resolution, process-based model (Delft3D FM-wave) to hindcast observed morpho...
Authors
Mick Van der Wegen, Johan Reyns, Bruce E. Jaffe, Amy C. Foxgrover, Fernanda Achete, Mark C. Marvin-DiPasquale, Theresa A. Fregoso, Judy Nam, Jessica Lovering
By
Pacific Coastal and Marine Science Center

Observations and morphodynamic modeling of decadal-scale morphologic change in estuaries under sea level rise Observations and morphodynamic modeling of decadal-scale morphologic change in estuaries under sea level rise

Sea level rise is expected to affect coastal areas all around the world, including the estuarine environment. New bathymetry collected in 2014 provided a unique opportunity to test the modeling of Elmilady et al. (2019), who presented a morphodynamic DELFT3D model of San Pablo Bay, California, that included detailed tidal water movement, wind-wave action, sediment transport, and...
Authors
Bruce E. Jaffe, Hesham Elmilady, Mick Van der Wegen, Theresa A. Fregoso
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center

Sediment deposition, erosion, and bathymetric change in San Francisco Bay, California, 1971–1990 and 1999–2020 Sediment deposition, erosion, and bathymetric change in San Francisco Bay, California, 1971–1990 and 1999–2020

Bathymetric change analyses document historical patterns of sediment deposition and erosion, providing valuable insight into the sediment dynamics of coastal systems, including pathways of sediment and sediment-bound contaminants. In 2014 and 2015, the Office for Coastal Management, in partnership with the National Oceanic and Atmospheric Administration (NOAA) Office of Coastal...
Authors
Theresa A. Fregoso, Amy C. Foxgrover, Bruce E. Jaffe
By
Pacific Coastal and Marine Science Center
Shifting Sand-Supply Dynamics in San Francisco Bay

Shifting Sand-Supply Dynamics in San Francisco Bay

Coastal communities around large estuaries like San Francisco Bay are threatened by increasing erosion due to sea-level rise and anthropogenic...

Read Article
Bathymetric Data Tracks Sediment Flux in San Francisco Bay

Bathymetric Data Tracks Sediment Flux in San Francisco Bay

New detailed analysis of bathymetric digital elevation models (DEMs) spanning much of San Francisco Bay reveals a net loss of sediment since the 1980s...

Read Article
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