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David Zawada, Ph.D. (Former Employee)

Science and Products

Along-Track Reef Imaging System

Along-Track Reef Imaging System (ATRIS)

ATRIS is a benthic-survey tool that simultaneously acquires geo-located, color, digital images with corresponding water depths.
By
St. Petersburg Coastal and Marine Science Center
Along-Track Reef Imaging System (ATRIS)

Along-Track Reef Imaging System (ATRIS)

ATRIS is a benthic-survey tool that simultaneously acquires geo-located, color, digital images with corresponding water depths.
Learn More
bathymetry plotted in 3D

Advanced Remote Sensing Methods for Coastal Science and Management

This project focused on developing algorithms for quantifying benthic habitat complexity from images, modeling the structural complexity of the seafloor, and using fluorescence signatures to classify coral reef habitats.
By
St. Petersburg Coastal and Marine Science Center
Advanced Remote Sensing Methods for Coastal Science and Management

Advanced Remote Sensing Methods for Coastal Science and Management

This project focused on developing algorithms for quantifying benthic habitat complexity from images, modeling the structural complexity of the seafloor, and using fluorescence signatures to classify coral reef habitats.
Learn More
Filter Total Items: 57

Overlapping seabed images and location data acquired using the SQUID-5 system at Eastern Dry Rocks coral reef, Florida, in May 2021, with derived point cloud, digital elevation model and orthomosaic of submerged topography Overlapping seabed images and location data acquired using the SQUID-5 system at Eastern Dry Rocks coral reef, Florida, in May 2021, with derived point cloud, digital elevation model and orthomosaic of submerged topography

Underwater images were collected using a towed-surface vehicle with multiple downward-looking underwater cameras developed by the U.S. Geological Survey (USGS). The system is named the Structure-from-Motion (SfM) Quantitative Underwater Imaging Device with Five Cameras (SQUID-5). The raw images and associated navigation data were collected at Eastern Dry Rocks, a coral reef located...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center

Seafloor Elevation and Volume Change Analyses from 2016 to 2019 Along the Florida Reef Tract, USA Seafloor Elevation and Volume Change Analyses from 2016 to 2019 Along the Florida Reef Tract, USA

The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted research to quantify bathymetric changes along the Florida Reef Tract (FRT) from Miami to Key West within a 939.4 square-kilometer area. USGS staff calculated changes in seafloor elevation and volume from 2016 to 2019 using light detection and ranging (lidar)-derived digital elevation models...
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Flooding extent polygons for modelled wave-driven water levels in Florida with and without projected coral reef degradation Flooding extent polygons for modelled wave-driven water levels in Florida with and without projected coral reef degradation

This data release presents projected flooding extent polygon (flood masks) shapefiles based on wave-driven total water levels for the State Florida (the Florida Peninsula and the Florida Keys). There are 12 associated flood mask shapefiles: one for each of four nearshore wave energy return periods (rp; 10-, 50-, 100-, and 500-years), the current scenario (base) and each of the...
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Hurricanes

Multi-grid Analysis of Point Stability Tool Multi-grid Analysis of Point Stability Tool

Elevation-change datasets can also be used to identify stable and unstable areas of the seafloor. The Multi-grid Analysis of Point Stability (MAPS) program was created to automate this process. This program is used to locate persistent areas of user-defined seafloor stability and/or instability at common geographic locations from multiple elevation-change datasets (grids) representing...
By
St. Petersburg Coastal and Marine Science Center

Seafloor Elevation Change Analysis Tool Seafloor Elevation Change Analysis Tool

The Seafloor Elevation Change Analysis Tool (SECAT) is a Python script intended to be run as a script tool by ArcMap or ArcGIS Pro that automates their intricate methodology.
By
St. Petersburg Coastal and Marine Science Center

Seafloor Elevation Change From 2002 to 2016 in the Upper Florida Keys Seafloor Elevation Change From 2002 to 2016 in the Upper Florida Keys

The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted research to quantify bathymetric changes in the Upper Florida Keys (UFK) from Triumph Reef to Pickles Reef within a 242.4 square-kilometer area. USGS staff calculated changes in seafloor elevation from 2002 to 2016 using light detection and ranging (lidar)-derived data acquired by the USGS in...
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center
No results found.
Filter Total Items: 27

Hydrodynamics and sediment mobility processes over a degraded senile coral reef Hydrodynamics and sediment mobility processes over a degraded senile coral reef

Coral reefs can influence hydrodynamics and morphodynamics by dissipating and refracting incident wave energy, modifying circulation patterns, and altering sediment transport pathways. In this study, the sediment and hydrodynamic response of a senile (dead) barrier reef (Crocker Reef, located in the upper portion of the Florida Reef Tract) to storms and quiescent conditions was evaluated...
Authors
Legna M. Torres-Garcia, P. Soupy Dalyander, Joseph W. Long, David G. Zawada, Kimberly K. Yates, Christopher Moore, Maitane Olabarrieta
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Divergence of seafloor elevation and sea level rise in coral reef ecosystems Divergence of seafloor elevation and sea level rise in coral reef ecosystems

Coral reefs serve as natural barriers that protect adjacent shorelines from coastal hazards such as storms, waves, and erosion. Projections indicate global degradation of coral reefs due to anthropogenic impacts and climate change will cause a transition to net erosion by mid-century. Here, we provide a comprehensive assessment of the combined effect of all of the processes affecting...
Authors
Kimberly K. Yates, David G. Zawada, Nathan A. Smiley, Ginger Tiling-Range
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center, Supplemental Appropriations for Disaster Recovery Activities

USGS research on Atlantic coral reef ecosystems USGS research on Atlantic coral reef ecosystems

Overview Coral reefs are massive, biomineralized structures that protect coastal communities by acting as barriers to hazards such as hurricanes and tsunamis. They provide sand for beaches through the natural process of erosion, support tourism and recreational industries, and provide essential habitat for fisheries. The continuing global degradation of coral reef ecosystems is well...
Authors
Ilsa B. Kuffner, Kimberly K. Yates, David G. Zawada, Julie N. Richey, Christina A. Kellogg, Lauren T. Toth
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico

Información General Los arrecifes de coral son estructuras sólidas, biomineralizadas que protegen comunidades costeras actuando como barreras protectoras de peligros tales como los huracanes y los tsunamis. Estos proveen arena a las playas a través de procesos naturales de erosión, fomentan la industria del turismo, las actividades recreacionales y proveen hábitats pesqueros esenciales...
Authors
Ilsa B. Kuffner, Kimberly K. Yates, David G. Zawada, Julie N. Richey, Christina A. Kellogg, Lauren T. Toth, Legna M. Torres-Garcia
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

A comparison between boat-based and diver-based methods for quantifying coral bleaching A comparison between boat-based and diver-based methods for quantifying coral bleaching

Recent increases in both the frequency and severity of coral bleaching events have spurred numerous surveys to quantify the immediate impacts and monitor the subsequent community response. Most of these efforts utilize conventional diver-based methods, which are inherently time-consuming, expensive, and limited in spatial scope unless they deploy large teams of scientifically-trained...
Authors
David G. Zawada, Rob Ruzicka, Michael A. Colella
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Breeding loggerhead marine turtles Caretta caretta in Dry Tortugas National Park, USA, show high fidelity to diverse habitats near nesting beaches Breeding loggerhead marine turtles Caretta caretta in Dry Tortugas National Park, USA, show high fidelity to diverse habitats near nesting beaches

We used satellite telemetry to identify in-water habitat used by individuals in the smallest North-west Atlantic subpopulation of adult nesting loggerhead turtles Caretta caretta during the breeding season. During 2010, 2011 and 2012 breeding periods, a total of 20 adult females used habitats proximal to nesting beaches with various levels of protection within Dry Tortugas National Park...
Authors
Kristen M. Hart, David G. Zawada, Autumn R. Sartain-Iverson, Ikuko Fujisaki
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Science and Products

Along-Track Reef Imaging System

Along-Track Reef Imaging System (ATRIS)

ATRIS is a benthic-survey tool that simultaneously acquires geo-located, color, digital images with corresponding water depths.
By
St. Petersburg Coastal and Marine Science Center
Along-Track Reef Imaging System (ATRIS)

Along-Track Reef Imaging System (ATRIS)

ATRIS is a benthic-survey tool that simultaneously acquires geo-located, color, digital images with corresponding water depths.
Learn More
bathymetry plotted in 3D

Advanced Remote Sensing Methods for Coastal Science and Management

This project focused on developing algorithms for quantifying benthic habitat complexity from images, modeling the structural complexity of the seafloor, and using fluorescence signatures to classify coral reef habitats.
By
St. Petersburg Coastal and Marine Science Center
Advanced Remote Sensing Methods for Coastal Science and Management

Advanced Remote Sensing Methods for Coastal Science and Management

This project focused on developing algorithms for quantifying benthic habitat complexity from images, modeling the structural complexity of the seafloor, and using fluorescence signatures to classify coral reef habitats.
Learn More
Filter Total Items: 57

Overlapping seabed images and location data acquired using the SQUID-5 system at Eastern Dry Rocks coral reef, Florida, in May 2021, with derived point cloud, digital elevation model and orthomosaic of submerged topography Overlapping seabed images and location data acquired using the SQUID-5 system at Eastern Dry Rocks coral reef, Florida, in May 2021, with derived point cloud, digital elevation model and orthomosaic of submerged topography

Underwater images were collected using a towed-surface vehicle with multiple downward-looking underwater cameras developed by the U.S. Geological Survey (USGS). The system is named the Structure-from-Motion (SfM) Quantitative Underwater Imaging Device with Five Cameras (SQUID-5). The raw images and associated navigation data were collected at Eastern Dry Rocks, a coral reef located...
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center

Seafloor Elevation and Volume Change Analyses from 2016 to 2019 Along the Florida Reef Tract, USA Seafloor Elevation and Volume Change Analyses from 2016 to 2019 Along the Florida Reef Tract, USA

The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted research to quantify bathymetric changes along the Florida Reef Tract (FRT) from Miami to Key West within a 939.4 square-kilometer area. USGS staff calculated changes in seafloor elevation and volume from 2016 to 2019 using light detection and ranging (lidar)-derived digital elevation models...
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Flooding extent polygons for modelled wave-driven water levels in Florida with and without projected coral reef degradation Flooding extent polygons for modelled wave-driven water levels in Florida with and without projected coral reef degradation

This data release presents projected flooding extent polygon (flood masks) shapefiles based on wave-driven total water levels for the State Florida (the Florida Peninsula and the Florida Keys). There are 12 associated flood mask shapefiles: one for each of four nearshore wave energy return periods (rp; 10-, 50-, 100-, and 500-years), the current scenario (base) and each of the...
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Hurricanes

Multi-grid Analysis of Point Stability Tool Multi-grid Analysis of Point Stability Tool

Elevation-change datasets can also be used to identify stable and unstable areas of the seafloor. The Multi-grid Analysis of Point Stability (MAPS) program was created to automate this process. This program is used to locate persistent areas of user-defined seafloor stability and/or instability at common geographic locations from multiple elevation-change datasets (grids) representing...
By
St. Petersburg Coastal and Marine Science Center

Seafloor Elevation Change Analysis Tool Seafloor Elevation Change Analysis Tool

The Seafloor Elevation Change Analysis Tool (SECAT) is a Python script intended to be run as a script tool by ArcMap or ArcGIS Pro that automates their intricate methodology.
By
St. Petersburg Coastal and Marine Science Center

Seafloor Elevation Change From 2002 to 2016 in the Upper Florida Keys Seafloor Elevation Change From 2002 to 2016 in the Upper Florida Keys

The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted research to quantify bathymetric changes in the Upper Florida Keys (UFK) from Triumph Reef to Pickles Reef within a 242.4 square-kilometer area. USGS staff calculated changes in seafloor elevation from 2002 to 2016 using light detection and ranging (lidar)-derived data acquired by the USGS in...
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center
No results found.
Filter Total Items: 27

Hydrodynamics and sediment mobility processes over a degraded senile coral reef Hydrodynamics and sediment mobility processes over a degraded senile coral reef

Coral reefs can influence hydrodynamics and morphodynamics by dissipating and refracting incident wave energy, modifying circulation patterns, and altering sediment transport pathways. In this study, the sediment and hydrodynamic response of a senile (dead) barrier reef (Crocker Reef, located in the upper portion of the Florida Reef Tract) to storms and quiescent conditions was evaluated...
Authors
Legna M. Torres-Garcia, P. Soupy Dalyander, Joseph W. Long, David G. Zawada, Kimberly K. Yates, Christopher Moore, Maitane Olabarrieta
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Divergence of seafloor elevation and sea level rise in coral reef ecosystems Divergence of seafloor elevation and sea level rise in coral reef ecosystems

Coral reefs serve as natural barriers that protect adjacent shorelines from coastal hazards such as storms, waves, and erosion. Projections indicate global degradation of coral reefs due to anthropogenic impacts and climate change will cause a transition to net erosion by mid-century. Here, we provide a comprehensive assessment of the combined effect of all of the processes affecting...
Authors
Kimberly K. Yates, David G. Zawada, Nathan A. Smiley, Ginger Tiling-Range
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center, Supplemental Appropriations for Disaster Recovery Activities

USGS research on Atlantic coral reef ecosystems USGS research on Atlantic coral reef ecosystems

Overview Coral reefs are massive, biomineralized structures that protect coastal communities by acting as barriers to hazards such as hurricanes and tsunamis. They provide sand for beaches through the natural process of erosion, support tourism and recreational industries, and provide essential habitat for fisheries. The continuing global degradation of coral reef ecosystems is well...
Authors
Ilsa B. Kuffner, Kimberly K. Yates, David G. Zawada, Julie N. Richey, Christina A. Kellogg, Lauren T. Toth
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico

Información General Los arrecifes de coral son estructuras sólidas, biomineralizadas que protegen comunidades costeras actuando como barreras protectoras de peligros tales como los huracanes y los tsunamis. Estos proveen arena a las playas a través de procesos naturales de erosión, fomentan la industria del turismo, las actividades recreacionales y proveen hábitats pesqueros esenciales...
Authors
Ilsa B. Kuffner, Kimberly K. Yates, David G. Zawada, Julie N. Richey, Christina A. Kellogg, Lauren T. Toth, Legna M. Torres-Garcia
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

A comparison between boat-based and diver-based methods for quantifying coral bleaching A comparison between boat-based and diver-based methods for quantifying coral bleaching

Recent increases in both the frequency and severity of coral bleaching events have spurred numerous surveys to quantify the immediate impacts and monitor the subsequent community response. Most of these efforts utilize conventional diver-based methods, which are inherently time-consuming, expensive, and limited in spatial scope unless they deploy large teams of scientifically-trained...
Authors
David G. Zawada, Rob Ruzicka, Michael A. Colella
By
Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center

Breeding loggerhead marine turtles Caretta caretta in Dry Tortugas National Park, USA, show high fidelity to diverse habitats near nesting beaches Breeding loggerhead marine turtles Caretta caretta in Dry Tortugas National Park, USA, show high fidelity to diverse habitats near nesting beaches

We used satellite telemetry to identify in-water habitat used by individuals in the smallest North-west Atlantic subpopulation of adult nesting loggerhead turtles Caretta caretta during the breeding season. During 2010, 2011 and 2012 breeding periods, a total of 20 adult females used habitats proximal to nesting beaches with various levels of protection within Dry Tortugas National Park...
Authors
Kristen M. Hart, David G. Zawada, Autumn R. Sartain-Iverson, Ikuko Fujisaki
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government

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