Joseph Long (Former Employee)
Science and Products
Filter Total Items: 13
Online Merging and Gridding of Topographic and Bathymetric Data Sources
Digital Elevation Models (DEM) provide details of the earth’s surface and are used for visualization, physical modeling, and elevation change analysis. Creating DEMs in coastal environments is complicated by the highly ephemeral nature of the coast and the need to span the land-water interface. This requires merging multiple bathymetric and topographic datasets that have been collected...
Filter Total Items: 17
EAARL Coastal Topography-Louisiana, Alabama, and Florida, 2008: First Return Elevation Data EAARL Coastal Topography-Louisiana, Alabama, and Florida, 2008: First Return Elevation Data
This dataset, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provides first and last return elevation data collected during a June 24, 2008 airborne lidar survey for the Chandeleur Islands, LA, Dauphin Island, AL, Santa Rosa Island, FL, and Bon Secour, AL. Elevation measurements were collected over the area using the National Aeronautics and...
EAARL Coastal Topography-Louisiana, Mississippi and Alabama, September 2006: First and Last Return Elevation Data EAARL Coastal Topography-Louisiana, Mississippi and Alabama, September 2006: First and Last Return Elevation Data
This dataset, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provides first and last return elevation data collected during a September 20-22, 2006 airborne lidar survey for the Chandeleur Islands, Louisiana, and Cat Island, Mississippi, through Dauphin Island, Alabama. Elevation measurements were collected over the area using the National...
EAARL Coastal Topography-Dauphin Island, Post-Hurricane Katrina, 2005 EAARL Coastal Topography-Dauphin Island, Post-Hurricane Katrina, 2005
These datasets, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provide lidar-derived first-surface and bare-earth topography for Dauphin Island, Alabama. Elevation measurements were acquired by the Experimental Advanced Airborne Research Lidar (EAARL) during September 2005, immediately following Hurricane Katrina landfall.
EAARL Coastal Topography-Dauphin Island, 2010 EAARL Coastal Topography-Dauphin Island, 2010
These datasets, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provide lidar-derived first-surface and bare-earth topography for Dauphin Island, Alabama. Elevation measurements were acquired by the Experimental Advanced Airborne Research Lidar (EAARL) on July 24, 2010, one day before remnants from the dissipated Tropical Storm Bonnie came ashore.
Beach Slopes of North Carolina: Salvo to Duck Beach Slopes of North Carolina: Salvo to Duck
The National Assessment of Coastal Change Hazards project derives features of beach morphology from lidar elevation data for the purpose of understanding and predicting storm impacts to our nation\'s coastlines. This dataset defines mean beach slopes along the United States Southeast Atlantic Ocean from Salvo to Duck, North Carolina for data collected at various times between 1996 and...
Filter Total Items: 46
Toward a national coastal hazard forecast of total water levels Toward a national coastal hazard forecast of total water levels
Storm surge and large waves combine to erode beaches, cause marsh and coral decay, and inundate low-elevation areas, resulting in hazards to coastal communities and loss of natural resources. The USGS, in collaboration with NOAA, is developing a real-time system to provide ∼ 6-day forecasts of total water levels (TWLs) combining tides, storm surge, and wave runup. TWL is compared with...
Authors
Alfredo Aretxabaleta, Kara Doran, Joseph Long, Li Erikson
Surrogate model development for coastal dune erosion under storm conditions Surrogate model development for coastal dune erosion under storm conditions
Early coastal dune erosion predictions are essential to avoid potential flood consequences but most dune erosion numerical models are computationally expensive, hence their application in Early Warning Systems is limited. Here, based on a combination of optimally sampled synthetic sea storms with a calibrated and validated XBeach model, we develop a surrogate model capable of producing...
Authors
Victor Malagon-Santos, Thomas Wahl, Joseph Long, Davina Passeri, Nathaniel Plant
Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years
Dauphin Island and Little Dauphin Island, collectively, make up a geomorphically complex barrier island system located along Alabama’s southern coast, separating Mississippi Sound from the Gulf of Mexico and Mobile Bay. The barrier island system provides numerous economical (tourism, fisheries) and natural (habitat for migratory birds, natural protection of inland and coastal areas from...
Authors
Christopher Smith, Joseph W. Long, Rachel E. Henderson, Paul Nelson
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. Dalyander, Joseph W. Long, David G. Zawada, Kimberly Yates, Christopher Moore, Maitane Olabarrieta
Effects of proposed navigation channel improvements on sediment transport in Mobile Harbor, Alabama Effects of proposed navigation channel improvements on sediment transport in Mobile Harbor, Alabama
A Delft3D model was developed to evaluate the potential effects of proposed navigationchannel deepening and widening in Mobile Harbor, Alabama. The model performance wasassessed through comparisons of modeled and observed data of water levels, velocities, and bedlevel changes; the model captured hydrodynamic and sediment transport patterns in the studyarea with skill. The validated model...
Authors
Davina Passeri, Joseph W. Long, Robert L. Jenkins, David Thompson
Dynamic modeling of barrier island response to hurricane storm surge under future sea level rise Dynamic modeling of barrier island response to hurricane storm surge under future sea level rise
Sea level rise (SLR) has the potential to exacerbate the impacts of extreme storm events on the coastal landscape. This study examines the coupled interactions of SLR on storm-driven hydrodynamics and barrier island morphology. A numerical model is used to simulate the hydrodynamic and morphodynamic impacts of two Gulf of Mexico hurricanes under present-day and future sea levels. SLR...
Authors
Davina Passeri, Matthew Bilskie, Nathaniel Plant, Joseph W. Long, Scott Hagen
A framework for modeling scenario-based barrier island storm impacts A framework for modeling scenario-based barrier island storm impacts
Methods for investigating the vulnerability of existing or proposed coastal features to storm impacts often rely on simplified parametric models or one-dimensional process-based modeling studies that focus on changes to a profile across a dune or barrier island. These simple studies tend to neglect the impacts to curvilinear or alongshore varying island planforms, influence of non...
Authors
Rangley Mickey, Joseph W. Long, P. Dalyander, Nathaniel Plant, David Thompson
Laboratory observations of artificial sand and oil agglomerates Laboratory observations of artificial sand and oil agglomerates
Sand and oil agglomerates (SOAs) form when weathered oil reaches the surf zone and combines with suspended sediments. The presence of large SOAs in the form of thick mats (up to 10 centimeters [cm] in height and up to 10 square meters [m2] in area) and smaller SOAs, sometimes referred to as surface residual balls (SRBs), may lead to the re-oiling of beaches previously affected by an oil...
Authors
Robert L. Jenkins, P. Dalyander, Allison Penko, Joseph W. Long
The influence of bed friction variability due to land cover on storm-driven barrier island morphodynamics The influence of bed friction variability due to land cover on storm-driven barrier island morphodynamics
Variations in bed friction due to land cover type have the potential to influence morphologic change during storm events; the importance of these variations can be studied through numerical simulation and experimentation at locations with sufficient observational data to initialize realistic scenarios, evaluate model accuracy and guide interpretations. Two-dimensional in the horizontal...
Authors
Davina Passeri, Joseph Long, Nathaniel Plant, Matthew Bilskie, Scott Hagen
Correction of elevation offsets in multiple co-located lidar datasets Correction of elevation offsets in multiple co-located lidar datasets
IntroductionTopographic elevation data collected with airborne light detection and ranging (lidar) can be used to analyze short- and long-term changes to beach and dune systems. Analysis of multiple lidar datasets at Dauphin Island, Alabama, revealed systematic, island-wide elevation differences on the order of 10s of centimeters (cm) that were not attributable to real-world change and...
Authors
David Thompson, P. Soupy Dalyander, Joseph Long, Nathaniel Plant
A methodology for modeling barrier island storm-impact scenarios A methodology for modeling barrier island storm-impact scenarios
A methodology for developing a representative set of storm scenarios based on historical wave buoy and tide gauge data for a region at the Chandeleur Islands, Louisiana, was developed by the U.S. Geological Survey. The total water level was calculated for a 10-year period and analyzed against existing topographic data to identify when storm-induced wave action would affect island...
Authors
Rangley C. Mickey, Joseph Long, Nathaniel Plant, David Thompson, P. Dalyander
Testing model parameters for wave‐induced dune erosion using observations from Hurricane Sandy Testing model parameters for wave‐induced dune erosion using observations from Hurricane Sandy
Models of dune erosion depend on a set of assumptions that dictate the predicted evolution of dunes throughout the duration of a storm. Lidar observations made before and after Hurricane Sandy at over 800 profiles with diverse dune elevations, widths, and volumes are used to quantify specific dune erosion model parameters including the dune face slope, which controls dune avalanching...
Authors
Jacquelyn Overbeck, Joseph Long, Hilary Stockdon
Non-USGS Publications**
Long, J. W., and H. T. Özkan-Haller, 2009, Low-frequency characteristics of wave group–forced vortices, J. Geophys. Res., 114, C08004, doi:10.1029/2008JC004894.
Scott, C.P., Cox, D.T., Maddux, T.B., and Long, J.W., 2005, Large-scale laboratory observations of turbulence on a fixed barred beach: Measurement Science and Technology, v. 16, p. 1903, doi: 10.1088/0957-0233/16/10/004.
Long, J. W., and H. T. Özkan-Haller, 2005, Offshore controls on nearshore rip currents, J. Geophys. Res., 110, C12007, doi:10.1029/2005JC003018.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 13
Online Merging and Gridding of Topographic and Bathymetric Data Sources
Digital Elevation Models (DEM) provide details of the earth’s surface and are used for visualization, physical modeling, and elevation change analysis. Creating DEMs in coastal environments is complicated by the highly ephemeral nature of the coast and the need to span the land-water interface. This requires merging multiple bathymetric and topographic datasets that have been collected...
Filter Total Items: 17
EAARL Coastal Topography-Louisiana, Alabama, and Florida, 2008: First Return Elevation Data EAARL Coastal Topography-Louisiana, Alabama, and Florida, 2008: First Return Elevation Data
This dataset, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provides first and last return elevation data collected during a June 24, 2008 airborne lidar survey for the Chandeleur Islands, LA, Dauphin Island, AL, Santa Rosa Island, FL, and Bon Secour, AL. Elevation measurements were collected over the area using the National Aeronautics and...
EAARL Coastal Topography-Louisiana, Mississippi and Alabama, September 2006: First and Last Return Elevation Data EAARL Coastal Topography-Louisiana, Mississippi and Alabama, September 2006: First and Last Return Elevation Data
This dataset, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provides first and last return elevation data collected during a September 20-22, 2006 airborne lidar survey for the Chandeleur Islands, Louisiana, and Cat Island, Mississippi, through Dauphin Island, Alabama. Elevation measurements were collected over the area using the National...
EAARL Coastal Topography-Dauphin Island, Post-Hurricane Katrina, 2005 EAARL Coastal Topography-Dauphin Island, Post-Hurricane Katrina, 2005
These datasets, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provide lidar-derived first-surface and bare-earth topography for Dauphin Island, Alabama. Elevation measurements were acquired by the Experimental Advanced Airborne Research Lidar (EAARL) during September 2005, immediately following Hurricane Katrina landfall.
EAARL Coastal Topography-Dauphin Island, 2010 EAARL Coastal Topography-Dauphin Island, 2010
These datasets, prepared by the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, provide lidar-derived first-surface and bare-earth topography for Dauphin Island, Alabama. Elevation measurements were acquired by the Experimental Advanced Airborne Research Lidar (EAARL) on July 24, 2010, one day before remnants from the dissipated Tropical Storm Bonnie came ashore.
Beach Slopes of North Carolina: Salvo to Duck Beach Slopes of North Carolina: Salvo to Duck
The National Assessment of Coastal Change Hazards project derives features of beach morphology from lidar elevation data for the purpose of understanding and predicting storm impacts to our nation\'s coastlines. This dataset defines mean beach slopes along the United States Southeast Atlantic Ocean from Salvo to Duck, North Carolina for data collected at various times between 1996 and...
Filter Total Items: 46
Toward a national coastal hazard forecast of total water levels Toward a national coastal hazard forecast of total water levels
Storm surge and large waves combine to erode beaches, cause marsh and coral decay, and inundate low-elevation areas, resulting in hazards to coastal communities and loss of natural resources. The USGS, in collaboration with NOAA, is developing a real-time system to provide ∼ 6-day forecasts of total water levels (TWLs) combining tides, storm surge, and wave runup. TWL is compared with...
Authors
Alfredo Aretxabaleta, Kara Doran, Joseph Long, Li Erikson
Surrogate model development for coastal dune erosion under storm conditions Surrogate model development for coastal dune erosion under storm conditions
Early coastal dune erosion predictions are essential to avoid potential flood consequences but most dune erosion numerical models are computationally expensive, hence their application in Early Warning Systems is limited. Here, based on a combination of optimally sampled synthetic sea storms with a calibrated and validated XBeach model, we develop a surrogate model capable of producing...
Authors
Victor Malagon-Santos, Thomas Wahl, Joseph Long, Davina Passeri, Nathaniel Plant
Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years
Dauphin Island and Little Dauphin Island, collectively, make up a geomorphically complex barrier island system located along Alabama’s southern coast, separating Mississippi Sound from the Gulf of Mexico and Mobile Bay. The barrier island system provides numerous economical (tourism, fisheries) and natural (habitat for migratory birds, natural protection of inland and coastal areas from...
Authors
Christopher Smith, Joseph W. Long, Rachel E. Henderson, Paul Nelson
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. Dalyander, Joseph W. Long, David G. Zawada, Kimberly Yates, Christopher Moore, Maitane Olabarrieta
Effects of proposed navigation channel improvements on sediment transport in Mobile Harbor, Alabama Effects of proposed navigation channel improvements on sediment transport in Mobile Harbor, Alabama
A Delft3D model was developed to evaluate the potential effects of proposed navigationchannel deepening and widening in Mobile Harbor, Alabama. The model performance wasassessed through comparisons of modeled and observed data of water levels, velocities, and bedlevel changes; the model captured hydrodynamic and sediment transport patterns in the studyarea with skill. The validated model...
Authors
Davina Passeri, Joseph W. Long, Robert L. Jenkins, David Thompson
Dynamic modeling of barrier island response to hurricane storm surge under future sea level rise Dynamic modeling of barrier island response to hurricane storm surge under future sea level rise
Sea level rise (SLR) has the potential to exacerbate the impacts of extreme storm events on the coastal landscape. This study examines the coupled interactions of SLR on storm-driven hydrodynamics and barrier island morphology. A numerical model is used to simulate the hydrodynamic and morphodynamic impacts of two Gulf of Mexico hurricanes under present-day and future sea levels. SLR...
Authors
Davina Passeri, Matthew Bilskie, Nathaniel Plant, Joseph W. Long, Scott Hagen
A framework for modeling scenario-based barrier island storm impacts A framework for modeling scenario-based barrier island storm impacts
Methods for investigating the vulnerability of existing or proposed coastal features to storm impacts often rely on simplified parametric models or one-dimensional process-based modeling studies that focus on changes to a profile across a dune or barrier island. These simple studies tend to neglect the impacts to curvilinear or alongshore varying island planforms, influence of non...
Authors
Rangley Mickey, Joseph W. Long, P. Dalyander, Nathaniel Plant, David Thompson
Laboratory observations of artificial sand and oil agglomerates Laboratory observations of artificial sand and oil agglomerates
Sand and oil agglomerates (SOAs) form when weathered oil reaches the surf zone and combines with suspended sediments. The presence of large SOAs in the form of thick mats (up to 10 centimeters [cm] in height and up to 10 square meters [m2] in area) and smaller SOAs, sometimes referred to as surface residual balls (SRBs), may lead to the re-oiling of beaches previously affected by an oil...
Authors
Robert L. Jenkins, P. Dalyander, Allison Penko, Joseph W. Long
The influence of bed friction variability due to land cover on storm-driven barrier island morphodynamics The influence of bed friction variability due to land cover on storm-driven barrier island morphodynamics
Variations in bed friction due to land cover type have the potential to influence morphologic change during storm events; the importance of these variations can be studied through numerical simulation and experimentation at locations with sufficient observational data to initialize realistic scenarios, evaluate model accuracy and guide interpretations. Two-dimensional in the horizontal...
Authors
Davina Passeri, Joseph Long, Nathaniel Plant, Matthew Bilskie, Scott Hagen
Correction of elevation offsets in multiple co-located lidar datasets Correction of elevation offsets in multiple co-located lidar datasets
IntroductionTopographic elevation data collected with airborne light detection and ranging (lidar) can be used to analyze short- and long-term changes to beach and dune systems. Analysis of multiple lidar datasets at Dauphin Island, Alabama, revealed systematic, island-wide elevation differences on the order of 10s of centimeters (cm) that were not attributable to real-world change and...
Authors
David Thompson, P. Soupy Dalyander, Joseph Long, Nathaniel Plant
A methodology for modeling barrier island storm-impact scenarios A methodology for modeling barrier island storm-impact scenarios
A methodology for developing a representative set of storm scenarios based on historical wave buoy and tide gauge data for a region at the Chandeleur Islands, Louisiana, was developed by the U.S. Geological Survey. The total water level was calculated for a 10-year period and analyzed against existing topographic data to identify when storm-induced wave action would affect island...
Authors
Rangley C. Mickey, Joseph Long, Nathaniel Plant, David Thompson, P. Dalyander
Testing model parameters for wave‐induced dune erosion using observations from Hurricane Sandy Testing model parameters for wave‐induced dune erosion using observations from Hurricane Sandy
Models of dune erosion depend on a set of assumptions that dictate the predicted evolution of dunes throughout the duration of a storm. Lidar observations made before and after Hurricane Sandy at over 800 profiles with diverse dune elevations, widths, and volumes are used to quantify specific dune erosion model parameters including the dune face slope, which controls dune avalanching...
Authors
Jacquelyn Overbeck, Joseph Long, Hilary Stockdon
Non-USGS Publications**
Long, J. W., and H. T. Özkan-Haller, 2009, Low-frequency characteristics of wave group–forced vortices, J. Geophys. Res., 114, C08004, doi:10.1029/2008JC004894.
Scott, C.P., Cox, D.T., Maddux, T.B., and Long, J.W., 2005, Large-scale laboratory observations of turbulence on a fixed barred beach: Measurement Science and Technology, v. 16, p. 1903, doi: 10.1088/0957-0233/16/10/004.
Long, J. W., and H. T. Özkan-Haller, 2005, Offshore controls on nearshore rip currents, J. Geophys. Res., 110, C12007, doi:10.1029/2005JC003018.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.