Thomas R. Allen
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Thomas R. Allen has a total of 110 co-authors. Here are the top co-authors by number of shared publications:
George McLeod
2 shared publicationsJennifer L. Whytlaw
Old Dominion University, Norfolk, VA, USA
2 shared publications- Joshua G. Behr
Virginia Modeling, Analysis, and Simulation Center, Suffolk, VA 23435, USA
2 shared publications - Marina Saitgalina
School of Public Service, Old Dominion University, Norfolk, VA 23529, USA
2 shared publications - Nick Carpenter
Department of Ocean and Earth Sciences, Old Dominion University, Norfolk, USA
2 shared publications - Nicole S. Hutton
Department of Political Science and Geography, Old Dominion University, Norfolk, USA
2 shared publications
Latest Publications
- 21 October 2026
- Published by Elsevier in Ocean & Coastal Management
- Vol. 283
A spatiotemporal framework for assessing coastal squeeze pressure in coastal Virginia
- 21 October 2026
- Published by Elsevier in Ocean & Coastal Management
- Vol. 283
A spatiotemporal framework for assessing coastal squeeze pressure in coastal Virginia
- Open Access
- 13 March 2026
- Published by MDPI AG in Sustainability
- Vol. 18 (6) , 2815
Equity in Coastal Resilience: A Framework for University Engagement in Community-Based Projects
As communities face intensifying climate hazards, it is vital to strengthen resilience in ways that explicitly prioritize social equity. This study examines how higher education institutions can better support government, nonprofit, and community partners in advancing equity-centered coastal resilience in the U.S. Utilizing a qualitative research design, we analyze discussions among researchers and practitioners during a three-day workshop. We present a framework derived from a thematic analysis of breakout group transcripts from a three-day national virtual workshop involving 113 researchers and practitioners. The analysis identified four core themes: the necessity of aligning projects with community-defined priorities; the foundational role of long-term trust and relationship-building; the requirement for flexible funding to support sustained engagement; and the value of interdisciplinary, multifunctional teams. Findings indicate that while engaged and applied research can significantly advance equitable outcomes, academic researchers face systemic barriers, including rigid tenure timelines and insufficient institutional infrastructure. Consequently, we offer a three-pronged framework centered on early and continuous engagement, robust collaboration with extension services, and supportive university infrastructure. This framework provides practical guidance for institutions to transition from traditional ‘town and gown’ models toward meaningful, community-embedded, and equity-driven coastal resilience partnerships.
- 13 March 2026
- Published by MDPI AG in Sustainability
- Vol. 18 (6) , 2815
Open AccessEquity in Coastal Resilience: A Framework for University Engagement in Community-Based Projects
As communities face intensifying climate hazards, it is vital to strengthen resilience in ways that explicitly prioritize social equity. This study examines how higher education institutions can better support government, nonprofit, and community partners in advancing equity-centered coastal resilience in the U.S. Utilizing a qualitative research design, we analyze discussions among researchers and practitioners during a three-day workshop. We present a framework derived from a thematic analysis of breakout group transcripts from a three-day national virtual workshop involving 113 researchers and practitioners. The analysis identified four core themes: the necessity of aligning projects with community-defined priorities; the foundational role of long-term trust and relationship-building; the requirement for flexible funding to support sustained engagement; and the value of interdisciplinary, multifunctional teams. Findings indicate that while engaged and applied research can significantly advance equitable outcomes, academic researchers face systemic barriers, including rigid tenure timelines and insufficient institutional infrastructure. Consequently, we offer a three-pronged framework centered on early and continuous engagement, robust collaboration with extension services, and supportive university infrastructure. This framework provides practical guidance for institutions to transition from traditional ‘town and gown’ models toward meaningful, community-embedded, and equity-driven coastal resilience partnerships.
- Open Access
Evaluating the Long-Term Effectiveness of Marsh Terracing for Conservation with Integrated Geospatial and Wetland Simulation Modeling
Coastal marshes provide essential ecosystem services, yet they are vulnerable to anthropogenic stressors and climate change, particularly sea level rise (SLR). Restoration approaches like marsh terracing have emerged as nature-based strategies to enhance resilience and reduce habitat loss. This study applies the Sea Level Affecting Marshes Model (SLAMM) to assess the potential of marsh terraces to mitigate future losses, while also examining the model’s limitations, including its assumptions and capacity to reflect complex marsh processes. A geospatial approach was used to generate 3D representations of terraces through morphostatic modeling within digital elevation models (DEMs). Under a no-restoration scenario, SLAMM projections show that all marshes analyzed are at risk of total loss by 2100. In contrast, scenarios including terracing demonstrate a delay in net marsh loss, extending the persistence of key marsh habitats by approximately a decade. Although marsh degradation remains likely under high SLR conditions, the results underscore the utility of marsh terraces in prolonging habitat stability. Additionally, the study demonstrates the feasibility of integrating restoration features like terraces into DEMs and wetland models. Despite SLAMM’s simplified erosion and accretion assumptions, the model yields important insights into restoration effectiveness and long-term marsh dynamics, informing more adaptive, forward-looking coastal management strategies.
Open AccessEvaluating the Long-Term Effectiveness of Marsh Terracing for Conservation with Integrated Geospatial and Wetland Simulation Modeling
Coastal marshes provide essential ecosystem services, yet they are vulnerable to anthropogenic stressors and climate change, particularly sea level rise (SLR). Restoration approaches like marsh terracing have emerged as nature-based strategies to enhance resilience and reduce habitat loss. This study applies the Sea Level Affecting Marshes Model (SLAMM) to assess the potential of marsh terraces to mitigate future losses, while also examining the model’s limitations, including its assumptions and capacity to reflect complex marsh processes. A geospatial approach was used to generate 3D representations of terraces through morphostatic modeling within digital elevation models (DEMs). Under a no-restoration scenario, SLAMM projections show that all marshes analyzed are at risk of total loss by 2100. In contrast, scenarios including terracing demonstrate a delay in net marsh loss, extending the persistence of key marsh habitats by approximately a decade. Although marsh degradation remains likely under high SLR conditions, the results underscore the utility of marsh terraces in prolonging habitat stability. Additionally, the study demonstrates the feasibility of integrating restoration features like terraces into DEMs and wetland models. Despite SLAMM’s simplified erosion and accretion assumptions, the model yields important insights into restoration effectiveness and long-term marsh dynamics, informing more adaptive, forward-looking coastal management strategies.
- Open Access
- 12 March 2025
- Published by IntechOpen
Advancing Estuarine Shoreline Change Analysis Using Small Uncrewed Autonomous Systems
Estuarine shorelines face the threats of accelerating sea-level rise, recurrent storms, and disruptions of natural sediment and ecological adjustments owing to historic human interventions. The growing availability and technical capability of uncrewed systems (UxS), including remote or autonomous aerial and surface vessels, provide new opportunities to study and understand estuarine shoreline changes. This chapter assesses the state of the technology, interdisciplinary science and engineering literature, and presents case studies from the Chesapeake Bay, Virginia, and coastal North Carolina, USA, that demonstrate new insights into coastal geomorphic processes and applications to managing complex and dynamic estuarine shorelines. These technologies enhance the collection of geospatial environmental data, coastal monitoring, reduce spatial uncertainty, and support measurement of alongshore and onshore/offshore sediment fluxes. Case studies in this chapter highlight scientific insights such as shoreline responses to sea-level rise as well as the practical value of these technologies to develop adaptive management solutions such as living shorelines and nature-based features.
- 12 March 2025
- Published by IntechOpen
Open AccessAdvancing Estuarine Shoreline Change Analysis Using Small Uncrewed Autonomous Systems
Estuarine shorelines face the threats of accelerating sea-level rise, recurrent storms, and disruptions of natural sediment and ecological adjustments owing to historic human interventions. The growing availability and technical capability of uncrewed systems (UxS), including remote or autonomous aerial and surface vessels, provide new opportunities to study and understand estuarine shoreline changes. This chapter assesses the state of the technology, interdisciplinary science and engineering literature, and presents case studies from the Chesapeake Bay, Virginia, and coastal North Carolina, USA, that demonstrate new insights into coastal geomorphic processes and applications to managing complex and dynamic estuarine shorelines. These technologies enhance the collection of geospatial environmental data, coastal monitoring, reduce spatial uncertainty, and support measurement of alongshore and onshore/offshore sediment fluxes. Case studies in this chapter highlight scientific insights such as shoreline responses to sea-level rise as well as the practical value of these technologies to develop adaptive management solutions such as living shorelines and nature-based features.
- 14 January 2025
- Published by SAGE Publications in Public Works Management & Policy
- Vol. 30 (2) , 179-201
Considering Equity in Green Infrastructure Using an Integrative Planning Framework for Green Infrastructure Implementation
In coastal communities, green infrastructure can be part of the infrastructure investment strategy to revitalize existing infrastructure and provide protection from flooding, erosion, and other coastal hazards. This article asks the question: What are key equity considerations related to green infrastructure planning for coastal resilience? We answer this question using the voices of research experts, practitioners, and community members who participated in a virtual workshop designed to identify key questions and concerns about coastal resilience and social equity. These research and practice perspectives are synthesized using an integrative planning framework for green infrastructure implementation that was developed to answer the research question. Our findings identify equity touchpoints as they relate to four cross-cutting themes: (1) stakeholder engagement and public participation, (2) trade-offs and multiple benefits, (3) resources and capacity, and (4) data, metrics, and analysis.
- 14 January 2025
- Published by SAGE Publications in Public Works Management & Policy
- Vol. 30 (2) , 179-201
Considering Equity in Green Infrastructure Using an Integrative Planning Framework for Green Infrastructure Implementation
In coastal communities, green infrastructure can be part of the infrastructure investment strategy to revitalize existing infrastructure and provide protection from flooding, erosion, and other coastal hazards. This article asks the question: What are key equity considerations related to green infrastructure planning for coastal resilience? We answer this question using the voices of research experts, practitioners, and community members who participated in a virtual workshop designed to identify key questions and concerns about coastal resilience and social equity. These research and practice perspectives are synthesized using an integrative planning framework for green infrastructure implementation that was developed to answer the research question. Our findings identify equity touchpoints as they relate to four cross-cutting themes: (1) stakeholder engagement and public participation, (2) trade-offs and multiple benefits, (3) resources and capacity, and (4) data, metrics, and analysis.
- 1 September 2023
- Published by Project MUSE in Southeastern Geographer
- Vol. 63 (3) , 219-225
Norfolk, Virginia, and the Hampton Roads (Tidewater) Region
Located on the outer Coastal Plain physiographic province, Norfolk is situated at the confluence of the Elizabeth River and the James River, the specific feature defining the term "Hampton Roads" referring to terminuses at the riverfront. The region is underlain by thousands of feet of Quaternary sediments derived from the Appalachian Mountains (Parham et al. 2013). The region lies east of the Fall Line and within the Chesapeake Bay watershed and the ancient Susquehanna River (Grymes 2020). However, several coastal [End Page 219]
- 1 September 2023
- Published by Project MUSE in Southeastern Geographer
- Vol. 63 (3) , 219-225
Norfolk, Virginia, and the Hampton Roads (Tidewater) Region
Located on the outer Coastal Plain physiographic province, Norfolk is situated at the confluence of the Elizabeth River and the James River, the specific feature defining the term "Hampton Roads" referring to terminuses at the riverfront. The region is underlain by thousands of feet of Quaternary sediments derived from the Appalachian Mountains (Parham et al. 2013). The region lies east of the Fall Line and within the Chesapeake Bay watershed and the ancient Susquehanna River (Grymes 2020). However, several coastal [End Page 219]
- 1 March 2023
- Published by Project MUSE in Southeastern Geographer
- Vol. 63 (1) , 54-77
Coastal Science for Resilience and Management at the Cape Hatteras National Seashore, NC, USA
National seashores are cherished public lands with rich environmental, cultural, and historic resources. The Cape Hatteras National Seashore is one such coastal asset that is both bountiful yet vulnerable, with historic lighthouses, critical habitats, and recreational amenities alike facing threats of sea-level rise and continual storm and climate change impacts. Over 3 million visitors to the Seashore in 2021 set an annual visitation record. Historic resources such as the Bodie Island Lighthouse and Ocracoke Lighthouse are among the most visited sites, yet these assets are also among those most vulnerable to flooding, compromised structural integrity, and reduced accessibility. Future challenges to the protection and management of such resources are already being felt in the form of storms, extreme rainfall, and recurrent compound flooding. Such threats are also coincident with increasing visitation and recreational demand. This paper examines the science-based data that are being collected and management efforts underway to inform future planning, intervention, or adaptation to sea-level rise and barrier island evolution. The paper identifies the opportunities for mitigation and adaptation as well as potential environmental tipping points and limits to resilience by assessing the frequency and magnitude of flooding events and shoreline change.
- 1 March 2023
- Published by Project MUSE in Southeastern Geographer
- Vol. 63 (1) , 54-77
Coastal Science for Resilience and Management at the Cape Hatteras National Seashore, NC, USA
National seashores are cherished public lands with rich environmental, cultural, and historic resources. The Cape Hatteras National Seashore is one such coastal asset that is both bountiful yet vulnerable, with historic lighthouses, critical habitats, and recreational amenities alike facing threats of sea-level rise and continual storm and climate change impacts. Over 3 million visitors to the Seashore in 2021 set an annual visitation record. Historic resources such as the Bodie Island Lighthouse and Ocracoke Lighthouse are among the most visited sites, yet these assets are also among those most vulnerable to flooding, compromised structural integrity, and reduced accessibility. Future challenges to the protection and management of such resources are already being felt in the form of storms, extreme rainfall, and recurrent compound flooding. Such threats are also coincident with increasing visitation and recreational demand. This paper examines the science-based data that are being collected and management efforts underway to inform future planning, intervention, or adaptation to sea-level rise and barrier island evolution. The paper identifies the opportunities for mitigation and adaptation as well as potential environmental tipping points and limits to resilience by assessing the frequency and magnitude of flooding events and shoreline change.
- Open Access
- 29 October 2021
- Published by MDPI AG in Journal of Marine Science and Engineering
- Vol. 9 (11) , 1196
Anticipating and Adapting to the Future Impacts of Climate Change on the Health, Security and Welfare of Low Elevation Coastal Zone (LECZ) Communities in Southeastern USA
Low elevation coastal zones (LECZ) are extensive throughout the southeastern United States. LECZ communities are threatened by inundation from sea level rise, storm surge, wetland degradation, land subsidence, and hydrological flooding. Communication among scientists, stakeholders, policy makers and minority and poor residents must improve. We must predict processes spanning the ecological, physical, social, and health sciences. Communities need to address linkages of (1) human and socioeconomic vulnerabilities; (2) public health and safety; (3) economic concerns; (4) land loss; (5) wetland threats; and (6) coastal inundation. Essential capabilities must include a network to assemble and distribute data and model code to assess risk and its causes, support adaptive management, and improve the resiliency of communities. Better communication of information and understanding among residents and officials is essential. Here we review recent background literature on these matters and offer recommendations for integrating natural and social sciences. We advocate for a cyber-network of scientists, modelers, engineers, educators, and stakeholders from academia, federal state and local agencies, non-governmental organizations, residents, and the private sector. Our vision is to enhance future resilience of LECZ communities by offering approaches to mitigate hazards to human health, safety and welfare and reduce impacts to coastal residents and industries.
- 29 October 2021
- Published by MDPI AG in Journal of Marine Science and Engineering
- Vol. 9 (11) , 1196
Open AccessAnticipating and Adapting to the Future Impacts of Climate Change on the Health, Security and Welfare of Low Elevation Coastal Zone (LECZ) Communities in Southeastern USA
Low elevation coastal zones (LECZ) are extensive throughout the southeastern United States. LECZ communities are threatened by inundation from sea level rise, storm surge, wetland degradation, land subsidence, and hydrological flooding. Communication among scientists, stakeholders, policy makers and minority and poor residents must improve. We must predict processes spanning the ecological, physical, social, and health sciences. Communities need to address linkages of (1) human and socioeconomic vulnerabilities; (2) public health and safety; (3) economic concerns; (4) land loss; (5) wetland threats; and (6) coastal inundation. Essential capabilities must include a network to assemble and distribute data and model code to assess risk and its causes, support adaptive management, and improve the resiliency of communities. Better communication of information and understanding among residents and officials is essential. Here we review recent background literature on these matters and offer recommendations for integrating natural and social sciences. We advocate for a cyber-network of scientists, modelers, engineers, educators, and stakeholders from academia, federal state and local agencies, non-governmental organizations, residents, and the private sector. Our vision is to enhance future resilience of LECZ communities by offering approaches to mitigate hazards to human health, safety and welfare and reduce impacts to coastal residents and industries.
- Open Access
- 7 May 2021
- Published by MDPI AG in ISPRS International Journal of Geo-Information
- Vol. 10 (5) , 310
Exploring Spatial Patterns of Virginia Tornadoes Using Kernel Density and Space-Time Cube Analysis (1960–2019)
This study evaluates the spatial-temporal patterns in Virginia tornadoes using the National Weather Service Storm Prediction Center’s Severe Weather GIS (SVRGIS) database. In addition to descriptive statistics, the analysis employs Kernel Density Estimation for spatial pattern analysis and space-time cubes to visualize the spatiotemporal frequency of tornadoes and potential trends. Most of the 726 tornadoes between 1960–2019 occurred in Eastern Virginia, along the Piedmont and Coastal Plain. Consistent with other literature, both the number of tornadoes and the tornado days have increased in Virginia. While 80% of the tornadoes occurred during the warm season, tornadoes did occur during each month including two deadly tornadoes in January and February. Over the 60-year period, a total of 28 people were killed in the Commonwealth. Most tornado activity took place in the afternoon and early evening hours drawing attention to the temporal variability of risk and vulnerability. Spatial analysis results identify significant, non-random clusters of tornado activity and increasing temporal frequency. While this study improves weather-related literacy and addresses a need in the Commonwealth, more research is necessary to further evaluate the synoptic and mesoscale mechanisms of Virginia tornadoes.
- 7 May 2021
- Published by MDPI AG in ISPRS International Journal of Geo-Information
- Vol. 10 (5) , 310
Open AccessExploring Spatial Patterns of Virginia Tornadoes Using Kernel Density and Space-Time Cube Analysis (1960–2019)
This study evaluates the spatial-temporal patterns in Virginia tornadoes using the National Weather Service Storm Prediction Center’s Severe Weather GIS (SVRGIS) database. In addition to descriptive statistics, the analysis employs Kernel Density Estimation for spatial pattern analysis and space-time cubes to visualize the spatiotemporal frequency of tornadoes and potential trends. Most of the 726 tornadoes between 1960–2019 occurred in Eastern Virginia, along the Piedmont and Coastal Plain. Consistent with other literature, both the number of tornadoes and the tornado days have increased in Virginia. While 80% of the tornadoes occurred during the warm season, tornadoes did occur during each month including two deadly tornadoes in January and February. Over the 60-year period, a total of 28 people were killed in the Commonwealth. Most tornado activity took place in the afternoon and early evening hours drawing attention to the temporal variability of risk and vulnerability. Spatial analysis results identify significant, non-random clusters of tornado activity and increasing temporal frequency. While this study improves weather-related literacy and addresses a need in the Commonwealth, more research is necessary to further evaluate the synoptic and mesoscale mechanisms of Virginia tornadoes.
- 23 March 2021
- Published by Taylor & Francis in Maritime Policy & Management
- Vol. 49 (4) , 577-599
Sea level rise exposure assessment of U.S. East Coast cargo container terminals
Continuity of marine port operations and recovery in the event of disaster and flooding are dependent upon planning for acute or chronic disruptions. Ports are developing the capacity to integrate climate change adaptation with strategic planning and making capital investments in infrastructure. Geospatial risk assessments have demonstrated utility for planning marine port terminal facilities. Such assessments have tended to be coarse and comprehensive (whole port cities) or narrow, site-specific and single-hazard approaches (single terminal or site scale). This study develops a methodology for major container port terminals on the Eastern Seaboard of the United States to advance a screening approach to sea level rise, identify exposure to terminals and associated surface transportation, and enable comparative assessment. The study leverages geospatial data, elevation, imagery, transportation databases, tide gauges, and sea level rise projections. The approach extends prior methods to quantify exposure across multiple ports and terminals. Hypsographs and modelled future tidal flooding are derived for each port. Results highlight the need for port planning to develop GIS, monitor sea level rise trends, engage in integrative assessments, and optimize mitigation and adaptation actions. Results show similarities across yet also differentially increasing threats of relative sea level rise and tidal flooding at individual terminals.
- 23 March 2021
- Published by Taylor & Francis in Maritime Policy & Management
- Vol. 49 (4) , 577-599
Sea level rise exposure assessment of U.S. East Coast cargo container terminals
Continuity of marine port operations and recovery in the event of disaster and flooding are dependent upon planning for acute or chronic disruptions. Ports are developing the capacity to integrate climate change adaptation with strategic planning and making capital investments in infrastructure. Geospatial risk assessments have demonstrated utility for planning marine port terminal facilities. Such assessments have tended to be coarse and comprehensive (whole port cities) or narrow, site-specific and single-hazard approaches (single terminal or site scale). This study develops a methodology for major container port terminals on the Eastern Seaboard of the United States to advance a screening approach to sea level rise, identify exposure to terminals and associated surface transportation, and enable comparative assessment. The study leverages geospatial data, elevation, imagery, transportation databases, tide gauges, and sea level rise projections. The approach extends prior methods to quantify exposure across multiple ports and terminals. Hypsographs and modelled future tidal flooding are derived for each port. Results highlight the need for port planning to develop GIS, monitor sea level rise trends, engage in integrative assessments, and optimize mitigation and adaptation actions. Results show similarities across yet also differentially increasing threats of relative sea level rise and tidal flooding at individual terminals.