20 Mar 2024

Balancing Climate Resilience and Adaptation for Caribbean Small Island Developing States (SIDS): Building Institutional Capacity

Abstract: Although the Caribbean's Small Island Developing States (SIDS) minimally contribute to global greenhouse gas emissions, they face disproportionate climate risks and are particularly susceptible to systemic economic threats posed by climate change and subsequent increases in climate variability. Historically, strategic programs and investments have sought to develop more robust and adaptive engineered systems to absorb climate threats. However, such initiatives are limited and under-resourced in the SIDS’ context. This article reviews existing climate strategies in the Caribbean and then critically examines current gaps and barriers relating to climate impact knowledge, needs, and implementation. This examination can assist Caribbean SIDS leadership to identify opportunities to transition from a vulnerability-reducing mindset to one of resilience and transformative adaptation to improve long-term economic outlooks, social welfare, and environmental stewardship despite recurring and escalating climate risks.

20 Mar 2024

Hazardous and Solid Waste Management Planning in Select African Countries

Abstract: Managing wastes produced during contingency operations in United States Africa Command (USAFRICOM) locations has historically relied on local contract disposal or open-air burn pits, which have been shown to be harmful to the health of service members. Posture locations that can find alternative ways to manage waste, specifically through contracts with the host country’s waste services, can better protect the health and safety of the warfighter and the native landscapes. African waste systems are complex, decentralized systems with considerable regional variation. The lack of government-funded waste management services leaves many residents with few options for safe disposal. The differing waste disposal strategies are described to offer guidance for military operations in the focus countries of Gabon, Ghana, Kenya, Morocco, Niger, Senegal, and Uganda. Relevant international agreements regulating the flow of hazardous waste across borders that can impact disposal plans are also noted. This report serves as a reference to develop waste management alternatives in the USAFRICOM area of responsibility (AOR). Official Department of Defense and Army regulations should be consulted when devising an integrated waste management plan.

18 Mar 2024

User Guidelines on Catchment Hydrological Modeling with Soil Thermal Dynamics in Gridded Surface Subsurface Hydrologic Analysis (GSSHA)

Abstract: Climate warming is expected to degrade permafrost in many regions of the world. Degradation of permafrost has the potential to affect soil thermal, hydrological, and vegetation regimes. Projections of long-term effects of climate warming on high latitude ecosystems require a coupled representation of soil thermal state and hydrological dynamics. Such a coupled framework was developed to explicitly simulate the soil moisture effects of soil thermal conductivity and heat capacity and its effects on hydrological response. In the coupled framework, the Geophysical Institute Permafrost Laboratory (GIPL) model is coupled with the Gridded Surface Subsurface Hydrologic Analysis (GSSHA) model. The new permafrost heat transfer in GSSHA is computed with the GIPL scheme that simulates soil temperature dynamics and the depth of seasonal freezing and thawing by numerically solving a one-dimensional quasilinear heat equation with phase change. All the GIPL input and output parameters and the state variables are set up to be consistent with the GSSHA input-output format and grid distribution data input requirements. Test-case simulated results showed that freezing temperatures reduced soil storage capacity, thereby producing higher peak and lower base flow. The report details the functions and format of required input variables and cards, as a guideline, in GSSHA hydrothermal analysis of frozen soils in permafrost active areas.

18 Mar 2024

Building Elevation in Mangrove Communities: Use of Regional Sediment Management to Increase Coastal Wetland Resilience to Sea-Level Rise

Abstract: This Regional Sediment Management technical report outlines initial steps to implement a proof-of-concept physical model to develop demonstration scale evidence that supports managed wetland transgression through sediment augmentation via a thin-layer placement strategy. The proof-of-concept physical model will evaluate the ability of thin-layer placement to increase elevation and enhance recruitment within coastal scrub mangrove wetlands most vulnerable to sea-level rise. The investigation sought to identify feasible project locations, sediment sources that included beneficial use of dredged material opportunities, and environmentally acceptable construction techniques. Results of this initial step will be used to secure funding to permit, construct, implement, and monitor the proof-of-concept physical model. The results of this initiative will inform and direct management measure development for the ongoing Biscayne Bay Southeastern Everglades Restoration Project, the only coastal component of the Comprehensive Everglades Restoration Plan and the only component with an obligation to increase habitat resilience. Results are applicable to areas throughout the Gulf, Atlantic, and Pacific Coasts of the United States where direct preservation, enhancement, and restoration of mangrove and other coastal wetland communities will build coastal resiliency, reduce storm hazards damage, and create habitat for a variety of fish and wildlife species, particularly as sea levels rise.

11 Mar 2024

The Madness behind the Method: Showing the Human Side of Developing a World-Class Institution

Abstract: The 2022–2023 Leadership Development Program 2 (LDP2) team from the Information Technology Laboratory (ITL) created this document to explore the human side of ITL’s history through the viewpoints of former influential figures at the lab. These individuals played a crucial role in elevating the lab to its current prominent position. The dynamic nature of the document allows continuous addition of such stories, providing future generations with insight into the unwavering commitment of the pioneers who established ITL’s esteemed legacy. Each nar-rative sheds light on different aspects of the lab, including its people, diversity, and excellence. The document serves as both a tribute to the lab’s achievements and a wellspring of inspiration for aspiring leaders, showcasing the profound impact of dedication and teamwork. By cele-brating these stories, we are able to learn from those who came before us and cultivate an enhanced vision for the future.

5 Mar 2024

Environmental DNA Sampling for At-Risk and Invasive Species Management on Military Ranges: Guidelines and Protocols for Installation Biologists and Land Managers

Abstract: Environmental DNA (eDNA) analysis, or the detection of trace DNA shed by organisms into their environment, has the potential to transform Army capabilities for threatened and endangered species (TES) and invasive species management by providing a rapid, noninvasive, and cost-effective option for monitoring wildlife. Despite these benefits, eDNA analysis is underutilized on military installations as limited access to guidance materials, protocols, training opportunities, and support from eDNA scientists makes it difficult for installation biologists and military land managers to design and execute eDNA surveys, let alone identify management questions that may benefit from eDNA monitoring. Therefore, the aim of this resource is to increase awareness of the benefits and limitations of eDNA monitoring and provide eDNA study design guidelines and field sampling protocols for nonexperts to make this tool more accessible to installation biologists and land managers and help facilitate the adoption of eDNA-based approaches for wildlife management on military ranges.

1 Mar 2024

Application of Limited-Field-Data Methods in Reservoir Volume Estimation: A Case Study

Abstract: The conventional approach to estimating lake or reservoir water volumes hinges on field data collection; however, volume estimation methods are available that use little or no field data. Two such methods—the simplified V-A-h (volume-area-height) and the power function—were applied to a set of six anthropogenic reservoirs on the Fort Jackson, South Carolina, installation and checked against a validation data set. Additionally, seven interpolation methods were compared for differences in total volume estimation based on sonar data collected at each reservoir. The simplified V-A-h method overestimated reservoir volume more than each technique in the power function method, and the categorical technique underestimated the most reservoir volumes of all three techniques. Each method demonstrates high Vₑᵣᵣ variability among reservoirs, and Vₑᵣᵣ for the Power Function techniques applied here is consistent with that found in previous research in that it is near or less than 30%. Compared with Vₑᵣᵣ in other studies evaluating the simplified V-A-h method, Vₑᵣᵣ in this study was found to be 10%–20% higher.

29 Feb 2024

Computationally Efficient Modeling of Lightweight Expeditionary Airfield Surfacing Systems at Large Length Scales

Abstract: Expeditionary airfield matting systems are lightweight, portable surfaces that enable the rapid deployment of infrastructure to support aircraft operations. Individual matting components are assembled via interlocking joints to construct arrays that serve as temporary aircraft operating surfaces. The paper outlines the homogenization of the AM2 portable airfield matting system and its interlocking mechanisms to permit computationally efficient analyses toward understanding mechanisms that influence the global behavior of these arrays and underlying subgrade during aircraft maneuvers. An equivalent orthotropic two-dimensional continuum was developed from finite element analysis of a detailed three-dimensional model and its flexural behavior was validated against experimental data and solid finite element models. Interlocking joints were characterized using node-to-node connector elements based on subscale finite element studies. Both components were implemented into a full-scale model representative of a typical test section, and responses to static high tire pressure aircraft loads were analyzed over a soil foundation representing a California bearing ratio of 6%, yielding promising agreement with experimental data. Results of this study reveal an inherent coupling between load transfer, mat deflection, and near-surface subgrade stress with dependence on tire location, mat core shear flexibility, and joint stiffness.

29 Feb 2024

Analysis of Vegetation as Terrain: The “How” and “Why” of US Army Doctrine

Abstract: There is a significant knowledge gap for Army doctrine concerning civilian research scientists. A relatively small number of soldiers make the transition from warfighter to research and development at the basic and applied levels. That number is even less when considering former warfighters that have applied Army doctrine in an operational or advanced Army schooling environment. This special report is intended to focus solely on the Army’s current capabilities and doctrinally defined processes to analyze vegetation as an essential component of the natural terrain. The objective of this report is to review current Army doctrine related to analysis of the vegetated terrain; to explore currently leveraged tactics, techniques, and procedures (TTPs); and identify valuable geospatial resources as they apply to military planning. For ease to readers unfamiliar with US Army doctrine, much of the referenced material is directly presented herein as tables and figures throughout the document and appendices (e.g., data sources, product examples, and glossary).

29 Feb 2024

Waterway Engineering Applications of Automatic Identification System Data along the Mississippi River and at Lock Structures

Abstract: The USACE, St. Louis District, is responsible for maintaining navigation channels along with multiple lock and dam structures on the Mississippi River, a vital inland waterway that carries millions of tons of commodities every year. Understanding commercial vessel traffic patterns is fundamental to informing decisions about construction projects and to efforts to improve communication to mariners. Automatic Identification System (AIS) data provides time-stamped and geo-referenced vessel position reports for most commercial vessels operating in the District’s area of interest. This paper describes how AIS data has been successfully used by St. Louis District waterway managers to (1) prevent conflicts with the navigation industry by revealing active fleeting areas that were under consideration for the construction of river training structures; and (2) identify changes in vessel approaches to a lock structure under different river flow conditions, providing operational information that could be used in future navigation alerts to mariners. This paper concludes with a list of suggested best practices for waterways managers who want to start, or expand, their use of AIS data.