Digital Commons Network^™

Statewide Sinkhole Susceptibility Mapping In Florida Using Explainable Geoai, Osama M. Altarawneh, Weiwei Zhan, Clint Kromhout

Sinkhole Conference 2026

Sinkholes cause persistent damage to infrastructure, property, and groundwater resources across Florida. Statewide sinkhole hazard mitigation has been constrained by incomplete inventories and the absence of a high-resolution susceptibility map. This study presents a statewide sinkhole susceptibility assessment using an explainable GeoAI framework that integrates the citizen-reported Subsidence Incident Reports (SIR) database and a geologist-confirmed collapse-type sinkhole inventory from the Florida Geological Survey (FGS). Random Forest (RF) is used as the primary learner with ten geologic, hydrologic, topographic, and anthropogenic predictors. The influence of negative-sample buffer geometry on model behavior is evaluated across five annular buffer conditions (100-1000 m through …

Mobile Lidar Scans Of Caves: Methods For Tying In Ground Control Points, Robert E. Salaz, Jake Slyder, Ellen Trautner, Georgia Schneider

Sinkhole Conference 2026

Mapping cave passages using modern techniques such as Light Detection and Ranging (LiDAR) and photogrammetry are still in the juvenile stages. Newer technologies such as Simultaneous Location and Mapping (SLAM) LiDAR and faster computers have enabled speleologists to map caves much faster than traditional methods. From a land management perspective, the ability to efficiently collect detailed cave maps with reasonable precision quickly is crucial for decision making. The ongoing challenge with digital cave mapping using mobile LiDAR and photogrammetry techniques is geolocating the point-cloud underground. Mobile scanning methods can be tied to ground control points on the surface using high …

Mapping Sinkholes And Closed Depressions In The Edwards Aquifer Recharge Zone: Comparison Of Lidar-Based Semi-Automated Detection Methods And Field Validation, Enzo Franceschi Genesi, Horia G. Olariu, Bradford Wilcox

Sinkhole Conference 2026

Sinkholes and closed depressions play a critical role in karst hydrology by facilitating rapid recharge to aquifer systems (Ford & Williams, 2007; White, 1988), yet their spatial distribution is often poorly quantified in large recharge zones, and the automated methods used to detect them vary widely in approach and reliability. This study compares three LiDAR-based automated detection methods to determine their relative performance for mapping sinkholes and closed depressions within the Edwards Aquifer Recharge Zone, using a 0.5-meter resolution bare-earth Digital Elevation Model derived from high-density airborne LiDAR point cloud data (12.66 points/m²) obtained from OpenTopography. The three methods evaluated …

Karst Sinkholes And Civil Engineering: Overview Of Characterization And Treatment Options From A Geophysical And Geotechnical Viewpoint, Mia Painter, Stephen Welsh

Sinkhole Conference 2026

Sinkholes pose a significant geohazard to civil engineering infrastructure in regions underlain by carbonate karst terrain. Selecting an appropriate stabilization method requires balancing site conditions, infrastructure risk, environmental considerations, and cost, all of which depend on a thorough understanding of the planned or existing infrastructure and subsurface conditions. This paper provides an overview of common sinkhole characterization and stabilization methods used in the Mid-Atlantic and Appalachian regions of the United States from both geotechnical and geophysical perspectives. The application of geophysical methods in conjunction with intrusive investigations is reviewed as a means of reducing subsurface uncertainty and refining treatment designs. …

Sinkhole Hazards, Risks, And Remediation: A Fifty-Year Case Study In New Jersey, Usa, Oladoyin Kolawole, Rita L. Sousa, Christina Comuso, Mohab Hussein

Sinkhole Conference 2026

New Jersey presents a uniquely complex sinkhole and ground subsidence hazard shaped by intersecting geological, industrial, and anthropogenic forces. Sinkhole herein refers primarily to collapse sinkholes, that is, the abrupt or progressive downward failure of the ground surface into subsurface voids, as distinct from solutional closed depressions of purely karst origin. This paper synthesizes five decades (1976-2026) of documented sinkhole and ground subsidence records across the state, examining root causes, societal and environmental impacts, and remediation strategies employed in response to such hazards. The review shows that New Jersey’s hazard is governed by three dominant mechanisms: karst dissolution in carbonate …

Creating A Karst Features Map Of A 7.5-Minute Quadrangle In Northern New Jersey, Zachary Schagrin

Sinkhole Conference 2026

Extensive areas of northern New Jersey are underlain by carbonate rocks, ranging from Proterozoic marbles to Paleozoic limestones and dolomites. These areas include large portions of Sussex and Warren Counties, as well as smaller areas within Hunterdon, Morris, Passaic, and Somerset Counties. As part of its efforts to map the geology of the state, the New Jersey Geological and Water Survey (NJGWS) has undertaken efforts to create karst features maps of quadrangles within this area—known as the Karst Susceptibility Project Area. Through field mapping, GIS analysis, and interpretation of past data collection, NJGWS began publishing these 1:24,000-scale maps in 2023. …

Remediating Groundwater In A Karst Terrane: Encouraging Results And Lessons Learned, Urvi Tulsiani, Jason M. Tillotson, Allison Nelan, Keith A. White

Sinkhole Conference 2026

Karst aquifers, characterized by a combination of multiple porosity types, discrete flow paths, and variable hydraulic conductivities, create a highly complex and heterogeneous environment that influences both the storage capacity and transport of contaminants in the subsurface. These complexities of karst aquifers present unique challenges for remediating contaminated groundwater. Pilot studies were performed at eight sites at Redstone Arsenal (RSA) in Huntsville, Alabama, to assess the viability of in situ injection-based remedies to treat groundwater impacted by chlorinated volatile organic compounds (CVOCs) and perchlorate in the epikarst, the uppermost, highly weathered rind of karst bedrock. The studies assessed effectiveness of …

Ongoing Dye Tracing Prompts Major Reevaluation Of Groundwater Divides For The Lost River Karst System, Bowling Green, Ky, Usa, Lee Anne Bledsoe, Chris G. Groves, Nick Lawhon

Sinkhole Conference 2026

The Lost River Groundwater Basin located in south-central Kentucky may be one of the most thoroughly investigated karst basins in the US. Over the past 50 years, numerous studies have been conducted primarily due to the environmental challenges created by urban development on a well-developed sinkhole plain. The City of Bowling Green (pop. ~80,000) covers much of the basin but lies primarily in the northern, downstream reach nearest the main outlet of the system, the Lost River Rise. However, land use in the southern, up-gradient, portion of the basin is quickly changing from undeveloped and/or agriculture to industrial and residential. …

Characterization Of The Galena Karst Of East-Central Olmsted County, Minnesota, John D. Barry, Ronald C. Spong, Peter J. Hutchinson, Martin Larsen, Anthony C. Runkel

Sinkhole Conference 2026

The Galena Group is mostly composed of carbonate rock with subordinate beds of fine siliciclastics, mainly shale. In southeastern Minnesota, it is a source of water for domestic and agricultural use. Hydrologic and geochemical characterization of a Galena Group spring, Bear Spring, began in 1979. Recent springshed delineation through dye tracing and continuous level, temperature, and nitrate monitoring has shed light on the aquifer’s hydrologic response to precipitation, but the degree of karstification in the Galena was unclear. Current and planned future modeling require additional insight into the pervasiveness of fractures and conduits, and their properties. A suite of characterization …

Investigating Sediment Accumulation Dynamics Via Integration Of Gis And Remote Sensing Tools Along With Physical/Chemical Characteristics Of Sediments In Owl Cave, Highland County, Virginia, Dhanuska B. Wijesinghe, Spencer Schmidt

Sinkhole Conference 2026

The Valley region of Virginia, USA, features cave and karst systems. Variation in surface topography and vegetation within these systems significantly affects sediment accumulation in cave ecosystems. Remote sensing and GIS tools effectively analyze surface conditions, including vegetation cover and its influence on sediment buildup in caves. This study involved collecting high-resolution drone imagery, such as LiDAR, multispectral, and thermal data near Owl Cave in Highland County, VA, to understand the sediment accumulation process inside the cave system. High-resolution digital elevation models (DEMs) were created from LiDAR point clouds, and vegetation indices like Normalized Difference Vegetation Index (NDVI) were calculated …

A Comprehensive Look At Ohio’S Karst Inventory Mapping—Reconnaissance, Ground-Truth, And Beyond, Brittany Parrick, Douglas Aden

Sinkhole Conference 2026

Keywords: Ohio, mapping, karst inventory, karst database, fieldwork, LiDAR, karst, GIS, geomorphology, digital elevation models The present iteration of the karst inventory mapping program at the Ohio Department of Natural Resources, Division of Geological Survey (herein the Survey) has been ongoing since 2009. With documentation of the Survey’s previous karst inventory mapping scattered across several decades-old publications—coupled with the karst community’s demonstrated need for a standardized database—this paper outlines the program’s evolution from its inception to the present. New Digital Elevation Models (DEM) derived from modern Light Detection and Ranging (LiDAR) datasets, along with modern mobile applications, have significantly improved …

Cover Collapse Sinkholes In Stormwater Infrastructure In The Urban Karst Of Bowling Green, Kentucky: Occurrence, Mitigation, And Prevention, Nick Lawhon P.G., C.F.M.

Sinkhole Conference 2026

Cover collapse sinkholes are an extremely common geohazard in karst terrains. These features, formed by concentrated flows of water entering the subsurface through discrete points in the epikarst, are particularly common in stormwater infrastructure in Bowling Green, KY. There are currently 787 known stormwater basins and hundreds of miles of stormwater conveyances in this fast-developing city, all of which concentrate stormwater flows over the naturally sinkhole-prone karst system. This paper reports on the occurrence of cover collapse sinkholes in stormwater infrastructure, particularly retention and detention basins, from inspections over the past 7 years and records from City-managed sinkhole repair projects, …

A Comprehensive Analysis Of Stratigraphic Influence On Karst Feature Distribution And Density Across Southeast Minnesota, Usa, Julia R. Steenberg, John D. Barry, Andrew J. Retzler, Anthony C. Runkel, Robert G. Tipping, E. Calvin Alexander Jr.

Sinkhole Conference 2026

Karst features pose significant risks to infrastructure and land use, from reducing tillable acreage to causing catastrophic failures in wastewater lagoons. This study analyzes the stratigraphic and spatial distribution of karst features in southeastern Minnesota to better understand their geologic controls. By seamlessly merging raster surfaces of Paleozoic bedrock units and intersecting them with regional karst datasets in a GIS framework, we found that over 95 percent of mapped sinkholes occur where unconsolidated sediment overlying bedrock is 15 meters or less. Furthermore, 81 percent of sinkholes are concentrated in just six of the 21 mappable bedrock units, each of which …

Hasparos Embayment – An Example Of Intrastratal Hypogenic Speleogenesis, Peter Hutchinson

Sinkhole Conference 2026

The Hasparos Embayment contains Neogene-aged deposits that overlie the Permian-aged San Andres Formation. The Hasparos Embayment consists of thousands of subsidence sinkholes, concentrated in two tracts that are overlain with deposits provisionally considered to be part of the Ogallala Formation. The two Ogallala-covered karst fields are divided north and south by the Hasparos Canyon. The northern karst field includes 12,400 hectares, whereas the southern tract includes 6,900 hectares. Intrastratal karst is a form of hypogene speleogenesis, in which karst develops in rocks buried by younger deposits after deposition of the younger rocks. Thus during the temperate, late Pleistocene epoch, Lake …

Constraining The Groundwater Pathways Driving Cave Formation In The Water Sinks Area In Highland County, Virginia, Usa Using Electrical Resistivity Imaging, Shamsuddin Ahmed, R Shane Mcgary

Sinkhole Conference 2026

Speleogenesis in carbonate bedrock occurs when water, acidified by CO2 , dissolves calcium carbonate (CaCO3) in rocks to form voids and dissolutional conduits. The near surface geology of the Water Sinks area is dominated by Silurian–Devonian limestones, accommodating numerous karst features including sinkholes, caves, and springs. Groundwater flow and cave development in the area is thought to be guided primarily by geologic structure (folds, bedding, and joints) and low-permeability layers. In this study, we use electrical resistivity methods to detect and characterize conduits and water flow paths in the subsurface. We collect dipole-dipole and Schlumberger array data along seven transects …

Brine-Enhanced Hypogenic Speleogenesis And Concentrated Karst Development In The Burton Flats, Eddy County, New Mexico, Dave Decker, Garrett Jorgensen Olague, Michael Jones, Ryan Palmer

Sinkhole Conference 2026

The Burton Flats, a 259-km² gypsum-dominated outcrop of the Permian Rustler Formation 26 km northeast of Carlsbad, New Mexico, contains more than 3,500 documented karst features — an anomalously high density relative to surrounding areas of equivalent lithology. The proposed explanation is a two-step brine-enhanced dissolution mechanism driven by the spatial intersection of three factors: the eastward-dipping Rustler Formation outcrop, the underlying Capitan Aquifer, and the intervening Permian Salado Formation. Fresh Capitan water dissolves Salado halite, generating an NaCl-enriched brine up to three times more aggressive toward gypsum dissolution than fresh water; this brine ascends into the Rustler Formation along …

Documenting The Ineffable: A Comparative Analysis Of Mystical Representation In Kimiavi’S The Garden Of Stones And Western Sufi Documentary, Hessam Abedini

Journal of Religion & Film

This article examines how documentary film attempts to represent mystical experience through comparative analysis of Parviz Kimiavi's The Garden of Stones (1976) and American documentaries featuring Samuel Lewis, particularly Sunseed (1973). Rather than assuming terms like "sacred" or "authentic," the study grounds its analysis in empirical definitions from William James, historical scholarship by Carl Ernst and Annemarie Schimmel, and literary theory from Fatemeh Keshavarz. Through detailed examination of specific scenes—Darvish Khan hanging stones from dead trees, Lewis leading ecstatic dances—the article demonstrates how different cinematic strategies approach documentary's epistemological limits when confronting ineffable experience.

The analysis corrects historical misunderstandings about …

The Lived Experiences Of Philanthrocapitalism: Recentering Borrowers’ Experiences In Microloan Discourse, Holli Schlukebir

PNHA Review

With 1.7 billion adults worldwide alienated from traditional financial structures(Drake, 2018), increasing their access as a method of building financial mobility is increasingly dominating discourse around international development; within this philanthrocapitalist conversation is the ever-popular model of microloans. By examining recently published articles documenting women receiving microloans, this prevailing assumption of philanthrocapitalism compared to the borrowers’ testimonies collected in the case studies listed above. In examining whether microloans increase some alienated women’s income-generating activities in developing areas, the conversation is redirected to borrowers lived experiences and the contextual factors that influence economic mobility. The following analysis attempts to answer the …

Volunteer Managers’ Leadership Competency Impact On Court Ordered Volunteer Service Programs, Bex Takacs-Britz

PNHA Review

This paper explores how nonprofit leaders can build more effective and more equitable court-ordered community service programs that support both organizational missions and the long-term success of justice-involved individuals. Drawing from literature in nonprofit management, volunteer administration, ethics, leadership, and criminal justice, this paper examines the barriers that often limit meaningful opportunities for court-ordered volunteers and the leadership competencies necessary to create stronger programs. To better understand current practices, I conducted semi-structured interviews with volunteer managers from Michigan nonprofit organizations about their experiences managing court-ordered volunteers, navigating organizational culture, and balancing inclusion with risk management concerns. Across interviews, several themes …

Navigating Renewable Energy Utilizing Public Administration, Abigail De Meo

PNHA Review

In the modern era of public administration, the rise of renewable energy presents new policy challenges and opportunities that impact not only global systems but also the physical and political environments of local governments. This paper examines the interconnected relationship between renewable energy and public administration, offering tools derived from academic literature to support effective policy navigation. The analysis focuses on Michigan’s Public Act 233 of 2023 and Public Act 235 of 2023 to illustrate the real-time implications for local administrators. Technical, ethical, and leadership competencies are explored through both literature and interviews to identify critical skills necessary for navigating …

Economic Development And The Revitalization Of Small Town America: A Comparative Analysis Of Four Michigan Communities, Christopher J. Marco

PNHA Review

This research article presents a comparative analysis of economic development efforts in four West Michigan communities: Grand Haven, Holland, Hudsonville, and Zeeland. These cities have developed economic development plans specifically targeting the revitalization of their downtowns and commercial districts. This paper discusses the history of each community, assesses their current economic development efforts, and frames them within a greater discussion of scholarship on economic development strategies in small and rural U.S. communities. It seeks to answer five core research questions and conducts a comparative analysis of the four towns employed as case studies for the paper. This comparative analysis assesses …

From The Editor-In Chief, Richard W. Jelier

PNHA Review

No abstract provided.

Front Matter, Pnha Review

PNHA Review

No abstract provided.

On Black Speculative Feminisms: Memory And Liberated Futures In Black Women’S Fiction, Aisha Matthews

Criticism

Black Speculative Feminisms: Memory and Liberated Futures in Black Women’s Fiction by Cassandra L. Jones. Ohio State University Press, 2024. $29.95 paperback

On Monstrous Work & Radical Satisfaction: Black Women Writing Under Segregation, Courtney Thorsson

Criticism

Review of Monstrous Work & Radical Satisfaction: Black Women Writing Under Segregation by Eve Dunbar.

There's No Vision Like Low Vision: Living With And Serving Those With Macular Degeneration And Stargardt Macular Dystrophy, Paul B. Freeman Od

Optometric Clinical Practice

Book Review: Perski T, There's No Vision Like Low Vision: Living with and Serving Those with Macular Degeneration and Stargardt Macular Dystrophy, Inicio Press, 2025. 306 pages, Paperback, $14.99, ISBN 978-1-998315-48-2, Kindle $9.99 ISBN 978–1– 998315– 49–9

Outcomes Of A Vision Care Program That Provides Comprehensive Eye Exams To Children Who Have Failed School Screenings In The San Antonio Northside Independent School District, Raelyn Ottenbreit Od, Timothy Wingert Od, Chantelle Ribisi Od, Elizabeth Marunde Od

Optometric Clinical Practice

Purpose: To determine the impact of a program that provides a comprehensive eye exam to children who failed a vision screening.

Method: Seven hundred seventeen students from the San Antonio Northside Independent School District (NISD) received a comprehensive eye examination. The records of these students were retrospectively analyzed to determine the impact of the exam on this population.

Results: The mean improvement in visual acuity after receiving a comprehensive eye exam at the Rosenberg School of Optometry was approximately five- and one-half lines of acuity. In addition to refractive error, other conditions related to eye coordination and ocular …

The Other Visual Acuity, Paul B. Freeman Od

Optometric Clinical Practice

Editorial

Technical Disclosure Specification: Project Tectonex - Spec 172, Christopher L. Eckes

Defensive Publications Series

This technical specification details the structural architecture, mathematical governing frameworks, and biological boundary safety parameters for TECTONEX, a modular metamaterial panel mesh engineered to isolate critical infrastructure from transient high-flux thermal, kinetic, and elastodynamic loads. Moving away from passive, mass-based armor systems, the TECTONEX matrix synthesizes porous macrovascular fluidics, wave-trapping single-crystal grids, and active near-field acoustic levitation boundaries into a self-powering, closed-loop structural unit.

By converting external threat momentum into localized internal magnetohydrodynamic (MHD) currents, the panel autonomously scales its internal dampening properties. The design incorporates a reverse-angled Helmholtz acoustic louver pathway to guarantee complete attenuation of toxic infrasonic, ultrasonic, …

Tree-Based Evaluation Of Univariate Polynomials Over Mersenne-31 On Fpga, Ali Mkhida Mr

Defensive Publications Series

This work presents a tree-based FPGA architecture for evaluating univariate polynomials over the Mersenne-31 prime field F_p, where p = 2^31 - 1, a finite field used in modern zero-knowledge proof systems and STARK-oriented arithmetic. Instead of the serial dependency structure of Horner evaluation, the proposed method stores polynomial coefficients in bit-reversed order and evaluates them through a complete binary tree using the powers r, r^2, r^4, ..., r^(2^i) of the evaluation point.

For a polynomial with N coefficients, where N is a power of two, the construction requires exactly N-1 finite-field multiplications and N-1 additions, matching the arithmetic work …