Preprints
There are 6798 Preprints listed.
River Paradigm for Sedentary Mammoth Hunters
Published: 2026-04-10
Subjects: Environmental Studies
Simple forensic systems analysis of Upper Paleolithic mammoth procurement, including analysis of foraging radii, taphonomic representation, portability, caloric costs, hunting and transportation energetics, labor economics, socio-economic and personal vulnerability to predators, and material-handling logistics, prove Upper Paleolithic Mammuthus primigenius were not often hunted, scavenged, [...]
The Evolution of Digital Twins in Hydrology and Environmental Science: From Physical Models to AI-Assisted Autonomous Systems
Published: 2026-04-10
Subjects: Civil and Environmental Engineering, Environmental Engineering
Digital Twin (DT) technologies have emerged as transformative framework in hydrology, enabling adaptive, real-time modeling of water systems through data-driven intelligence. This position paper proposes a five-level technological evolution model for hydrological digital twins, tracing field’s progression over the last three decades (1995-2025) from physical models to autonomous & [...]
Persistent Geochemical Zonation (“Striping”) within the Galápagos Mantle Plume
Published: 2026-04-10
Subjects: Earth Sciences, Physical Sciences and Mathematics
Some hotspot tracks, such as those formed by the Hawai’i and Galápagos mantle plumes, exhibit long-lived cross-track isotopic zonation, thought to reflect the streaking out of heterogeneous material in the plume conduit during upwelling. In lavas associated with the Galápagos mantle plume, three geochemical domains, present for at least 15 Myr, have been identified: northern, southern and [...]
Coupling Coordination and Driving Mechanisms of Land Use and Ecosystem Service Value in the Central Yunnan Urban Agglomeration
Published: 2026-04-10
Subjects: Environmental Studies
ABSTRACT Research Content: This study focuses on the Central Yunnan Urban Agglomeration, analyzing the spatiotemporal evolution characteristics, coupling coordination relationship, and driving mechanisms of land use and ecosystem service value (ESV) from 2010 to 2024. It aims to provide a scientific basis for regional territorial spatial optimization and ecological civilization [...]
HydroScholar AI: A Collaborative Agent for End-to-End Automated Hydrological Research Lifecycle
Published: 2026-04-09
Subjects: Computer Sciences, Earth Sciences, Environmental Sciences, Physical Sciences and Mathematics
Hydrological research relies on multi-stage computational workflows that are often slow, fragmented across disparate tools, and inconsistently documented, limiting reproducibility. This study presents HydroScholar AI, an agentic, human-in-the-loop platform that consolidates the plan-to-paper research lifecycle into a single interactive automated framework. From a natural-language prompt, the [...]
Assessing Future Temperature and Precipitation Responses to Solar Radiation Management in Bangladesh: A Comparative Analysis with SSP Scenarios
Published: 2026-04-09
Subjects: Other Life Sciences
Bangladesh is among the most climate-vulnerable nations globally, facing compounding risks from rising temperatures, shifting precipitation patterns, and intensifying extreme events. This study assesses projected changes in precipitation, maximum temperature (Tmax), and minimum temperature (Tmin) over Bangladesh under two emission pathways — SSP2-4.5 and SSP5-8.5 — and two Solar Radiation [...]
From geochemical to biogeochemical cycles: an organizational view of how (and why) life shaped its conditions of existence
Published: 2026-04-09
Subjects: Biochemistry, Biophysics, and Structural Biology, Biodiversity, Biogeochemistry, Earth Sciences, Life Sciences
Since the seminal work of Maturana and Varela, the Organizational Approach (OA) has defended an organism-centered view of life. This paper argues that the OA must be extended to include the historical, ecological and geochemical processes that sustain biological systems across scales. We develop a multiscale account of closure of constraints (CoC) in which localized closures can emerge and [...]
Calculation of Slope Terrain Movement Rate from Tree Trunk Deformation
Published: 2026-04-09
Subjects: Engineering
Movement of terrain on slopes, unless intense, as in the case of landslides, is practically imperceptible and the deformed trunks of trees growing on slopes are detectors of these movements. The deformation of a tree trunk may therefore be considered as a continuous record of terrain movement for the period of tree vegetation life. The cause of trunk deformation is a slight change in the [...]
Inverse computational morphology of debris and alluvial fans
Published: 2026-04-09
Subjects: Geographic Information Sciences, Geomorphology, Hydraulic Engineering, Hydrology, Numerical Analysis and Scientific Computing
In mountain areas, debris flows and fluvial transport often build up conical deposits at the confluence between steep tributaries and trunk rivers. The resulting debris and alluvial fans typically exhibit a well-defined relationship between slope or elevation and the distance from the fan apex. This relationship, however, becomes more difficult to characterize when fans are constrained by the [...]
Modeling PDC cutter-rock interactions using finite discrete element method for geothermal drilling applications
Published: 2026-04-09
Subjects: Earth Sciences, Physical Sciences and Mathematics
Polycrystalline diamond compact (PDC) cutters are used in geothermal energy drilling operations as they are exceptionally effective due to their strength and resistance to abrasion. It is important to understand the effect of downhole conditions to accurately model rock-cutter-rock interactions, as well as wear on the bit and drilling efficiency. Cutting efficiency is determined through the [...]
Automated Detection of Slow Slip Events from InSAR: Application to the North Anatolian Fault
Published: 2026-04-09
Subjects: Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure
The growing volume of InSAR time series offers new opportunities to systematically detect transient aseismic deformation, but identifying low-amplitude slow slip events (SSEs) remains challenging due to noise and limited temporal resolution. Here, we adapt the geodetic matched filter, originally developed for GNSS data, to InSAR displacement time series in the context of shallow strike-slip [...]
PharmGuard: A blockchain and LLM-integrated framework with provenance-aware anomaly scoring for securing pharmaceutical supply chains
Published: 2026-04-09
Subjects: Computer Engineering
Counterfeit and substandard medicines remain a major global health threat, underscoring the need for end-to-end traceability and proactive monitoring across pharmaceutical supply chains. This paper presents PharmGuard, a framework that combines a permissioned blockchain ledger (Hyperledger Fabric) for tamper-evident provenance with a large-language-model analytics layer for detecting anomalous [...]
Paleomagnetic data from the Qaidam Block quantify post-middle Triassic convergence preceding eastern Eurasian assembly
Published: 2026-04-09
Subjects: Geology
Amalgamation of East Asian blocks with Eurasia involved progressive closure of several oceanic basins preserved as sutures. Since the Permian, the North China Block has undergone ~2500 km of paleolatitudinal motion relative to Eurasia, forming Mongol–Okhotsk suture in the north. Surprisingly, no evidence in its western part has been found to coordinate this motion, which is essential for a triple [...]
Quantifying the Regional Dynamics and Redistribution of Physical Vulnerability in Least Developed Countries
Published: 2026-04-09
Subjects: Categorical Data Analysis, Civil Engineering, Environmental Indicators and Impact Assessment, Environmental Monitoring, Geographic Information Sciences, Other Computer Sciences, Physical and Environmental Geography, Remote Sensing, Spatial Science, Structural Engineering
In the margins of the accelerating development of digital technology worldwide are the Least Developed Countries (LDCs), which continually face an exacerbated risk crisis at the intersection of rapid rural-urban growth, persistent physical vulnerability, and intensifying climate hazards. Despite decades of international development commitments, the rate of built-up expansion across LDCs has [...]
Simulation of Groundwater Flow To Evaluate Hydrogeologic Controls on a PFAS Plume, Coakley Landfill Superfund Site, Rockingham County, New Hampshire
Published: 2026-04-09
Subjects: Earth Sciences, Environmental Health and Protection, Environmental Sciences, Geology, Hydrology, Physical Sciences and Mathematics, Water Resource Management
Per- and polyfluoroalkyl substances (PFAS), including perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), have been detected at combined concentrations above 2,000 nanograms per liter (ng/L) at groundwater seep locations near the Coakley Landfill Superfund site, in North Hampton, New Hampshire. The landfill was active from 1972 to 1985. An impermeable cap was placed on the [...]