James (Jake) Gearon
James (Jake) Gearon

Postdoctoral researcher · UNC Chapel Hill

Reading rivers from orbit.

Sedimentologist and geoinformaticist studying how rivers organize landscapes and where they will go next. Postdoc at UNC Chapel Hill's Global Hydrology Lab.

Current work uses SWOT satellite data to image coastal backwater profiles globally, identifying regions vulnerable to compound flood hazards and avulsion.

01

Research

01 — Question

Where rivers go.

Predicting the path of an avulsing river before it moves. The geometric signatures in floodplain topography that encode avulsion risk — and how they change downstream.

Global distribution of river avulsions

Nature · 2024

Rules of river avulsion change downstream

A framework for predicting where rivers leave their channels. The geometry that controls avulsion shifts predictably along a river — and the rules differ between fans, alluvial plains, and deltas. Built from 174 post-1984 avulsions, mapped from satellite imagery and SRTM topography.

Gearon, Martin, DeLisle, Barefoot, Mohrig, Paola, Edmonds

14 rivers analyzed for avulsion precursors

Geophysical Research Letters · 2025

Avulsion precursors encoded in alluvial ridge geometry

A follow-on. The shape of the alluvial ridge around a channel records imminent avulsion risk before the channel breaks. A topographic precursor signal you can read from a DEM.

Gearon, Edmonds

02 — Question

How coasts feel the ocean.

How far upstream tidal and backwater influence extends, and how that distance changes with discharge, sea level, and sediment supply. Where rivers stop being rivers.

SWOT water surface elevation profiles, Mississippi River, colored by discharge

In progress · UNC Chapel Hill, 2025–

Backwater profiles, globally

Current postdoctoral work uses SWOT satellite altimetry to image coastal backwater profiles across continents — identifying which deltas and lower-river systems carry signatures of ocean influence inland, and where compound flood hazards and avulsion risk intersect. Paper forthcoming.

Gearon, Pavelsky, et al.

03 — Question

What landscapes remember.

How sedimentary systems record, preserve, and erase signals of environmental change. What gets written into the rock, and what gets overwritten.

Annotated outcrop, Nine Mile Canyon

Journal of Sedimentary Research · 2022

The supply-generated sequence

A unified sequence-stratigraphic model for closed lacustrine basins. Sediment supply — not eustasy — drives the cyclic motifs preserved in lake systems. Built from 22 km of outcrop logging in the Eocene Green River Formation, Nine Mile Canyon, Utah.

Gearon, Olariu, Steel

04 — Question

Process from pattern.

Reading active surface and subsurface processes from the patterns they leave behind — including the patterns life makes on top of them.

King Clone creosote ring, Mojave Desert

Landscape Ecology · 2020

Geomorphic controls on shrub canopy volume and spacing

Creosote bush canopies record the geomorphic surface they grow on. Across 22 million shrubs in the northern Mojave, canopy volume and spacing track the underlying surface — alluvial fans versus playa versus piedmont — well enough to read landform from vegetation alone.

Gearon, Young


02

All publications

  1. 2026
    JGR-ES

    O levee, where art thou? Measuring the abundance of natural river levees across the contiguous USA

    Barefoot, Gearon, Edmonds

  2. 2025
    arXiv

    Fighting Fires from Space: Vision Transformers for Wildfire Detection

    Agarwal, Gearon, Rank, Chenevert

  3. 2025
    GRL

    River avulsion precursors encoded in alluvial ridge geometry

    Gearon, Edmonds

  4. 2025
    Icarus

    Martian chaos terrain fracture geometry

    Levy, Subak, Armstrong, King, Kuang, Kuentz, Gearon, Naylor, Rapoza, Wang

  5. 2024
    AGU Adv.

    Topographic roughness as an emergent property of geomorphic processes and events

    Doane, Gearon, Martin, Yanites, Edmonds

  6. 2024
    Nature

    Rules of river avulsion change downstream

    Gearon, Martin, DeLisle, Barefoot, Mohrig, Paola, Edmonds

  7. 2024
    Sed. Geol.

    Increased sediment connectivity between deltas and deep-water fans in closed lake basins

    Liu, Gong, Gearon, et al.

  8. 2022
    JSR

    The supply-generated sequence: A unified sequence-stratigraphic model for closed lacustrine sedimentary basins

    Gearon, Olariu, Steel

  9. 2020
    Land. Ecol.

    Geomorphic controls on shrub canopy volume and spacing of creosote bush, northern Mojave Desert

    Gearon, Young