Students & Postdocs

Visiting grad student Haein Shin with Morgan, Bella, Madison and Grace, admiring bedrock channel block plucking in the Guadalupe Mtns, TX

 

Grace Guryan, Ph.D. student, started fall 2020.  Expected completion Summer 2025.

Project:  Lithologic and sediment controls on landscape form and evolution in the Guadalupe Mountains, TX and NM

 

 

 

Morgan Carrington, Ph.D. student (coadvised by Tim Goudge), started fall 2022.

Project:  Hydrologic and lithologic controls on Canyon evolution on Mars vs. the Colorado Plateau

 

 

 

 

Madison Preece, Ph.D. student, started fall 2022.

Project:  Lithologic controls on Himalayan erosion and tectonics

 

 

 

 

Bella Gray, Undergraduate researcher, Spring 2022-December 2023.

Gray B, *G Guryan G, JPL Johnson (2023). Exploring Methods for Quantifying the Influences of Boulder Concentration on Channel Steepness and Width in Guadalupe Mountains, New Mexico and West Texas, USA. Abstract EP32A-02, presented at 2023 Fall Meeting, AGU, San Francisco, 11-15 Dec.  (Oral presentation)

 

Sean Coen, Undergraduate researcher, started Fall 2023

  • Project:  Martian Canyon Headwalls from HiRISE

 

 

 

Natalie Jackson, Undergraduate researcher, started Spring 2021

  • Project:  Channel width scaling in the Atacama Desert, Chile

 

Paul Southard (coadvised by Daniella Rempe), M.S. in Geological Sciences, August 2019.

Southard, PJ, JPL Johnson, DM Rempe, AM Matheny (2022), Impacts of vegetation on dryland river morphology: Insights from spring-fed channel reaches, Henry Mountains, Utah. Water Resources Research, 58,e2021WR031701. https://doi.org/10.1029/2021WR031701

 

 

Emily Bradshaw Marino, M.S. in Geological Sciences, May 2017.

  • Thesis:  Isolating lithologic controls on landscape morphology in the Guadalupe Mountains, New Mexico and Texas.

Juliana J Spector, M.S. in Geological Sciences, August 2017.

  • Thesis:  Feedbacks between dissolution, abrasion, and bed roughness: A flume investigation of carbonate bedrock incision.

Kealie Goodwin Pretzlav, Ph.D. in Geological Sciences, August 2016

  • Thesis:  Armor development and bedload transport processes during snowmelt and flash floods using laboratory experiments, numerical modeling, and field-based motion-sensor tracers.
  • Pretzlav, K. L. G., Johnson, J. P. L., & Bradley, D. N. (2021). Smartrock transport from seconds to seasons: Shear stress controls on gravel diffusion inferred from hop and rest scaling. Geophysical Research Letters, 48, e2020GL091991. https://doi.org/10.1029/2020GL091991
  • Pretzlav, K. L. G., Johnson, J. P. L., & Bradley, D. N. (2020). Smartrock transport in a mountain stream: Bedload hysteresis and changing thresholds of motion. Water Resources Research, 56, e2020WR028150. https://doi.org/10.1029/2020WR028150

Brendan Murphy, Ph.D. in Geological Sciences, August 2016

  • Assistant Professor, Simon Fraser University:  https://www.brendanpmurphy.org/
  • Thesis:  Feedbacks among chemical weathering, rock strength and erosion with implications for the climatic control of bedrock river incision.
  • Murphy BP, JPL Johnson, NM Gasparini,GS Hancock, EE Small (2018), Weathering and abrasion of bedrock streambed topography, Geology, 46 (5): 459-462, https://doi.org/10.1130/G40186.1
  • Murphy BP, JPL Johnson, NM Gasparini, LS Sklar (2016), A mechanism for the climatic control of bedrock river incision, Nature, 532, 223-227, https://doi.org/10.1038/nature17449 

Yael Storz-Peretz, Postdoctoral Researcher, February-May 2016

  • Project:  Experimental flash flood bore hydraulics, sediment transport, and grain size sorting.
  • Thappeta SK, JPL Johnson, E Halfi, Y Storz-Peretz, JB Laronne (2023), Bed Shear Stress in Experimental Flash Flood Bores over Dry Beds and Over Flowing Water: A Comparison of Methods.  Journal of Hydraulic Engineering, https://doi.org/10.1061/JHEND8.HYENG-13029

Lindsay Olinde, Ph.D. in Geological Sciences, May 2015

  • Thesis:  Displacement and entrainment behavior or bedload clasts in mountain streams.
  • Olinde LJ, JPL Johnson (2015), Using RFID and accelerometer-embedded tracers to measure probabilities of bed load transport, step lengths, and rest times in a mountain stream, Water Resources Research, 51, 7572-7589, doi: 10.1002/2014WR016120
  • Check out Lindsay’s 2022 presentation on Blackland Prairie streams!

Megan Ferre,  M.A. in Geological Sciences, May 2015

Alexander Aronovitz (co-advised with Wonsuck Kim), M.S. in Geological Sciences, May 2012.

  • Thesis:  Effects of sediment supply and slope on channel topographic roughness and sediment transport.
  • Johnson, JPL, AC Aronovitz, W Kim (2015), Coarser and rougher: Effects of fine gravel pulses on experimental step-pool channel morphodynamics, Geophys. Res. Lett., 42, 8432–8440, https://doi.org/10.1002/2015GL066097