Teaching

Courses at SFU

GEOG 311 Hydrology

Introduction to the hydrologic cycle, with an emphasis on the hydrology of British Columbia.
Typically offered every fall semester. Course outline

GEOG 418 Ecohydrology

Interdisciplinary exploration of the interactions between plants and hydrologic processes, with an emphasis on primary literature.
Typically offered in spring semesters. Course outline

GEOG 606 Research Design and Analytical Techniques in Physical Geography

Research design, data collection and quantitative methods in physical geography.
Typically offered every fall semester. Course outline

Elder Creek

People

Contact Jesse to learn about opportunities.

W. Jesse Hahm

Assistant Professor (January, 2020 - present), Department of Geography, Simon Fraser University

Academic Background

Postdoctoral Scholar, Jackson School of Geosciences, University of Texas-Austin
PhD, Earth and Planetary Science, University of California-Berkeley
MSc, Geology and Geophysics, University of Wyoming
BA, McGill University

Christine Leclerc

Department of Geography, Simon Fraser University

Christine Leclerc is an undergraduate in Physical Geography at Simon Fraser University and an NSERC-USRA award recipient. She has received support from SFU’s Faculty of Environment and the Pacific Institute for Climate Solutions to train overseas in the area of climate policy. In 2019, Leclerc attended UN Climate Change’s COP25 event to help advance climate literacy. In 2020, Leclerc was selected to present on the reversibility of climate change at the SFU Undergrad Research Symposium. She is interested in earth system response to climate forcing and tools to improve policy-maker ability to protect long-term environmental resource availability. As part of Dr. Hahm’s hydrology lab, Leclerc co-investigates controls on surface flow and stream network response to change in precipitation regime.

Sijin Chen

Environmental Science, Simon Fraser University

Sijin is an undergraduate environmental science student at Simon Fraser University. As an honours student, she is working with Jesse to investigate the relationship between subsurface water storage and plant productivity. She also developed field sampling and laboratory analysis skills by working at a research centre under Agriculture and Agri-Food Canada. Her research interests lie in exploring how computing techniques such as Google Earth Engine and Python can be applied in geology and environmental science.

Former members

Dr. Dana Lapides, Research Assistant

Publications

Google Scholar Profile

Manuscripts in review/revision/pre-print stage

  • Variability of headwater stream network extents controlled by flow regime and network hydraulic scaling.
    DA Lapides, CD Leclerc, H Moidu, DN Dralle, WJ Hahm. pre-print.
    (pre-print website - external link).
  • Scale-dependence of bedrock weathering and water storage depths across a sequence of ridges and valleys.
    MA Pedrazas, WJ Hahm, MH Huang, DN Dralle, MD Nelson, R Breunig, K Fauria, AB Bryk, WE Dietrich, DM Rempe. in review.
  • Low chemical weathering rates cause water-stressed Andean rivers to dry up.
    E Dingle, WJ Hahm, JG Venditti. in review.

Published

  • Oak transpiration drawn from the weathered bedrock vadose zone in the summer dry season.
    WJ Hahm, DM Rempe, DN Dralle, TE Dawson, WE Dietrich. Water Resources Research. 2020
    (journal website - external link), (pdf).
  • Plants as sensors: vegetation response to rainfall predicts root-zone water storage capacity in Mediterranean-type climates.
    DN Dralle, WJ Hahm, DM Rempe, NJ Karst, LDL Anderegg, SE Thompson, TE Dawson, WE Dietrich. Environmental Research Letters. 2020.
    (journal website - external link), (pdf).
  • Digging deeper: what the critical zone perspective adds to the study of plant ecophysiology.
    TE Dawson, WJ Hahm, K Crutchfield-Peters. New Phytologist. 2020.
    (journal website - external link), (pdf).
  • Low subsurface water storage capacity relative to annual rainfall decouples Mediterranean plant productivity and water use from rainfall variability.
    WJ Hahm, DN Dralle, DR Rempe, AB Bryk, SE Thompson, TE Dawson, WE Dietrich. Geophysical Research Letters, 2019.
    (journal website - external link), (pdf).
  • Lithologically controlled subsurface critical zone thickness and water storage capacity determine regional plant community composition.
    WJ Hahm, DR Rempe, DN Dralle, TE Dawson, SM Lovill, AB Bryk, D Bish, J Schieber, WE Dietrich. Water Resources Research, 2019.
    (journal website - external link), (pdf).
  • Arrested development: Erosional equilibrium in the southern Sierra Nevada, California, maintained by feedbacks between channel incision and hillslope sediment production.
    RP Callahan, KL Ferrier, JC Dixon, A Dosseto, WJ Hahm, BS Jessup, SN Miller, C Hunsaker, D Johnson, LS Sklar, & CS Riebe, Geological Society of America Bulletin, 2019.
    (journal website - external link), (pdf).
  • Controls on the distribution and resilience of Quercus garryana: ecophysiological evidence of oak’s water-limitation tolerance.
    WJ Hahm, WE Dietrich, TE Dawson. Ecosphere, 2018.
    (journal website - external link), (pdf).
  • Drainage from the critical zone: lithologic controls on the persistence and spatial extent of wetted channels during the summer dry season.
    SM Lovill, WJ Hahm, WE Dietrich. Water Resources Research, 2018.
    (journal website - external link), (pdf).
  • Quantification of the seasonal hillslope water storage that does not drive streamflow.
    DN Dralle, WJ Hahm, DM Rempe, NJ Karst, SE Thompson, WE Dietrich. Hydrological Processes, 2018.
    (journal website - external link), (pdf).
  • Controls on deep critical zone architecture: A historical review and four testable hypotheses.
    CS Riebe, WJ Hahm, SL Brantley. Earth Surface Processes and Landforms, 2016.
    (journal website - external link), (pdf).
  • Testing for supply-limited and kinetic-limited chemical erosion in field measurements of regolith production and chemical depletion.
    KL Ferrier, CS Riebe, WJ Hahm. Geochemistry, Geophysics, Geosystems, 2016.
    (journal website - external link), (pdf).
  • Bedrock composition regulates mountain ecosystems and landscape evolution.
    WJ Hahm, CS Riebe, CE Lukens, S Araki. Proceedings of the National Academy of Sciences, 2014.
    (journal website - external link), (pdf).
    See also: Coevolution of life and landscapes (Commentary). (pdf), (journal website - external link) S Porder. Proceedings of the National Academy of Sciences, 2014.
  • Landscape response to tipping points in granite weathering: The case of stepped topography in the Southern Sierra Critical Zone Observatory.
    BS Jessup, WJ Hahm, SN Miller, JW Kirchner, CS Riebe. Applied Geochemistry Supplement, 2011.
    (journal website - external link), (pdf).
  • Critical Zone Ecohydrology of the Northern California Coast Ranges (PhD Dissertation).
    WJ Hahm, 2019.
    (eScholarship website - external link), (pdf).
Rancho Venada

Outreach and Press

  • SFU Research News: Will bedrock save our coastal ecosystems from climate change?. (external link), 2020
  • EOS Science Update: Linking Critical Zone Water Storage and Ecosystems. (external link), 2020
  • Ringing in the Hydrological New Year: Interview on Mediterranean Ecohydrology and Eel River CZO discoveries and resolutions with David Dralle, Mary Ann Madej, Tim Bailey, and Chip Tittman. KMUD's Institute for Sustainable Forestry Hour - Redwood Community Radio) (~60 minute MP3 recording), 2019
  • UC Berkeley Press Release: Does limited underground water storage make plants less susceptible to drought? (external link), 2019
  • EOS Research Spotlight: Answer to California Landscape Riddle Lies Underground. (external link), 2019
  • Cyanobacteria: ancient life in the Eel River Ecosystem (Link to video stream on Vimeo), 2019
  • Oregon White Oak's future and bedrock-plant-stream interactions in the Northern California Coast Ranges (Interview with KMUD's Monday Morning Magazine - Redwood Community Radio) (~20 minute MP3 recording), 2018
  • Studying the Eel River Watershed (Video for interactive exhibit at the Lawrence Hall of Science) (external link - Youtube), 2017
  • Complex Research Program Moving Ahead at Livermore Woman’s Ranch. (external link) Livermore Independent, 2016. (pdf)
  • National Study Taking Place At Livermore Woman’s Ranch. (external link) Livermore Independent, 2015. (pdf)
  • Sierra Nevada bedrock shapes vegetation and topography. (pdf) Oleson, T, Earth Magazine, 2014.
  • UW Study: Bedrock Influences Forests More Than Previously Believed. (external link) University of Wyoming Press Release, 2014.
  • World's Largest Trees Help Explain California Forests' Bald Spots. (external link) Livescience.com article, 2014; Scientific American version: (external link)
  • Study Finds Forest Growth Dictated By Bedrock, Not Just Climate. (external link) Wyoming Public Media, 2014.
  • Granite bedrock and sequoia forests 'communicate' in the Sierra Nevada. (external link) National Science Foundation, 2014.
  • Granite Contributions to the Sierra Nevada. (external link) California Academy of Sciences, 2014.
Quercus garryana