EP22A:
The Role and Relevance of Thresholds, Event Variability, and Disturbances Across Landscapes II


Submit an Abstract to this Session


Session ID#: 61771

Session Description:
Landscape form reflects the interaction of geomorphic processes and the variable environmental conditions that drive these processes across space and time.  This integration can be complicated by thresholds for the initiation of landscape change, landscape resilience,  the variability and sequencing of past geomorphic events, and distinct disturbances caused by extreme conditions. However, the role and specific importance of thresholds, event variability, and extremes on the dominant processes and resultant form of landscapes remains largely undefined. While thresholds can filter the environmental signals that drive landscape and landform response, the form still measurably reflects portions of the distribution and the sequencing of a particular forcing. Additionally, the tails of these distributions, or extreme disturbances, may set the physical template of drainage basins and influence broad-scale landscape evolution.

We welcome field, experimental, theoretical, and modeling efforts focused on the determination, applications, and relevance of thresholds, event variability, and disturbances across landscapes.

Primary Convener:  Allison M Pfeiffer, University of Washington, Seattle, United States
Conveners:  Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States and Eric Deal, ETH, Zürich, Switzerland
Primary Liaison:  Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States
Chairs:  Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States, Jeff Prancevic, Caltech, Pasadena, CA, United States, Eric Deal, ETH, Zürich, Switzerland and Allison M Pfeiffer, University of Washington, Seattle, United States
OSPA Liaison:  Jeff Prancevic, Caltech, Pasadena, CA, United States
Index Terms:

1815 Erosion [HYDROLOGY]
1817 Extreme events [HYDROLOGY]
1824 Geomorphology: general [HYDROLOGY]
1861 Sedimentation [HYDROLOGY]

Abstracts Submitted to this Session:

Supply-limited versus kinetically-limited chemical erosion in the Klamath Mountains, USA (439776)
Nicole West, Central Michigan University, Mount Pleasant, MI, United States and Ken Ferrier, University of Wisconsin-Madison, Geoscience, Madison, United States
Weathering thresholds and the resilience of soils in mountainous systems (Invited) (440838)
Jean Dixon, Montana State University-Bozeman, Bozeman, MT, United States, Sarah Benjaram, Montana State University, Bozeman, MT, United States, Colin A Quinn, NASA GSFC/UMD ESSIC, Biospheric Sciences, College Park, United States and Kailey Adams, Montana State University, Earth Sciences, Bozeman, MT, United States
Quantifying the Impact of Successive Wildfires on Soil Hydraulic Properties and Debris Flow Hazards (422204)
Luke McGuire, University of Arizona, Department of Geosciences, Tucson, United States and Ann Youberg, University of Arizona, Arizona Geological Survey, Tucson, AZ, United States
Variable Thresholds in Rivers: Causes and Effects (Invited) (363671)
Charles Shobe, University of Colorado at Boulder, Department of Geological Sciences, Boulder, CO, United States, Gregory E Tucker, University of Colorado at Boulder, Department of Geological Sciences and CIRES, Boulder, United States and Matthew Rossi, University of Colorado at Boulder, Earth Lab and CIRES, Boulder, United States
Geomorphic Response to Extreme Floods: from Process Understanding to Hazard Assessment (Invited) (352243)
Nicola Surian, University of Padua, Padua, Italy
Elevated post-event sediment yield extends the impact of catastrophic flooding (447895)
Evan Dethier, Dartmouth College, Department of Earth Sciences, Hanover, NH, United States, Frank J Magilligan, Dartmouth College, Geography, Hanover, NH, United States and Carl E Renshaw, Dartmouth College, Department of Earth Sciences & Thayer School of Engineering, Hanover, NH, United States
Disturbance and recovery at multiple temporal scales – Diamond Fork River, Utah (460340)
Jabari Jones, Bowdoin College, Earth and Oceanographic Science, Brunswick, ME, United States, Patrick Belmont, Utah State University, Department of Watershed Sciences, Logan, UT, United States and Peter R Wilcock, Utah State University, Watershed Sciences, Logan, UT, United States
Measuring and Modeling Disequilibrium Gravel Transport and Threshold Evolution During Natural Floods (Invited) (344343)
Joel P L P Johnson1, Kealie Pretzlav2, Lindsay Olinde3, Claire C Masteller4, D. Nathan Bradley5, Jens Martin Turowski4 and Dieter Rickenmann6, (1)University of Texas at Austin, Department of Earth and Planetary Sciences, Jackson School of Geosciences, Austin, TX, United States, (2)Balance Hydrologics, Inc., Berkeley, CA, United States, (3)City of Austin, Watershed Protection Department, Austin, TX, United States, (4)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (5)Bureau of Reclamation Denver, Denver, CO, United States, (6)WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland

See more of: Earth and Planetary Surface Processes