EP21A:
The Role and Relevance of Thresholds, Event Variability, and Disturbances Across Landscapes I


Submit an Abstract to this Session


Session ID#: 61777

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:  Jeff Prancevic, Caltech, Pasadena, CA, United States and Frank J Magilligan, Dartmouth College, Geography, Hanover, NH, United States
Primary Liaison:  Jeff Prancevic, Caltech, Pasadena, CA, United States
Chairs:  Jeff Prancevic, Caltech, Pasadena, CA, United States, Frank J Magilligan, Dartmouth College, Hanover, NH, United States and Allison M Pfeiffer, University of Washington, Seattle, United States
OSPA Liaison:  Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States
Index Terms:

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

Abstracts Submitted to this Session:

Alluvial Fan Aggradation and Incision in the Southwestern USA is Controlled by a Climatic Threshold (367412)
Mitch Keith D'Arcy, University of Potsdam, Potsdam, Germany, Pedro N DiNezio, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States and Taylor F. Schildgen, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany
Processes in terrace formation: threshold conditions for meandering and channel width adjustments (376815)
Sarah A Schanz1, Brian J Yanites2 and Douglas A Edmonds2, (1)Indiana University Bloomington, Earth and Atmospheric Sciences, Bloomington, IN, United States, (2)Indiana University Bloomington, Department of Earth and Atmospheric Sciences, Bloomington, IN, United States
The imprint of discharge variability on bedrock river incision on the Hawaiian island of Kaua'i (Invited) (397207)
Huppert Kim1, Eric Deal2, J Taylor Perron3, Ken Ferrier4 and Jean Braun1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Massachusetts Institute of Technology, Earth, Atmospheric, and Planetary Sciences, Cambridge, United States, (3)Massachusetts Institute of Technology, Department of Earth, Atmospheric, & Planetary Sciences, Cambridge, United States, (4)Georgia Institute of Technology, Earth and Atmospheric Sciences, Atlanta, GA, United States
The effect of alteration in flow duration curve on bankfull channel discharge and bankfull cross-sectional shape: model application to the Minnesota River, USA (400397)
Kensuke Naito, Universidad de Ingenieria y Tecnologia - UTEC, Centro de Investigación y Tecnología del Agua - CITA, Lima, Peru and Gary Parker, University of Illinois at Urbana Champaign, Earth Science and Environmental Change & Civil and Environmental Engineering, Urbana, United States
Is pool-riffle formation a threshold driven phenomenon in low sinuosity settings? (442440)
Shawn M Chartrand, Vanderbilt University, Nashville, TN, United States, Mark Jellinek, Univ British Columbia, Vancouver, BC, Canada, Marwan A Hassan, University of British Columbia, Department of Geography, Vancouver, BC, Canada and Carles Ferrer-boix, Tech. University of Catalonia, Barcelona, Spain
Field Investigation of the Influence of Bank-Toe Critical Shear Stress on Suspension-River Hydraulic Geometry (388016)
Kieran Bernard Jiamin Dunne, Rice University, Department of Earth, Environmental, and Planetary Sciences, Houston, United States and Douglas J Jerolmack, University of Pennsylvania, Department of Earth and Environmental Science, Philadelphia, United States
Towards understanding the effects of variable wave forcing on sea cliff erosion and stability using seismic methods (Invited) (362401)
Claire C Masteller1, Michael Dietze VI2, Kristen L Cook3 and Niels Hovius2, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Deutsches GeoForschungsZentrum GFZ, Section 4.6 Geomorphology, Potsdam, Germany, (3)IRD, ISTerre, Université Grenoble Alpes, Meylan, France
Storm Impacts on Estuarine Marshes (407960)
Jonathan D Woodruff, University of Massachusetts Amherst, Department of Earth, Geographic, and Climate Sciences, Amherst, United States, Brian Yellen, University of Massachusetts Amherst, Earth, Geographic, and Climate Sciences, Amherst, United States, W Rockwell Geyer, Woods Hole Oceanographic Institution, Applied Ocean Physics and Engineering, Woods Hole, MA, United States, Wouter Kranenburg, Deltares, Hydrodynamics and Forecasting, Delft, Netherlands, Noa Randall, Smith College, Northampton, MA, United States and Justin B Richardson, University of Virginia, Department of Environmental Sciences, Charlottesville, United States

See more of: Earth and Planetary Surface Processes