EP23G:
The Role and Relevance of Thresholds, Event Variability, and Disturbances Across Landscapes Posters


Submit an Abstract to this Session


Session ID#: 61634

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:  Eric Deal, Massachusetts Institute of Technology, Earth, Atmospheric, and Planetary Sciences, Cambridge, United States and Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States
Primary Liaison:  Allison M Pfeiffer, University of Washington, Seattle, United States
Chairs:  Allison M Pfeiffer, University of Washington, Seattle, United States, Eric Deal, University of Grenoble-Alpes, ISTerre, Grenoble, France and Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States
OSPA Liaison:  Eric Deal, University of Grenoble-Alpes, ISTerre, Grenoble, France
Index Terms:

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

Abstracts Submitted to this Session:

Yellow River channel migration and regional environmental evolution of the Hetao Plain from sedimentary cores , North of China (472735)
Jinglu Wu, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China and Jingzhong Wang, Experiment & Practice Teaching Center, Heibei GEO University, Shijiazhuang, China
Modeling post-wildfire hydrology and debris flow timing using a regionally generalizable approach (398627)
Francis K Rengers, USGS Geologic Hazards Science Center, Golden, United States, Jason W Kean, U.S. Geological Survey, Geologic Hazards Science Center, Golden, United States, Luke McGuire, University of Arizona, Department of Geosciences, Tucson, United States and Dennis M Staley, U.S. Geological Survey, Landslide Hazards Program, Golden, CO, United States
Scales of Similarity and Disparity Between Fluvial Channels (355559)
Gareth G Roberts, Imperial College London, London, SW7, United Kingdom and Nicky White, University of Cambridge, Bullard Laboratories, Cambridge, United Kingdom
A new methodology for conducting a geoenvironmental assessment of undiscovered uranium resources in the United States (356365)
Tanya J Gallegos1, Johanna Blake2, Delbert Humberson3, Victoria Stengel4, Andrew Teeple4, Anne Scott5, Douglas B Yager6, Jose Vigil5, Katherine E Walton-Day7 and Kent Becher8, (1)U.S. Geological Survey, Geology, Energy, and Minerals (GEM) Science Center, Reston, VA, United States, (2)U.S. Geological Survey New Mexico Water Science Center, Albuquerque, United States, (3)U.S. Geological Survey, El Paso, TX, United States, (4)U.S. Geological Survey, Austin, TX, United States, (5)U.S. Geological Survey, Reston, VA, United States, (6)U.S. Geological Survey, Denver, CO, United States, (7)USGS Colorado Water Science Center, Denver, CO, United States, (8)U.S. Geological Survey, Fort Worth, TX, United States
The Cessation Threshold of Nonsuspended Sediment Transport Across Aeolian and Fluvial Environments (376628)
Thomas Pähtz, Zhejiang University, Hangzhou, China and Orencio Duran Vinent, Texas A&M University College Station, Ocean Engineering, College Station, TX, United States
Difference in Flooding Character and Magnitude between Frequent Floods and Extreme Events (386964)
Mark R Hansford, Colorado School of Mines, Golden, United States and Piret Plink-Bjorklund, Colorado School of Mines, Geology and Geological Engineering, Golden, CO, United States
Coupling Effects of Unsteady River Discharges and Wave Conditions on River Mouth Bar Morphodynamics (391788)
Weilun Gao1, Dongdong Shao1, Wang Zheng Bing2, William Nardin3, Wei Yang1, Tao Sun4 and Baoshan Cui1, (1)State Key Laboratory of Water Environment Simulation & School of Environment, Beijing Normal University, Beijing, China, (2)Delft University of Technology, Delft, Netherlands, (3)University of Maryland Center for Environmental Science Horn Point Laboratory, Horn Point Laboratory, Cambridge, United States, (4)Stanford University, Stanford, CA, United States
Exploring Hydrologic Controls on Patterns of Debris Flow Initiation in the Colorado Front Range during the September 2013 Flood Event (398430)
Sujana Timilsina, Colorado State University Fort Collins, Fort Collins, CO, United States, Jeffrey D Niemann, Colorado State University, Department of Civil and Environmental Engineering, Fort Collins, United States, Sara L Rathburn, Colorado State University, Geosciences, Fort Collins, United States and Francis K Rengers, University of Colorado, Boulder, United States
Lithologic and Climate Controls on Spatial Patterns in Chemical Weathering, Soil Production, and Erosion in New Zealand’s Tararua Range (402411)
Claire E Lukens, Victoria University of Wellington, Wellington, New Zealand and Kevin P Norton, Victoria University of Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand
Dating of West African planation surfaces thanks to paleomagnetic approaches (404897)
Philippe Freyssinet, Hervé Théveniaut and Robert Wyns, BRGM - French Geological Survey, Orleans, France
Implications of sediment capacitors as a source of stochastic transport (420453)
Tyler Doane, PhD, University of Arizona, Tucson, United States and David Jon Furbish, Vanderbilt University, Earth and Environmental Sciences, Nashville, United States
Runoff and erosion thresholds dictated by the balance between stochastic rainfall statistics and Critical Zone architecture (424399)
Matthew W Rossi, University of Colorado at Boulder, Earth Lab (CIRES), Boulder, CO, United States, Robert S Anderson, University of Colorado, Boulder, Department of Geological Sciences, Boulder, United States, Suzanne P Anderson, University of Colorado at Boulder, INSTAAR and Dept. of Geological Sciences, Boulder, United States and Gregory E Tucker, University of Colorado Boulder, CIRES and Department of Geological Sciences, Boulder, United States
Which catchment characteristics control the magnitude-frequency distribution of river discharge? (430873)
Renee van Dongen1, Dirk Scherler1,2, Eric Deal3, Claudio I Meier4, Luca Mao5 and Igor Lisac6, (1)GFZ German Research Centre for Geosciences, Earth Surface Geochemistry, Potsdam, Germany, (2)Free University of Berlin, Institute for Geological Sciences, Berlin, Germany, (3)ETH, Zürich, Switzerland, (4)University of Memphis, Department of Civil Engineering, Memphis, TN, United States, (5)University of Lincoln, School of Geography, Lincoln, United Kingdom, (6)GFZ German Research Centre for Geosciences, Earth Surface Process Modelling, Potsdam, Germany
Expression of rock strength in the morphology, bedrock exposure, and erosion rate of steep hillslopes in southern California, USA (438431)
Alexander Neely, Arizona Geological Survey, Tucson, AZ, United States, Roman A DiBiase, Pennsylvania State University Main Campus, Department of Geosciences, University Park, United States, Lee B Corbett, University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, United States and Paul R Bierman, University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, VT, United States
The formation and evolution of transverse ribs (443654)
Yinlue Wang and Marwan A Hassan, University of British Columbia, Vancouver, BC, Canada
Width variability controls formation and stability of step-pool sequences in steep streams (445268)
Matteo Saletti, University of British Columbia, Vancouver, BC, Canada and Marwan Hassan, Department of Geography, University of British Columbia, Vancouver, Canada
Event-driven controls on channel form in the Nepal Himalaya: Competition and cooperation between debris flows and glacial outburst floods (457251)
Maxwell Philip Dahlquist, University of Southern California, Los Angeles, CA, United States and A. Joshua West, University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
Evaluating Sediment Transport in an Ungauged Steep Mountain Stream During an Extreme Flood Event. (469021)
James Emerson Smith IV, Louisiana State University, Baton Rouge, LA, United States, Kory M Konsoer, LSU, Department of Geography and Anthropology, Baton Rouge, LA, United States and Carol M Wicks, Louisiana State University, Department of Geology & Geophysics, Baton Rouge, LA, United States

See more of: Earth and Planetary Surface Processes