CALL FOR PROPOSALS:

ORGANIZERS

  • Harvey Thorleifson, Chair
    Minnesota Geological Survey
  • Carrie Jennings, Vice Chair
    Minnesota Geological Survey
  • David Bush, Technical Program Chair
    University of West Georgia
  • Jim Miller, Field Trip Chair
    University of Minnesota Duluth
  • Curtis M. Hudak, Sponsorship Chair
    Foth Infrastructure & Environment, LLC

 

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Paper No. 1
Presentation Time: 9:00 AM

SEDIMENT INTERACTIONS IN AXIAL AND TRANSVERSE ALLUVIAL SYSTEMS


KIM, Wonsuck, Department of Geological Sciences, University of Texas at Austin, 1 University Station C9000, Austin, TX 78712-025, CONNELL, Sean D., New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, 2808 Central Ave. SE, Albuquerque, NM 87106, SMITH, Gary A., Earth and Planetary Sciences, University of New Mexico, MSC03 2040, Albuquerque, NM 87131, PAOLA, Chris, Earth Sciences, Univ of Minnesota, St. Anthony Falls Laboratory, Mississippi River at 3rd Ave SE, Minneapolis, MN 55414 and STEEL, Elisabeth, Department of Earth Science, University of California, Santa Barbara, Santa Barbara, CA 93106, delta@jsg.utexas.edu

We present a geometric, sediment mass-balance model for the interaction of axial and transverse alluvial systems in a subsiding basin. Comparing the model result with a flume experiment that employed a half-graben tectonic geometry with axial and transverse sediment sources allows quantification of axial-transverse erosional sediment mixing. In the experiment, lateral erosion rate at the axial-transverse boundaries is scaled with sediment supplies delivered by transverse drainages but with neither water (and sediment) discharge from the axial channel nor tectonic tilting rate. The model uses an empirical lateral-erosion rate to show how the sediment supply partitioned between hanging wall and footwall drainages controls the width and the location of the axial-channel belt. Comparing the modeling results with field cases demonstrates that transverse sediment fluxes could slow the axial-channel migration or even reverse the movement against the tectonic forcing.

Session No. 184

T76. A Multidisciplinary Approach to Understanding the Dynamics of Sinuous Channel Evolution in Different Environments (Posters)
Tuesday, 11 October 2011: 9:00 AM-6:00 PM
Hall C (Minneapolis Convention Center)
Geological Society of America Abstracts with Programs. Vol. 43, No. 5, p.453
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