Geomorphology and Sedimentology of a Valley Fan, Southern Utah

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by K. J. Fischer, Water Engineering & Technology, Inc, Fort Collins, United States,
M. D. Harvey, Water Engineering & Technology, Inc, Fort Collins, United States,

Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H²AL)

Abstract: Sink Valley, located in semi-arid west-central Kane County, Utah, lies on an erosional surface of Cretaceous age Tropic Shale. The valley contains an example of a previously undocumented fan type, a valley fan. Morphologic, morphometric, and sedimentologic characteristics of the valley fill confirm the valley fan interpretation. Cross sections are convex in shape and the longitudinal profile is segmented. The relationship between fan area and source area for the Sink Valley fan and two tributary fans is intermediate between that of fans of the humid eastern U.S. and the more arid western U.S. Sediment transport is dominated by sheet flooding in the distal region of the fan, whereas mudflows and debris flows are significant depositional processes in the proximal and medial regions of the fan.

Subject Headings: Sediment | Light rail transit | Geomorphology | Sediment transport | Water flow | Solids flow | Debris | Landslides | Arid lands | Erosion | Utah | North America | United States

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