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    Geomorphology and hydrology of an alluvial fan flood on Tiger Wash, Maicopa and La Paz Counties, west-central Arizona

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    Author
    Pearthree, P.A.
    Klawon, J.E.
    Lehman, T.W.
    Issue Date
    2004-05-01
    Keywords
    Arizona Geological Survey Open File Reports
    La Paz County
    Arizona
    Maricopa County
    Tiger Wash
    floodplain
    distributary fluvial systems
    hazards
    hydrology
    flood
    alluvial fan
    geomorphology
    Geology
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    Citation
    Pearthree, P.A., Klawon, J.E., and Lehman, T.W., 2004, Geomorphology and hydrology of an alluvial fan flood on Tiger Wash, Maicopa and La Paz Counties, west-central Arizona. Arizona Geological Survey Open File Report, OFR-04-02, 2 map sheets, map scale 1:24,000, 40 p.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    Management of flood hazards on alluvial piedmonts in the southwestern United States is increasingly important because urban development is rapidly expanding into these areas. Flows are very infrequent in most desert fluvial systems, yet these events can be extreme because watersheds generate large amounts of runoff per unit area during intense precipitation events associated with convective thunderstorms or incursions of dissipating tropical storms. Distributary (downstream-branching) fluvial systems that are common on desert piedmonts present special challenges because of uncertainties about flow distribution during floods. Portions of many distributary channel networks are incised into Pleistocene surficial deposits. In these areas, channel positions are relatively stable and inundation in floods is limited in extent. In active alluvial fan areas, however, topographic relief associated with channels is minimal and areas between channels are covered with Holocene deposits indicative of fairly recent fluvial activity (Pearthree, 1989; Baker and others, 1990; Pearthree and others, 1992; Field and Pearthree; 1997). These latter systems are of particular concern for floodplain management because of complex flow patterns, local high velocity flow, widespread sheet flooding and the potential for changes in channel position during large floods (NRC, 1996). Hydrologic and hydraulic models commonly used to delineate floodplain areas are not adequate in the complex distributary environment, and newer, more sophisticated 2-dimensional flow models require validation against real flood flows (Pelletier et al., in review). Flood inundation on active alluvial fans has rarely been documented in detail (Vincent, 2000), however, in part because of the complexity of flow and in part because of the requirement that the flood be recognized soon after its occurrence in order to document the details of flow.
    URI
    http://hdl.handle.net/10150/630647
    Additional Links
    https://library.azgs.arizona.edu/item/AOFR-1552427386797-910
    Language
    en
    Series/Report no.
    OFR-04-02
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    33.9004
    South Bounding Coordinate
    33.6653
    West Bounding Coordinate
    -113.387
    East Bounding Coordinate
    -113.058
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