Stratigraphy of Alluvial Fan Flood Depositsby Jeffrey R. Keaton, Texas A&M Univ, United States,
Christopher C. Mathewson, Texas A&M Univ, United States,
Abstract: The purpose of this paper is to describe an engineering geologic technique for assessing the frequency and magnitude of sedimentation events on alluvial fans. The technique is based on the stratigraphy and geomorphology of alluvial fan deposits. The technique has been applied to alluvial-fan deposits in Davis County, Utah. The primary components of the technique consist of 1) identifying the size and number of historic sedimentation events on specific alluvial fans, 2) estimating the total volume of the alluvial-fan deposits which are younger than some relatively recent datum, 3) differentiating the prehistoric deposits on the basis of stratigraphy and geomorphology, 4) computing the frequency and magnitude of individual prehistoric events large enough to leave discernible deposits, and 5) computing exceedance probabilities for actuarial purposes, engineering design, and investment decisions.
Subject Headings: Alluvial channels | Stratigraphy | Sediment | Floods | Transportation engineering | Probability | Flood frequency | Geomorphology | Utah | North America | United States
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