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Alluvial Fan Flooding (1996) / Chapter Skim
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D Glossary and List of Acronyms
Pages 167-172

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From page 167...
... Bajada A broad, continuous alluvial slope or gently inclined detrital surface, extending along and from the base of a mountain range out into and around an inland basin, formed by the lateral coalescence of a series of separate but confluent alluvial fans, and having an undulating character due to the convexities of the component fans; it occurs most commonly in semiarid and desert regions, as in the southwestern United States. A bajada is a surface of deposition, as contrasted 167
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From page 168...
... Debris flow A mass movement involving rapid flowage of debris of various kinds under various conditions; specifically, a high-density mudflow containing abundant coarse-grained materials and resulting almost invariably from an unusually heavy rain. Delta The low, nearly flat, alluvial tract of land deposited at or near the mouth of a river, commonly forming a triangular or fan-shaped plain of considerable area enclosed and crossed by many distributaries of the main river.
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From page 169...
... Pediment A broad, flat or gently sloping, rock-floored erosion surface or plain of low relief, typically developed by subaerial agents (including running water) in an arid or semiarid region at the base of an abrupt and receding mountain front or plateau escarpment, and underlain by bedrock (occasionally by older alluvial deposits)
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From page 170...
... Schist A strongly foliated crystalline rock formed by dynamic metamorphism which can be readily split into thin flakes or slabs due to the well-developed parallelism of more than 50 percent of the minerals present. Scour (a)
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From page 171...
... , viscous, downslope flow of waterlogged soil and other unsorted and saturated surf~cial material. Stochastic hydrology That branch of hydrology involving the manipulation of statistical characteristics of hydrologic variables with the aim of solving hydrologic problems, using the stochastic properties of the events.
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From page 172...
... 172 BEE Base Flood Elevation List of Acronyms CLOMR Conditional Letter of Map Revision FEMA Federal Emergency Management Agency FIRM Flood Insurance Rate Map HEC Hydrologic Engineering Center LOMA Letter of Map Amendment LOMR Letter of Map Revision NF1P National Flood Insurance Program NRC National Research Council NRC S Natural Resources Conservation Service SFHA Special Flood Hazard Area U
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Key Terms

  • alluvial fan
  • mountain range
  • gently sloping
  • calcium carbonate
  • alluvial deposits

  • soil material
  • alluvial fans
  • dynamic metamorphism
  • movement involving
  • ground moraine

  • geologic concepts
  • drainage basin
  • poorly cemented
  • aligned roughly
  • dry bed

  • similar processes
  • clayey soil
  • minor amount
  • uneven glacial
  • original relief

  • southwestern united
  • clastic sediments
  • usually occur
  • cemented sandstone
  • larger rock

  • detrital surface
  • arid region
  • slightly plastic
  • mass movement
  • relatively undissected


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