rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Performance of geologic material under hydraulic stress
  name:
    name part: Cato, Kerry Don.
    role:
      role term: creator
  name:
    name part: Giardino, John R.
    role:
      role term: degree committee member.
  name:
    name part: James, Wesley P.
    role:
      role term: degree committee member.
  name:
    name part: Mathewson, Christopher C.
    role:
      role term: degree supervisor.
  name:
    name part: Tilford, Norman R.
    role:
      role term: degree committee member.
  name:
    name part: Waters, Michael R.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1991
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiv, 272 leaves : illustrations (some color), maps ; 29 cm
  abstract: Greater than 20,000 small and medium sized dams use excavated emergency spillway channels to handle flood flows. More than 95% of these dams have never experienced a spillway flow. However, because a great number are less than 15 years old, the probability of spillway flow increases each year. Little information concerning the performance of rock material subjected to hydraulic stresses exists. In this study twenty-seven spillways with different geologic material and erosion damage were analyzed to identify important variables controlling the erosion process. Field observations indicate geology is the major control on erosion and can be defined by the following geologic erosion equation: Gr = f(L, SP, G, ST, MP) where Gr = Geologic Resistance to hydraulic erosion, L = Lithology, SP = rock Substance Properties, G = Genesis of material, ST = Structure and Tectonic history, MP = rock Mass Properties. These values can be further used in a material performance classification to delineate stable non-erosive flow conditions. In this classification system material is divided into four classes from the most resistant AAAA to the least resistant A. Limits for each of the geologic erosion equation factors are established for each class. Clastic sedimentary rocks were found to be the most variable in erosion resistance and the most severe erosion events observed occurred in this rock type. Density, cementation, and strength characteristics determine the resistance of soils and severely weathered rock; conversely, other substance properties such as permeability were not found to be as important. Rock genesis determines both the lateral and vertical continuity of rock units as well as their erodibility. For example, it determines if an erosion resistant sandstone unit disappears along the length of a spillway channel due to a facies change. It also determines if an erodible unit is interbedded with non-erodible units thereby creating a potentially unstable situation. The deformat…
  note: "Major subject: Geology."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. Texas A & M University 1991
  note: Includes bibliographical references.
  subject:
    topic: Dams
    topic: Design and construction
  subject:
    topic: Engineering geology
  subject:
    topic: Rocks
    topic: Erosion
  subject:
    topic: Major geology
  classification: QE581 .C376 1991
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-1204054
  identifier: http://gateway.proquest.com/openurl
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-1204054
  related item:
    location:
      url: http://gateway.proquest.com/openurl
  record info:
    record content source: TXA
    record creation date: 911206
    record change date: 20220103134842.0
    record identifier: in00001049905
    language of cataloging:
      language term: eng