Design guidance for low-water crossings in areas of extreme bed mobility, Edwards Plateau, Texas.

Details

• Alternative Title:
  Guidance for design in areas of extreme bed-load mobility, Edwards Plateau, Texas.
• Creators:
  Thompson, David B.
• Corporate Creators:
  Texas Tech University. College of Engineering ; Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Fords (Hydrology)
  • Bed load
• Publication/ Report Number:
  0-4695-4
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Texas Department of Transportation. Research and Technology Implementation Office
• Abstract:
  The purpose of this report is to present results from a combination of field and laboratory investigations of mobility ; of gravel to cobble sized materials in Texas streams on the Edwards Plateau. TxDOT uses low-water crossings for ; many of the roadways in the region, particularly where the streams are ephemeral. When the streambed mobilizes, ; instances of roadway loss of service, either by deposition of large amounts of bed materials or by structural failure ; associated with streambed mobilization are relatively common. The objectives of the project were to determine the ; mechanics of streambed mobilization and develop design guidelines (approaches) to mitigate damage associated ; with streambed mobilization events. Numerical models were developed and a GIS approach was used to ; demonstrate how area subject to streambed mobilization can be identified through application of these tools. ; Physical models were used to demonstrate the mechanics of streambed mobilization and test current design ; solutions. The physical model identified the mechanics for culvert “self-clearing” and that a porous roadbed results ; in changes to the flow dynamics that affect bedload deposition in the low-water crossing area. An offset threeculvert ; design was identified by TxDOT engineers as an alternative to the more-common box culvert.
  More +
• Format:
  PDF
• Funding:
  0-4695-01-2
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16827/dot_16827_DS1.pdf
• File Type:
  [PDF - 4.75 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:9c9d756020cd51f3a3f0a775581a0d081d3eabd3a692999112ee6e3d4abf630b5e7d11e7a3c7e192b900ba94c2e91770114199b43d12d6e998b39de3a6d6309c