Toe Scour and Bank Protection Using Launchable Stone.

Abstract

An empirical method for scour depth estimation is developed based on radius/width and aspect ratio. The thickness of the before-launch section controls the rate at which rock is released and should be 2.5 to 4.0 times the thickness of the bank protection revetment Tau for gradual scour and 2.5 to 3.0 Tau for rapid scour found in impinged flow environments. Riprap size for gradual scour is the same for both launched riprap and riprap placed by standard construction methods. Stone volume requirements are presented as a function of scour depth and whether the launch section is placed in the dry or underwater. Gradations having D85/D15 > 2 are recommended for launched riprap sections to prevent leaching of bank material through the launched riprap. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1995
Accession Number
ADA302130

Entities

People

  • Douglas M. White
  • Stephen T. Maynord

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Army Corps Of Engineers
  • Aspect Ratio
  • Construction
  • Data Analysis
  • Embankments
  • Engineers
  • Environment
  • Flood Control
  • Leaching
  • Materials
  • Measurement
  • Mississippi River
  • Missouri River
  • Revetments
  • Standards
  • Test Facilities
  • Thickness

Readers

  • Geotechnical Engineering.
  • Missile Defense Systems.
  • Riverine Ecology