Stone stability under stationary nonuniform flows

Remco Steenstra, Bas Hofland*, Alfons Smale, Andries Paarlberg, Fredrik Huthoff, Wim Uijttewaal

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A stability parameter for rock in bed protections under nonuniform stationary flow is derived. The influence of the mean flow velocity, turbulence, and mean acceleration of the flow are included explicitly in the parameter. The relatively new notion of explicitly incorporating the mean acceleration of the flow significantly improves the description of stone stability. The new stability parameter can be used in the design of granular bed protections using a numerical model for a large variety of flows. The coefficients in the stability parameter are determined by regarding the measured low-mobility entrainment rate of rock as a function of the stability parameter. Measurements of flow characteristics and stone entrainment of four different previous studies and many configurations (uniform flow, expansion, contraction, and sill) are used. These configurations have different relative contributions of mean flow, turbulence, and stationary acceleration. The coefficients in the parameter are fit to all data to obtain a formulation that is applicable to many configurations with nonuniform flow.

Original languageEnglish
Article number04016061
JournalJournal of hydraulic engineering
Volume142
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Keywords

  • Acceleration
  • Riprap
  • Stone stability
  • Turbulence

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