Stone Stability under Stationary Nonuniform Flows

Stone Stability under Stationary Nonuniform Flows

Steenstra, Remco (flux.partners)
Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk)
Paarlberg, Andries (HKV Consultants)
Smale, Alfons (Deltares)
Huthoff, Fredrik (HKV Consultants)
Uijttewaal, W.S.J. (TU Delft Hydraulic Engineering)

Hydraulic Engineering

2016

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.

Stone stability
Riprap
Turbulence
Acceleration

http://resolver.tudelft.nl/uuid:42319920-07df-4554-a08d-d61fd4ac5fce

https://doi.org/10.1061/(ASCE)HY.1943-7900.0001202

0733-9429

Journal of Hydraulic Engineering (Reston), 142 (12)

Institutional Repository

journal article

© 2016 Remco Steenstra, Bas Hofland, Andries Paarlberg, Alfons Smale, Fredrik Huthoff, W.S.J. Uijttewaal