Riprap Sizing-Four Methods

by Andrew J. Reese, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development


A comparison summary is provided for sizing of riprap by four methods: Isbash, Froude, Tractive Force - Logarithmic Velocity Profile (TFL), and Tractive Force - Power Velocity Profile (TFP). Discussion is limited to that of riprap placed on the bed of a uniform channel. Thus, the complexities of side-slope placement, infiltration, slope stability, filter type, toe scour, bend shear, etc. , are avoided. The basic forces causing movement are pressure and drag. Each of these methods represents the basic forces by some function of either point or mean channel velocity. The fluctuation level in these basic forces is taken into account by an empirically determined constant.

Subject Headings: Riprap | Velocity profile | Channels (waterway) | Hydraulic design | Comparative studies | Froude number | Infiltration | Slope stability

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