River Bed Deformations Near Banks And
Hydraulic Structures Due To River Flow
Author(s)
A. E. Schodro
Abstract
Estimating local scouring associated with structures placed in rivers and streams,
e.g. bridge piers, bridge abutments, spur dykes etc., is an important facet of their
design. However, due to the non-uniformity of alluvial channel bed and bank
materials and the complex nature of the fluid–sediment–structure interactions
and sediment transport processes, the calculated maximum scour depth for a
given flow condition is normally regarded as being approximate, at best. This
study investigates the nature of local scouring formed by vortices that are
generated behind partially submerged river bed features having slanted ridges,
and behind the ridges of scour holes. Modified theoretical relations developed
for local scouring are compared with the results of experiments performed in
laboratory channels having both rigid and moveable (test-bed) sections. At
selected intermediate stages of the bed-scouring process, maximum velocities
and turbulence intensities were measured at the bottom of developing scour
holes. Two mathematical models for forecasting rearrangement of the river bed
in a zone of local deformations are used. One considers scouring in beds
composed of relatively homogeneous small sand particles, while the other is
appropriate for channel beds comprised of non-homogeneous materials.
Keywords: nonstationary local scour, concentrated scour, bridge piers, spur
dyke, submerged river-bed installations, river-bed regulation scheme,
mathematical modeling.
Keywords
nonstationary local scour, concentrated scour, bridge piers, spur
dyke, submerged river-bed installations, river-bed regulation scheme,
mathematical modeling.
Related Book
Other papers in this volume
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