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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Hydrodynamics of Knickpoint Erosion
By
Headward erosion of knickpoints in stream channels
and spillways represents a risk to the safety of dams and
other riverine structures. Knickpoint erosion is often initiated
at a geometric anomaly in the channel profile, be it
man-made or natural. Rock strength properties, stratigraphic
relationships and structure are all controlling geological
factors in the phenomena of knickpoint erosion.
Hydrodynamic
factors are controlled by the relationship
between the depth of water and height of fall and whether
the flow system is vented or not. At high flow volumes
compared to the height of the fall, the knickpoint acts as a
minor irregularity on the channel floor and retreat is
minimized. However, at low flows, unvented conditions can
develop over the knickpoint and significant amounts of
erosion and headward cutting are possible. A knowledge of
the phenomena of knickpoint erosion is critical to the safe
design and operation of riverine structures.
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