Experimental studies were conduoted in a straight reach of rectangular
channel to determ1ne the dynamic equilibrium depth of scour associated with
submerged constrictions or groins. Tests were carried out with various groin
geometries in both rigid- and movable-bed models. Velocity traverses were
made over the groins and in the constricted region to establish the relationship
between the ratio of discharge through the constriction to the total
discharge and the relative groin submergence and geometry. Measurements of
the eroded bed profile in the constricted region indicated that the equilibrium relative depth of scour was related primarily to the discharge ratio
and the constriction ratio. All groin geometries tested demonstrated the
capability of providing relatively large scour depths at low stages, and less
scour depths at high stages for which a larger portion of the total discharge
passed over the groins. Reasonable agreement with predicted relative scour
depths was noted for relatively large sediment transport rates.
St. Paul District, Corps of Engineers, Department of the Army
Dhamotharan, S.; Dahlin, W. Q.; Wetzel, J..
Model Studies of the Bed Regime of Alluvial Channels as Influenced by Submerged Groins.
St. Anthony Falls Hydraulic Laboratory.
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