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SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers

SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers,10.1061/(ASCE)1090-0241(1999)125:4(237),Journal of Geotechnical and Geoenvironmenta

SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers   (Citations: 40)
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A new method called SRICOS is proposed to predict the scour depth z versus time t around a cylindrical bridge pier of diameter D founded in clay. The steps involved are: (1) taking samples at the bridge pier site; (2) testing them in an erosion function apparatus to obtain the scour rate zversus the hydraulic shear stress applied t; (3) predicting the maximum shear stress tmax, which will be induced around the pier by the water flowing at vo before the scour hole starts to develop; (4) using the measured zversus t curve to obtain the initial scour rate zi corresponding to tmax; (5) predicting the maximum depth of scour zmax for the pier; (6) using zi and zmax to develop the hyperbolic function describing the scour depth z versus time t curve; and (7) reading the z versus t curve at a time corresponding to the duration of the flood to find the scour depth that will develop around that pier. A new apparatus is developed to measure the zversus t curve of step 2, a series of advanced numerical simulations are performed to develop an equation for the tmax value of step 3, and a series of flume tests are performed to develop an equation for the zmax value of step 5. The method is evaluated by comparing predictions and measurements in 42 flume experiments.
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