Author(s): Andrew Tuthill; George Ashton; Phillip Hendershot; James Quadrini
Linked Author(s): Andrew M. Tuthill, George Ashton
Keywords: No keywords
Abstract: This paper describes a 1:30-scale physical model study with real ice to assess performance of a pier-type ice control structure (ICS) located at T6.75 in the lower Grasse River. The new type of ICS design consists of a row of transverse piers across the river channel and a second row of longitudinal piers parallel to the left bank. This L-shaped configuration doubles the total length of piers, reducing under-ice water velocity and providing relief flow around the jam that forms at the transverse piers. The model structure retained ice for a conservative range of ice and hydraulic conditions. Results of interest included non-uniform ice thickness distributions found upstream of the ICS and the development of preferential high-velocity flow channels beneath and through the ice accumulation. Near-field physical model results compare reasonably well to parallel DynaRICE simulations. The physical model study results, supported by the numerical simulations, increased confidence in the anticipated performance of this new type of ICS design. The findings presented in this paper represent work in progress only, as the final remedy at the Grasse River site has yet to be chosen.
Year: 2008