| Limestone riprap, at a site consisting of a series of dykes in Northern Canada, is degrading and much of it will require replacement in the near future. The challenge is determining the capacity of this riprap to protect against the environmental demands, and to manage cost effective riprap replacement programs.; During field studies in 2001 and 2002, an average of 14 "large" riprap (larger than 0.20 m on two sides) per metre were measured at selected sites, with an average nominal diameter of 0.33 metres. Compared to similar data collected in 1998, the number of "large" rocks increased by as much as 2 to 3 rocks per square metre and the size of these rocks decreased by as much as 0.1 metres. One possible theory is that many "large" rocks are breaking into two or more "large" rocks. (Abstract shortened by UMI.)... |
