1. Department of Civil engineering, Dalhousie University, Halifax, NS B3J 2X4, Canada.
2. Department of Fisheries and Oceans Canada, P.O. Box 5030, Moncton, NB E1C 9B6, Canada.
3. Department of Mathematics and Statistics Université de Moncton, Moncton, NB E1A 3E9, Canada.
4. Department of Civil engineering, Université de Moncton, Moncton, NB E1A 3E9, Canada.