1. Associate Professor, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag 92019, Auckland, New Zealand. E-mail: s.coleman@auckland.ac.nz
2. Professor, Dept. of Engineering, Univ. of Aberdeen, Aberdeen AB24 3UE, U.K. E-mail: v.nikora@abdn.ac.uk
3. Professor, Mechanical and Environmental Engineering, Univ. of California at Santa Barbara, Santa Barbara, CA 93106. E-mail: mclean@engineering.ucsb.edu
4. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag 92019, Auckland, New Zealand. E-mail: tedschlicke@yahoo.com