1. HR Wallingford Ltd., U.K.; presently, WorleyParsons, P.O. Box 44169, Abu Dhabi, U.A.E. (corresponding author).
2. Technical Univ. of Denmark, MEK, Coastal, Maritime and Structural Engineering Section (formerly ISVA), Building 403, DK-2800 Lyngby, Denmark.
3. INTEC Asia Pacific, Changkat Raja Chulan, 50200 Kuala Lumpur, Malaysia.
4. Dept. of Engineering, Univ. of Cambridge, Trumpington St., Cambridge CB2 1PZ, U.K.
5. INPG-UJF-CNRS, BP 53, 38041 Grenoble Cedex 9, France.