1. Dept. of Water Resources Engineering, Lund Univ., Box 118, S-221 00 Lund, Sweden (corresponding author). E-mail: bencamenen@yahoo.com
2. Senior Coastal Engineer, Han-Padron Associates, 22 Cortlandt St., New York, NY 10007.
3. Dept. of Water Resources Engineering, Lund Univ., Box 118, S-221 00 Lund, Sweden.