1. Coast. Res. Engr., Inst. of Hydrodyn. and Water Resour., Tech. Univ. of Denmark, DK-2800 Lyngby, Denmark; currently, Danish Hydr. Inst., Agern Alle 5, DK-2970 Hørsholm, Denmark. E-mail: jhj@dhi.dk
2. Prof., Inst. of Hydrodyn. and Water Resour., Tech. Univ. of Denmark, DK-2800 Lyngby, Denmark. E-mail: fredsoe@isva.dtu.dk