1. Assoc. Prof. of Hydr. Engrg., Hydrodynamics Lab., Dept. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass.
2. Instr., Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
3. Asst. Prof., Dept. of Civ. Engrg., Oregon State Coll., Corvallis, Oreg.