1. Associate Professor, Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Univ. of Iowa, Stanley Hydraulics Laboratory, Iowa City, IA 52242 (corresponding author).
2. Graduate Research Assistant, Civil and Environmental Engineering Dept., IIHR-Hydroscience and Engineering, Univ. of Iowa, Stanley Hydraulics Laboratory, Iowa City, IA 52242.
3. Associate Professor, Dept. of Civil Engineering and Mechanics, Univ. of Wisconsin, Milwaukee, WI 53201.