1. Graduate Research Assistant, Stanley Hydraulics Laboratory, Dept. of Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242.
2. Associate Professor, Stanley Hydraulics Laboratory, Dept. of Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242 (corresponding author).
3. Adjunct Professor and Research Engineer, Stanley Hydraulics Laboratory, Dept. of Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242.
4. Assistant Professor, Dept. of Ocean Science and Engineering, Zhejiang Univ., Zhejiang, Hangzhou 310058, China.