1. Senior Research Engineer, Energy-Water-Ecological Engineering, Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6036 (corresponding author).
2. Associate Professor, Civil & Environmental Engineering Dept., IIHR-Hydroscience and Engineering, Univ. of Iowa Stanley Hydraulics Laboratory, Iowa City, IA 52242.
3. Professor, Dept. of Geography, Univ. of Buffalo, SUNY, 105 Wilkeson Quad, Buffalo, NY 14261.
4. Prof., Dept. of Civil and Environmental Engineering, Baker Environmental Hydraulics Laboratory,Virginia Tech, Blacksburg, VA.