1. Civil and Coastal Engineering, University of Florida, 365 Weil Hall, Gainesville, FL 32611, US.
2. Dept. of Astronomy, College of Arts and Sciences, University of Florida, 211 Bryant Space Center, Gainesville, FL 32611, US.
3. Civil & Coastal Engineering, University of Florida, 365 Weil Hall, Gainesville, FL 32611, US. (Corresponding author), e-mail: rcrowley@ufl.edu.