1. Department of Civil and Environmental EngineeringUniversity of New Hampshire Durham NH USA
2. Earth Systems Research Center, Institute for the Study of Earth, Oceans, and SpaceUniversity of New Hampshire Durham NH USA
3. Department of Agricultural and Biosystems EngineeringNorth Dakota State University Fargo ND USA
4. Now at Department of Electrical and Computer EngineeringUniversity of Massachusetts Amherst MA USA