Prediction of Rip Currents
Principal Investigator:Robert A. Dalrymple
Start/End Year:2005 to 2008
Institution:Johns Hopkins University
OBJECTIVES: To develop a simple methodology for prediction of rip currents, based on theories, numerical modeling, and field observation. This methodology would be used to predict hazardous conditions at the shoreline.
METHODOLOGY: Review and verify existing theories using a numerical Boussinesq wave model. Install a beach monitoring system at Ocean City to observe rip current conditions. Work with lifeguards to gather data and test the methodology.
RATIONALE: Rip currents are one of the most deadly of natural hazards and account for most of the rescues by lifeguards. By providing a simple theory-based methodology to predict the likelihood of these currents, people can be warned and lives saved.
Dalrymple, Robert A., Jamie H. MacMahan, Ad J.H.M. Reniers, and Varjola Nelko.. 2011. Rip currents. Annual Review of Fluid Mechanics 43:551-581. doi:10.1146/annurev-ﬂuid-122109-160733. UM-SG-RS-2011-09.
Varjola, N; Dalrymple, RA. 2011. Rip current prediction at Ocean City, Maryland. Leatherman, S; Fletemeyer, J, eds. Rip Currents: Beach Safety, Physical Oceanography, and Wave Modeling. CRC Press: Taylor & Francis Group. Chapter 3:45-57. UM-SG-RS-2011-08.