The modelling of rip channel in creation of rip currents

Abstract

Rip currents are generally strong shore- normal flows that originate within the surf zone and are directed seaward through the breakers. Rip currents typically reach speeds up to 1 m/s and some have been reported 2 m/s. These currents from areas near the coastline begin and develop in surf zone. Many factors could cause this current that could mention a perpendicular rip channel the shore. In this study, the rip channel was modelled by Mike 21 software, BW model and the effects of rip channel on creation of rip currents were studied. At first a shore with constant slope was modelling and then, creating rip channel at centre of the model, modelling take place. Crating rip channels, a powerful returning current toward offshore was created at the middle of shore. At the point (600 m, 850 m) return current velocity have a maximum level (1/4 m/s velocity) which changes at difference times showing that rip current is a instantaneous flow. © Indian Society for Education and Environment (iSee).