A detailed description is given of the results of laboratory experiments on bimodal velocity profile of
longshore currents over two mild-slope barred beaches.The objective is to examine the bimodal
longshore current velocity profile for purely wave-driven currents,with emphasis on the second peak
and ratio of two peaks.The research focusis on the locations,values and ratios of two velocity peaks for
the casesofmildslopebeaches.Thedependenceofitsbimodalfeatureonwaveheight,waveperiodand
beach slope on the longshore currents are dis cussed.The 2-D model based on vertically integrated
equations(externalmode) of Near shore POM was performed to compute the measured velocity profile.
The depth-varying wave-in duced residual momentum,the surf acerollers,and the late ralmixing the
bottom frictionarec on sidered,andtheeffectsoflateralmixing,surfacerollersandbottomfrictionon
numerical modelarediscussed.