The analytical forms of the time-averaged bottom shear stress are developed in this paper. The effects of the angle between the direction of wave propagation and the mean currents, and a large angle of wave incidence are included in the study. Two different friction models were obtained based on the relative magnitudes of wave orbital velocity and that of mean currents. These two friction models are applied to longshore currents generated by obliquely incident waves....
Liu, Philip L., and Robert A. Dalrymple. 1978. "Bottom frictional stresses and longshore currents due to waves with large angles of incidence." Journal of Marine Research 36, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1434