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Urn Sin at, cos oti . cm /sec 



Figure 56. The empirical longshore current at midsurf position as deduced 

 by Komar and Inman (1970) based upon sand transport studies 

 (after Komar and Inman, 1970). 



V = the mean or average velocity across the surf zone. Even here 

 the meaning is somewhat ambiguous since the mean could be 

 determined by including that portion seaward of the breaker 

 line (also a local value when profile is given) 



and their dimensionless counterparts (using V). It is assumed here (follow- 

 ing Komar, 1969, 1975b, 1976b) that all field data, except as noted, were 

 for the midsurf position, x;^. 



A comprehensive discussion and detailed analysis of all available lab- 

 oratory and field data led Komar and Inman (1970), ^^ and Komar (1975b, 1976b) 



^'^KOMAR, P.D., and INMAN, D.L., "Longshore Sand Transport on Beaches," Journal 

 of Geophysical Research, Vol. 75, No. 30, 1970, pp. 5914-5927 (not in bib- 

 liography) . 



169 



