V (it/aee) 



Troncas Beach, Colif. 18 Oct, 1961 

 H^ . 4.5(t 

 Y = 0.78 

 \ • 4.5* . 

 T • IS.6 (te 

 r • O.IM 



0.02 . 



Figure 62. Thornton's longshore current profile theory versus field data 

 by Ingle, 1966 (after Horikawa, 1978). 



i 0.05 and rose rapidly nearshore and beyond the breakers as the current 



approached zero. 



The nonlinear longshore current profile model developed by Madsen, 

 Ostendorf, and Reynolds (1978) (see also Ostendorf and Madsen, 1979) used 

 the laboratory data of Gavlin and Eagleson (1965) to determine appropriate 

 values for bed friction and lateral mixing coefficients. An explicit 



empirical equation for f resulted with average f 



0.01 and decreased 



_ ^ cw ° cw - - — *- 



as V increased for the calibration runs on smooth concrete (e = 0.001 foot). 



The lateral eddy viscosity parameter, T was found to be 0.013. To test 



this model a parameter, 6, defined as 



176 



