Table 9. Estimates of eddy viscosity across the surf zone from 

 laboratory and field experiments (after Bowen and 

 Inman, 1974), 



Date 



Exp. 



^b 



hb 



ghb 



(m^?s) 



N 





No. 



(m) 



(m) 



(m/s) 





Inman, Talt and 















Nordstrom (1970) 















Scrlpps 



129 



83 



0.80 



2.7 



5.9 



0.064 





109 



80 



0.60 



2.4 



2.8 



0.037 





112 



68 



0.60 



2.4 



2.0 



0.030 





107 



70 



0.66 



2.5 



2.0 



0.027 



El Moreno 



55 



5.5 



0.45 



2.1 



.30 



0.065 





97 



4.7 



0.45 



2.1 



.12 



0.030 





95 



4.8 



0.40 



2.0 



.11 



0.026 





104 



4.8 



0.35 



1.8 



.12 



0.034 





97 



3.8 



0.30 



1.7 



.08 



0.039 



Harris et al. (1962) 















field 



t 



18 



1.4 



3.7 



1.1 



0.041 





2 



14 



1.1 



3.3 



0.24 



0.013 





3 



12 



0.9 



3.0 



0.26 



0.018 





4 



16 



1.2 



3.4 



0.42 



0.020 





5 



8 



0.6 



2.4 



0.28 



0.036 



laboratory 



- 



0.70 



0.068 



0.82 



0.0051 



0.022 





- 



0.80 



0.072 



0.85 



0.0054 



0.020 





- 



0.80 



0.072 



0.85 



0.0050 



0.018 





- 



0.50 



0.043 



0.66 



0.0051 



0.038 





- 



0.60 



0.056 



0.75 



0.0028 



0.016 





- 



0.50 



0.045 



0.67 



0.0023 



0.018 





- 



0.50 



0.041 



0.64 



0.0019 



0.015 





- 



0.30 



0.027 



0.52 



0.0022 



0.036 





- 



0.50 



0.043 



0.65 



0.0012 



0.010 





- 



0.35 



0.032 



0.57 



0.0007 



0.009 



Thornton (1970a) 















lab (Galvln, 1965) 

 field (Ingle, 1966) 



- 



0.52 



0.043 



0.65 



0.0029 



0.021 



- 



70 



1.5 



3.8 



1.4 



0.013 



Table 10. Comparison of four surf zone theories for mean eddy viscosity 

 across the surf zone (after Nielsen, 1977). 



Author 



Equation for Average 

 \i* Across Surf Zone 



Kn, Empirical 

 Constant 



Closure 

 Coefficient 



Relative 

 Scatter 



Remarks 



Longuet-Hlgglns 

 (1970). 



(0.4N)|x^|,^ 



0.007 



0.018 



0.5 



«L-H - "-^^ 



Inman, Talt, 

 and Nordstrom 

 (1970). 



(Kj)Hj^x^/T 



0.46 



0.46 



0.80 



K = Coeff. by Inman 



Jonsson, 

 Skovgaard, 

 and Jacobsen 

 (1974). 



(Kj)TpgH^cos^a^ 



0.017 



0.017 



1.12 



Kj = Coeff. by Jonsson 



Battjes (1975). 



(K^)(tanB-tanm)^' • 



8 



0.3-1.8 



1.8 



.-(«¥■ 



191 



