Table 25-1. Estimates of Turbulent Energy 



Dissipation Rates in the Experimental Microcosms 



and in Some Natural Marine Waters 



Microcosms with one paddle 

 Microcosms with half paddle 

 Microcosms with no paddle 



Narragansett Bay, West Passage 

 measured at different times 



Narragansett Bay, West Passage 

 estimated from tidal currents, 

 (Levineand Kenyon, 1975) 0.21 



Irish Sea, estimated from tidal 



currents (Taylor, 1919) 0.08 



N.W. Pacific coastal water, U.S.A. 

 surface 30m, calcualted from 

 changes in microstructure 

 (P.W. Nasmyth in Gregg 1973) 0.02 



Open sea, surface mixed 



layer (50 m) (Gregg 1973) 0.002 



2 1 

 Functional Regressions for F, cm sec 



West Passage F = 0.007 Cl .89 (6) 



Microcosms with one paddle F = 0.108 Cl .38 



with half paddle F = 0.01 3 Cl .73 



The simpler measurements of horizontal dye patch dispersion suggested that 

 while the one paddle microcosms were considerably more turbulent than those 

 with half a paddle, both were more rapidly mixed than the bay (Table 25-2). 

 This same trend with respect to differences between the whole paddle and half 

 paddle microcosms was also shown by the weight loss of gypsum blocks and 

 the gas exchange measurements (Table 25-2). However, both of these 

 parameters indicated substantially higher mixing rates in the bay than in any of 



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