VI-234 



(2) There is need to develop predictive models for gross 

 spreading of patches and plumes in the ocean from the 

 combined effects of eddy diffusion (both horizontal and 

 vertical) and shear in the mean velocity field. The 

 research in item 1 above will provide a basis for this 

 development and will allow a better interpretation of 

 previously reported values of gross dispersion coefficients. 



(3) It is recommended that systematic tracer experiments 

 be carried out in subsurface waters in order to have more 

 reliable information on the dispersion or rate of speed of 

 a patch or plume. These experiments should include the 

 use of artificial tracers, such as fluorescent dye, and 

 studies of existing waste fields which occur at subsurface 

 depths. 



Physical Processes in Coastal Areas 



(1) To achieve a proper understanding of coastal circulation 

 on all scales, a program of collection of oceanographic and 

 meteorological data is recommended. The observations should 

 be made over a long enough period of time to reveal all 

 periodicities up to and including annual. Although such a 

 program could be carried out by multi-ship operations, 

 moored arrays of instruments capable of sampling the entire 

 water column would probably be better. Such a program should 



