ABSTRACT 



Four numerical simulation methods were examined in an effort 

 to predict the variation in positoin of the Gulf Stream's northern 

 edge. The first two methods, application of river meander the- 

 ory to Gulf Stream meanders and relating the Gulf Stream to 

 paths of constant potential vorticity in barotropic flow, proved 

 unsatisfactory for Gulf Stream prediction. The second two meth- 

 ods, prediction by harmonic analysis and a simple barotropic 

 dynamic model, appear adequate for short-term (less than 10 

 days) prediction. 



WILLIAM H. GEMMILL 



Applications Research Division 



Ocean Science Department 



