- 145 



9. Arithmetic Development of the Curvature Terms 



For investigative purposes, it was attempted to create the 

 water surface curvature terms as described earlier. Typically, this 

 was only done along the y-axis using the dP2 and dP4 signals since 



0.00 



10,00 



2b. 00 



30.00 



40.00 sb.oo 



sb.oo 



70.00 



TIME (seconds ) 



FIGURE VI-16: Typical portion of time series of dP2 and dP4 

 "slope" signals with the associated dP4-dP2 "curvature" 

 signals. Signal of dP4 is dashed line. 



the digitized x-axis signal of dPl was erratic. The terms were 

 arithmetically created in the time domain through the difference of 

 the dP2 and dP4 signals after adjacent values in each channel's 

 record were averaged and the number of points in the 17 minute long 



