surface elevation with measured values. The file is also used by the program 

 HPRN to print graphs for comparing computed and measured water surface 

 elevations . 



Auxiliary Programs 



125. Several optional special-purpose programs have been developed for 

 characterizing and visualizing the inlet hydrodynamics generated by DYNLETl. 

 Some of the programs compare field measurements with computed values. The 

 auxiliary programs must, therefore, also have input and output files. There 

 are two sources for the input files: files containing field data and files 

 generated by DYNLETl to provide computed values. Care must be exercised that 

 the number of time steps and the number and location of the nodes in the 

 generated output files match the times and locations in the field data files. 

 Descriptions of the auxiliary programs and their input-output files are given 

 next (see also Figure 6). 



CHANNEL and CHANPRN 



126. The program CHANNEL determines point-by-point velocities across 

 the channel and displays cross -section geometry and velocities on the 

 monitor. CHANPRN functions similarly by sending user-specified plots to the 

 printer. 



Input File: CHANNEL.DAT 

 Output File: CHANNEL. OUT 

 OPLOT and OPRN 



127. The program QPLOT plots, on the monitor, the computed discharge as 

 a function of time at selected nodes prescribed in PARAM.DAT. If a file named 

 QOBSD.DAT, containing measured values of discharge is available, the program 

 graphs the measured values on the same plot. QPRN functions similarly by 

 sending user-specified plots to a printer. 



Input Files: QPLOT.DAT; QOBSD.DAT (measured flow rates) 

 VPAS and VPRN 



128. The program VPAS computes velocities, as a function of time across 

 the channel cross section, at designated points specified in file PARAM.DAT 

 and plots them on the monitor. If a file named VOBSD.DAT containing measured 

 values of velocity is available, the program graphs the measured values on the 



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