SHORM 



294. The input file SHORM.DAT holds the position of the measured 

 shoreline to be reproduced in the procedure of calibrating or verifying the 

 model. The format for SHORM is the same as for SHORL.DAT. Thus, positions of 

 the shoreline are given in the units selected at Line A. 2 of the START file 

 and are measured from the baseline (x-axis). A shoreline position must be 

 given for each grid cell; i.e., there must be NN calculation cells as 

 entered at Line A. 3 in the START file. An example of a SHORM file is given in 

 Figure 25. 



295. GENESIS calculates a number called the "calibration/verification 

 error" (CVE) as the average of the absolute difference between the calculated 

 shoreline position (held in SHORC) and the measured shoreline position (held 

 in SHORM) at each grid point. This number conveniently summarizes in a single 

 value the degree of agreement between the calculated and measured shorelines. 

 The CVE should not be used as the sole criterion to judge the degree of fit 

 since a small value does not necessarily mean that the calculated and measured 

 shorelines are in close agreement along the entire calculated shoreline. As 

 an example, two shorelines may be in close agreement along most portions of 

 the beach but may be far apart along a small but very important section of the 

 beach. A small CVE value would not reveal this important discrepancy. Deter- 

 mination of the degree of fit is best done visually, which allows examination 

 of the overall fit. 



296. If the modeler specified at Line A. 4 in the START file that only a 

 portion of the shoreline will be used in the simulation, then only that 

 segment of the shoreline between and including the boundary cells is loaded 

 from SHORM. However, shoreline positions must be given for the full range of 

 the calculation grid (NN points), as GENESIS will load positions of the 

 shoreline subsection with reference to the original, full grid. 



297. Shoreline positions may be entered in "free format," i.e., with or 

 without a decimal. Individual entries must be separated by either a blank 

 space or a comma (or both) and placed in ascending order of grid cell number. 

 Exactly ten entries must be placed on each line, except for the last line . 



124 



