*************************************************************** 



SHORELINE MEASURED AT SUNNY DAYS BEACH 1 JAN 1988. 



DATA WERE TAKEN FROM DIGITIZED AERIAL PHOTO. DX - 300 FT. 



100.0 100.1 100.2 100.4 100.5 101.0 101.7 102.0 102.8 103.5 



103.9 102.9 103.0 103.5 103.8 104.6 104.3 106.3 107.0 107.4 



108.0 100.1 101.2 103.4 105.9 109.0 100.1 103.6 106.8 109.2 



131.1 133.6 134.9 136.1 138.5 140.0 141.1 



Figure 25. Example SHORM file 



SEAWL 



298. The input file SEAWL.DAT holds the positions of one or more 

 seawalls or effective seawalls with respect to the baseline and specified in 

 the proper length units. An "effective" seawall might be a road or large 

 structure past which the shoreline is not expected to erode or be allowed to 

 erode. GENESIS prevents the shoreline from eroding landward of the position 

 of a seawall, whereas at reaches without seawalls the shoreline can retreat 

 essentially without limit. If a seawall is not specified, an effective 

 seawall is placed at -9999 m or ft (depending on units selected) by GENESIS, 

 and SEAWL is not read. If seawalls are specified along some sections of coast 

 but not others, the sections without seawalls should be similarly assigned a 

 distance of -9999 m or ft by the modeler. Figure 26 gives an example of a 

 SEAWL file. 



299. Similar to the case of preparing a SHORL file, if a seawall was 

 specified to exist on the grid, the location of the seawall(s) (or -9999 for 

 each cell between seawalls) must be entered on the full calculation grid (NN 

 values), even if only a subsection of the grid will be modeled. Seawall 

 positions are entered at shoreline position points, i.e., at the centers of 

 grid cells. 



300. Seawall positions alongshore 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 

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

 last line. 



125 



