START 



222. The input file START.DAT contains the instructions that control 

 the shoreline change simulation and is the principal interface between the 

 modeler and GENESIS. Once a generic START file for a project is prepared, 

 typically only a few quantities in it will need to be changed during the 

 course of verification, sensitivity testing, design optimization, etc. 



223. Figure 23 shows an example of a START file. The START file 

 contains requests for information in a series of lines arranged in sections 

 according to general subject. Lines of text (the request portion) should be 

 neither added nor deleted from the START file, as GENESIS will skip over these 

 request lines to read the input values. Also, the line request identifier 

 letter (A.l, B.l, C.l,...) should not be moved from column 1, as GENESIS looks 

 for it there. However, the number of lines holding values in response to a 

 specific request is arbitrary. Unless instructed otherwise, a response (an 

 alphanumeric character) must be given to a request. If several values are 

 required, they may be separated by a space or by a comma, or both. 



224. Names of internal variables, particularly values that will be used 

 to dimension arrays, are given in parentheses in the requests. To aid as a 

 reference in using this manual, the key variable associated with the request 

 is given at the start of each paragraph below. These names also appear in 

 error messages and are needed when discussing START file configurations with 

 others . 



A. Model setup 



225. Line A.l: TITLE . The first line of the START file requests a 

 project title, which may be up to 70 characters long. The title line normally 

 contains descriptive information about the particular run, for example, 

 "ILLUSTRATIVE EXAMPLE FOR MANUAL" or "LAKEVIEW PARK: CALIBRATION RUN." 



226. Line A. 2: ICONV . The variable ICONV is a flag telling 

 GENESIS the length units of the calculation. Calculations are performed by 

 using either meters or feet, as selected at Line A. 2. All length, height, and 

 depth inputs, including wave height, water depths, seawall positions, etc., 

 must be given in the specified units, and output will similarly be expressed 



104 



