SED2D obtains its run control data from a set of input data cards provided in run
control files. These data cards conform to what is known as HEC format. Each card
has 80 columns of characters in which to hold its data. The first three columns are
reserved for the card name, so there are actually 77 columns in which to hold
A data card occupies a single line in the run control input file. The card line is
divided into data fields, of which the first contains the card name, and is designated
as field 0. Field 1 begins the actual data for the card. SED2D uses a free field
format for data card input. Each item of data constitutes a field. There can be as
many fields on a card as there is room within the 80 columns of characters.
Note: If more than one card modifies a variable, the last card rules.
Summary of Run Control Data Cards
Input to the program consists of card image data in data files. The following
paragraphs describe the input data in detail.
Information cards T1, T2, T3, $D
These cards contain descriptive information used to identify a model run. As many
T1 and T2 cards can be used as are needed. The final title card must be a T3 card.
Information on the T3 card is saved with the program output files (along with data
management banners, if used), so it can be used to identify the data file. The $D
card permits the user to tag the beginning date of simulation for information
purposes (but this information is not used by the program).
Run control cards: $L1, $L2, $H, END, STOP, TO,
These cards are used to control various aspects of program control. The $L1 and
$L2 cards are used to specify which input and output files the program will use. The
54 Run Control
Users Guide To SED2D-WES