[Next Section] [Previous Section] [Table of Contents]

Full Equations (FEQ) Model for the Solution of the Full, Dynamic Equations of Motion for One-Dimensional Unsteady Flow in Open Channels and Through Control Structures

U.S. GEOLOGICAL SURVEY WATER-RESOURCES INVESTIGATIONS REPORT 96-4240

13.10 Input Files Block--Input File Table


Update available for HECDSS support

Purpose: Information describing files used to input flow or water-surface elevation at a flow-path end node is specified with this block. These files are referred to as Point Time Series Files (PTSF) (appendix 2) to distinguish them from the single DTSF used to specify the diffuse flows into the stream system. This block is required at all times and, if no files are input, a null block is specified.

Heading: One line of user-selected information. The suggested string is INPUT FILES.

LINE 1

Variable: HEAD

Format: A80

Example: UNIT NAME

Explanation: This is a user-supplied heading for subsequent information.

LINE 2 (one for each PTSF required)

Variables: UNIT, NAME

Format: I5, 1X, A64

Explanation:

UNIT is the Fortran unit number) (see appendix 3) of the PTSF to be read in FEQ. The block is terminated if a negative value for UNIT is given.

NAME is the left-justified file name for the PTSF file to be read in FEQ. The table must be present even if there are no input files. The block is then null consisting of only the heading and a - 1 in the UNIT column. Each input file is associated with a single flow-path end node by specification the negative of the unit number in the source field for a forced boundary condition (CODE=6) in the Network-Matrix Table) (section 13.6).

Specification of point inflows in a PTSF can be applied whether or not a DTSF is present. If a DTSF is used, the user must ensure that all required time segments are included in the file. The input/output file system was designed to permit subdivision of a large system at points of known hydraulic control such that a series of smaller systems could be analyzed in sequence from upstream to downstream to represent the larger system. In a case where a large stream system is subdivided in smaller subsystems, the output from an upstream subsystem is stored in a file for later use as input to the downstream system. For this approach to work properly several conditions must be satisfied. First, the same DTSF must be used for all subsystems to ensure that the same length and sequence of time segments appears in all input/output files. Second, the points of subdivision must be at points of known relation between flow and stage in the stream (control points). If this is not the case, then the subdivision of the system into smaller parts will distort the results. If no control points can be identified, then the system should not be subdivided.


[Next Section] [Previous Section] [Table of Contents]