14.5 1D Output File
The .eof file is both a summary file for the 1D, as well as a results file. It contains the 1D domain input datasets, including a complete output of the final input data before the simulation commences. For example, if a second table overwrites a channel cross-section properties table during the input process, the table in the .eof file relates to the second table. Similarly, adjustments to data, for example, a datum shift in a gradient channel’s cross-section based on the upstream and downstream inverts, are also incorporated. The .eof file contains the final dataset that is used by the simulation.
By default the .eof file also contains a result summary of the simulation, including useful information such as culvert flow regimes at each output time, time of maximum water level, etc. The channel and node regime flags are located in the two spaces after the velocity, flow and head values in the time based output. The flags, described in Table 14.2, are useful for interrogating the hydraulic regime at nodes and channels. The writing of the outputs in the .eof file can be suppressed by the
| Flag (Space 1) | Flag (Space 2) | Description |
|---|---|---|
| * | The depth at a node fell below -0.1m. A WARNING is also output to the _messages GIS layer (see Section 14.4.5. The occurrence of significant negative depths may cause mass conservation errors in the 1D domain. | |
| * | One end of a normal channel is close to being dry and a transitioning algorithm was used to dry/wet the channel. | |
| # | The gradient channel algorithm was applied. This occurs when one end of the channel is either dry or very shallow. The gradient channel algorithm applies a weir equation at the dry or shallow end in combination with the momentum equation by adjusting the water surface slope along the channel. | |
| A | Adverse flow (i.e. flow gradient is against the slope of the channel). | |
| D | Upstream controlled friction flow occurred in a Steep (S) channel when the downstream end was dry. | |
| S | Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number greater than one (1). | |
| T | Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number between 0.5 and one (1). T stands for Transitioning from normal flow to upstream controlled friction flow. | |
| N | Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number less than 0.5. N stands for normal flow, however, in this case the upstream controlled friction flow approach was adopted. This may occur during the transitioning of flow from downstream controlled to upstream controlled. If it occurs repetitively, the configuration of the channel should be reviewed. | |
| Culvert Flow Regime Flags | The culvert flow regime flag as documented in Table 5.6. Culvert channels only. | |
| E | The channel or node is empty or dry (i.e. the head or water level is at the bottom of the node). E stands for Empty. | |
| F | The head exceeds the top of the nodes elevation versus surface area table (NA table). F stands for Full. | |
| F | The head at the mid-point of the channel exceeds the top of the channel’s hydraulics properties table (CS table). F stands for Full. | |
| L | The velocity rate limit was applied to the channel to try and prevent oscillations or instabilities – non-inertial channels (structures) only. See Vel Rate Limit. | |
| O | For a Dam Failure type channel, the overtopping dam crest before dam failure. For a Arch Bridge or BB bridge type channel, the orifice flow. | |
| R | Reverse flow (i.e. flow in the opposite direction to the channel’s digitised direction). | |
| U | The uni-directional flag assigned to the channel was invoked and the velocity/flow was set to zero. | |
| W | For a Sluice Gate type channel, the flow is not in contact with the sluice gate and the channel has reverted to Weir or Rectangular channel flow as outlined in Section 5.9.5. |