Creating a retrospective run

Creating a retrospective run with or without routing

Problem

You need to create a new retrospective run. There can be a number of reasons for this, for example

• new nowcast/forecast project
• new or updated meteorological forcings
• change in retrospective period

Method

A long-term retrospective run is typically performed in the following way:

1. The hydrological model is run with a cold start for the full retrospective period for which meteorological forcings are available (e.g. 1915-01-01 through 2005-12-31)
2. The model state from the end of the run is recycled and use to restart at the beginning of the run (e.g. the state file from 2005-12-31 is used to start on 1915-01-01)
3. The model is then run for one year (e.g. 1915-01-01 through 1915-12-31)
4. The state file from the end of the run is again recycled to restart at the beginning of the run (e.g. the state file from 1915-12-31 is used to start on 1915-01-01)
5. The previous two steps are repeated 10 times
6. The model is then restarted one final time and allowed to run through the end of the retrospective period (e.g. 1915-01-01 through 2005-12-31)
7. The first year is discarded from any further analysis.

Script(s) to run

Expected outcome