Common AHPS/Hydrogen Operations

Common AHPS/HydroGen Operations

Mark Armstrong (OCWWS HSD)

February 14, 2012

1.0 Adding/Modifying/Deleting an AHPS Point

To initially define an AHPS point, the point must be defined as a river location with an assigned river basin in the location table. If a point is defined as a river location, then it just needs to be added to the HydroGen configuration table, hgstation. This is done through the Setup->HydroGen Configuration GUI inside hydrobase .

If creating a new AHPS point, the user would go to the location box, erase the current location identifier (LID) and enter the new LID. The user would then select the appropriate TypeSource (TS), Forecast TypeSource and physical element (PE) from the corresponding menus. When the user clicks the Save button, the new point will be saved to the hgstation table in the IHFS database.

If the user wished to modify a point or add a Physical Element/TypeSource/Forecast TypeSource to an existing location, they would select the location that they need to modify, make the necessary changes to the other parameters and click the Save button.

Deleting an entry in the hgstation table is as simple as selecting the LID/PE/TS/Forecast TS combination and clicking the Delete button.

2.0 Starting and Stopping HydroGen Backup

Starting and Stopping HydroGen backup is accomplished with the bless program. This should be installed as a shortcut in the AWIPS Hydroapps menu. It can be run in a terminal window by running the command: “/awips/hydroapps/HydroGen/bin/start_hg_bless”.

To start HydroGen backup, a user would select the checkbox next to the WFO that they wanted to start backup for and click the “Set Backup Mode Only” button. To stop HydroGen backup for another office, the user would uncheck the checkbox next to the WFO ID and click the “Set Backup Mode Only” button. As soon as the primary office returns to service, the HydroGen process for that office at the backup must be terminated. If both offices are creating and sending HML products, the correct data may not be displayed in the AHPS hydrographs.

3.0 Removing Bad Data from the AHPS Hydrographs

Occasionally, bad data will be sent to AHPS and will appear on the hydrographs available to the public. Removing the data is a straightforward process, but it will take some time before the corrections are displayed. The most efficient way to remove a bad data point is to use the Hydro Time Series application. A user will select the location and start the Tabular Time Series GUI. When the tabular display opens up, the user would select the physical element, duration, type source and time of the bad data point. For forecast values, the correct basis time must also be selected. The individual entries will be displayed in the large box in the middle of the display. When the bad data point is highlighted, the user would click the “Set to Missing” button. More than one data point may be selected by using Ctrl+click. The data value will be set to missing (-9999.00) and the posting time will be updated. When hydroGen runs again, it will pick up this missing value and send it to AHPS.The new missing value will be used to overwrite the previous bad value. NOTE: Deleting the data will not correct the hydrographs.