EEMS provides access to a number of online data sources that can be used to automatically populate time series. These should be used with care and we do not guarantee the quality of the data. Access to this feature is provided from the Tools menu, and selecting Download Online Data. There are three sub-options: Model Open Boundary Conditions, Tidal Level for Model Boundaries, and Tidal Harmonics for Station as shown in Figure 1.
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Merge with Existing Series: This option will update the downloaded data to the existing boundary data series.
Replace Existing Series: This option will replace current boundary data series with new downloaded data series.
Separated Series for Each Cell: This option will create a time series for each boundary cell and name it using I and J indices of the cell.
Time Zone: zero UTC as a default value, so we may need to enter a time zone hereMost of global data are based on time zone 0 (UTC). There for, you need to provide the correct time zone as the number of hours shifted from UTC for you model.
Get Data: Once we complete fields and options in the Download Options frame, click the Get Data button to start downloading data, and after that, we will see the message "Download data is ready. Click OK button to apply". Now click the OK button to apply the downloaded data to the cells.
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The online data source for the harmonic constants can be selected from the Data Set drop-down list. Currently, there is only one data set for the harmonic constants from HAMTIDE model with the grid resolution of 7.5 arc minutes for 8 tidal constituents of M2, S2, N2, K2, K1, O1, Q1, P1. More data sources for tidal harmonic constants will be added in the future. This tidal harmonic constants will be use used to generate time series of water surface elevation at model boundary cells using the same approach the same as the Generate from Harmonics Option for water level forcing data.
Get Data: Once everything is ready, click the Get Data button to download the harmonic data. EE will populate a table fields including ID, Name, Speed, Amplitude, and Phase, as shown in Figure 6. The OK button will now be enabled. Click the OK button so that tidal time series of the selected three cells are added to Water Level in External Forcings Data. These time series can be used to assign to open boundaries when needed.
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