1. Introduction
This tutorial will guide the user in how to download the online data from some global models and apply them into the model domain. At the moment, EE10 supports some common data types including Bathymetry, Water Elevation, Salinity, Water Temperature and other data type such as Wind, Atmospheric, Water Velocity,... will be added in the next versions. The data downloaded can be used in setting up Initial Conditions as well as Boundary Conditions.
Please note that, the data is from global model not actual data meter, mainly focus on ocean area, so, the accuracy and availability of data are not consistent in both space and time.
The grid used for this tutorial is from Tra Khuc Estuary, Vietnam demo model. All files for this tutorial are contained in the Demonstration Models of the Resources page folder file (DM-04_Tra_Khuc_SedTrans_Example).
2. Set UTM Zone for Grid Model Domain
By taking grid from the demo Tra Khuc model, the grid is displayed as Online Download Data Feature in EEMS10.0. Note that the geography of grid model domain is very importance for accuracy of data downloaded, so the user needs to set UTM Zone correctly as shown in Online Download Data Feature in EEMS10.0. Tra Khuc Estuary, Vietnam is located at UTM Zone 49. Enter 49 to UTM Zone then click OK button. The user can define UTM zone of grid model domain with Google Earth software.
Other way to set UTM Zone for grid domain in EE10 is the user RMC on Grid in Model Grid of Model Control, then set UTM Zone as shown in Online Download Data Feature in EEMS10.0.
Figure 1. Set UTM Zone for grid domain.
Figure 2. Set UTM Zone using Grid Generator.
3. Download Initial Conditions Data
Bathymetry Data
In Initial Conditions menu, RMC on Bathymetry, a Bathymetry form will be appeared as Online Download Data Feature in EEMS10.0 Click on Download button, Download Online Data form will be displayed , the data can be downloaded from three data sources in the Data Set as Online Download Data Feature in EEMS10.0.
Figure 3. Bathymetry form.
Figure 4. Download Online Data form.
Bathymetry data here is the latest data from the open sources so the Time Range and Temporal Information are gray out. The user simply choose the data source by click on Data Set drop-down menu and then click on Download button and wait for awhile of download completed, the time of data download depends on the scale of the grid domain. Right after the download completed, the from will be closed and a report for Max, Min, Mean values as shown in Online Download Data Feature in EEMS10.0 The user can see bathymetry by go to 2DH view as shown in Online Download Data Feature in EEMS10.0.
Figure 5. Initial Bathymetry report by using downloaded online data.
Figure 6. 2DH view for downloaded bathymetry data.
Water Depth/Elevation Data
Similarly to download bathymetry data as presented above, the user RMC on Water Depth/Elevation then do some same steps as above. After click Get button, fields information of the dara source will be updated to Temporal Information as Base Date, Begin, End, Interval and number of data points (#). In Time Range, the user needs to enter a date that is begin date for model simulation (Model Timing). But it requires the date be inside of the Begin - End period of Temporal Information.( e.g 2019-01-01) as shown in Online Download Data Feature in EEMS10.0. The user should be note for the Time Zone, for example time zone of Vietnam is GMT+7 and the time zone of data is GMT+0 so the user needs to enter 7 to the Time Zone. Finally, click Download button. The user can see water surface elevation by go to 2DH view as shown in Online Download Data Feature in EEMS10.0.
Figure 7. Download Online Data for Water Elevation.
Figure 8. 2DH view for downloaded Water Elevation data.
Download other IC Data
The user can download other initial conditions data as Salinity, Water Temperature etc in case the open data source is available for the grid model domain.
4. Download Boundary Conditions Data
- Firstly, user have to define the boundary cells, In this example, we will download online data for East Open Boundary. About how to set the East Open Boundary condition for all east cells, please follow Section 4.3.2 (Assigning Tides Boundary) from step 1 to 6. we will got the 2DH same with Figure 9
Figure 9. Setting up East Open Boundary conditions.
- Next, go to Tool | Download Online Data | Model Boundary Conditions, A form called Download Online Data for Boundaries is appear in Online Download Data Feature in EEMS10.0
- In this form, user can choose the Boundary that want to get the data, set the Data Type and Data Set. Then, choose the download time interval and Click on Get Data button to download. Please note that, the time interval must be inside the time interval available of the Data Set, user can get this information by clicking on Get Time button.
Figure 10. Download Online Data for Boundaries form.
- Once the data is downloaded, user can check it by viewing time series of the boundary conditions Online Download Data Feature in EEMS10.0
