Attributes contain all the data and information beyond the geometry, such as material data, boundary conditions and auxiliary data.

Once the generation of the mesh geometry is completed and checked, attributes can be assigned to the nodes and elements. There are two options for assigning data based on the structural data.

• Direct assignment: Nodes or element centres that are located sufficiently close to structure points with data or information are assigned those values.

• Assignment by interpolation: Due to "isolated" or scarce structure data points, values are interpolated between the corresponding structure points for the nodes or element centres.

Example:

The structure of a receiving watercourse only has information for the water elevation at the gauging stations. Between these data points, there are any number of other nodes without water elevation data. These nodes are assigned linearly interpolated values by means of Assignment by interpolation.

In addition to assignment via structures, attributes can also be assigned directly or stochastically to nodes or elements, individually or by using polygonal areas.

The chapter "Description of data types" lists all possible attributes".

The structure of a horizontal groundwater model is described in detail in the chapter "Structure of a 2D model".

Calculation modules