=(network_structure)

Network structure

A fundamental concept in MIKE IO 1D is the network structure. Every single result is attached to a part of the network. Knowing this structure will help you navigate to results you’re interested in. This sections provides a brief introduction to this structure. For additional information, refer to the MIKE 1D API.

Overview

MIKE result networks consist of the following four geometric types:

  • Nodes

  • Reaches (consisting of grid points)

  • Catchments

  • Global data

_images/NetworkExample.png

Figure 1 - A network consisting of nodes and reaches.

_images/NetworkCatchments.svg

Figure 2 - A network with catchments associated with nodes.

Reaches

A reach has many synonyms within different domain applications. In sewer models it is often called a link or pipe, in river models a branch, stream, canal or channel, and in graph and network theory it is called a link or an edge. A reach contains several ‘grid points’ along its path.

Grid Points

Grid points are the computational points along a reach. A flow model has different types of grid points:

  • H grid point: contains water level and an associated cross section

  • Q grid point: contains discharge or flow velocity.

  • Structure grid point: calculates discharge over a structure depending on the water levels on each side of the structure.

Nodes

Nodes are attached to one or more reaches. Nodes can be one of several types, including: manholes, basins, outlets, and junction nodes. They may or may not have a volume.

Catchments

Catchments are geographical areas associated with a result (e.g. hydrologic models consist of several catchments). They are connected to a point on the network (e.g. node or grid point).