Reports and Papers

Fedra, K. and Jamieson, D.G.
An object-oriented approach to model integration: a river basin information system example. In: Kovar, K. and Nachtnebel, H.P. [eds.]: IAHS Publ. no 235, p669-676.

The river network

The water quality model uses a network representation of the river section under study; this network provides the river geometry, as well as the linkage to the functional elements. River networks consist of the following object classes:

  • The RiverNetwork itself
  • RiverNodes
  • Reaches
  • CrossSections.

A RiverNetworkObject may contain a set of RiverNode, Reach and CrossSection objects. Each of these object classes have data which can be be divided into two layers, a generic and a model specific one. While there is a single generic representation for each network which primarily contains the connectivity information and provides the linkage to the actual geographical, positional information, there may be several model specific extensions for different models and their different data requirements. RiverNodes are inheriting basic information from the corresponding RiverBasinObjects; Reaches can also derive some of their attributes such as lateral inflow from RiverBasinObjects, e.g., an irrigation district or an aquifer.

A specific interactive network editor assists in the design of networks and facilitates the linking of concrete RiverBasinObjects to the abstract RiverNodes of the schematic network (Figure 5) . In addition to inheritance of properties from these objects, the embedded expert system supports estimation of node- or reach specific parameters such as roughness.

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