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.

Model integration

Both the water resources model as well as the water quality model (Figure 6) use network-based scenarios. Through sharing the generic layer of the RiverNetworkObject, and therefor the linked RiverBasinObjects, the consistency of the scenarios of various related models can be guaranteed.

The models, though spatially distributed, operate on a schematic representation of the river; this, in turn, is linked to the actual spatial location, and thus can be mapped at the GIS level, through the spatially referenced RiverBasinObjects of the system, which in turn link to the spatial objects (overlays) in the GIS.

A different strategy is used for the spatially aggregated irrigation water demand estimation model and the rainfall-runoff model. They both operate with spatially averaged parameters defined for unit irrigation ares or hydrologically homogeneous subcatchments. These parameters are derived from the underlying, more detailed spatial objects such as a digital elevation model, and geological, soil, and landuse maps. The translation between a fully spatially explicit description, where available, and the model's interpretation is accomplished by the methods of the ModelScenarioObject that draws its data from the respective RiverBasinObjects and their underlying GIS layers; when using alternative models, that have a different spatial resolution, the only necessary change is the addition of another method to derive the appropriate data representation.

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