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Natural landforms are of great importance for a variety of scientific and engineering disciplines. Investigation of landforms can beimproved by comparison of features that have similar characteristics, structure and genesis. We propose a novel framework for therepresentation of the temporal aspects of landform development that simplifies the complex spatial relationships between 3D objectsand the modelling of geological processes over time (4D) applying the Poincaré Duality. Single landform layers are represented asnodes (DualStructures) and the neighbourhood of these layers are represented as edges (DualStructureRelations). Finally, aDualStructureState represents a whole landform of stable conditions over a period of time. Change of a landform is represented asadditional edges (Abstract_GeoProcess) between the nodes of different layers. The overall structure constitutes a multilayer graph,where all the nodes from all N layers are included but are separated into N partitions of time. All dual representations may beassociated with geometric and semantic representations, if available. A formal data model on natural landforms focusing ontopological representation is a major step towards the interoperable exchange and comparison of scientific results on landforms.Concerning existing models, our framework can be considered as a superset with regard to model expressivity. This will improve thepossibilities to exchange or link data between different application fields

A TOPOLOGICAL FRAMEWORK FOR THE TEMPORAL ASPECTS OF LANDFORM DEVELOPMENT