The methodology and methods of the watershed environmental modeling with GIS are represented. In particular, the surface topography and hydrological event simulation have been considered. The authors also discuss the crucial peculiarities of geomorphologic systems as a modeled subject. The original watershed GIS-model has been outlined as well as a set of its constituents: mathematic model of the formalized fluvial topography representation, the algorithm of hydrological runoff routing through a digital elevation model, the general and particular algorithms of the channel network definition. There are a few examples of the modeling software GUI with respect to the represented GIS-model implementation. It is indicated on possibility of the use of this software for the decision of different applied tasks at the management of watershed basins.

• Костріков Сергій Васильович (географічні науки)

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