Publication details
THE AIZM FLOOD MODEL - ACCURACY AND PERSPECTIVE IN THE GEOMORPHOLOGICAL RESEARCH
| Authors | |
|---|---|
| Year of publication | 2015 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | The AIZM flood model (originally in slovak 'Alternatívny Indikatívny Záplavový Model) works on the basis of chaining of several tools in the ArcGIS Model Builder. It represents an alternative to hydrodynamical models. Amongs the advantages, low amount of the input data should be emphasized (the relief data, the course ot stream's axis and the height of water level above the river bed at a given point). Despite the fact that the modelled flood extends (from hydrodynamical models) are available for many sections of rivers in the Czech republic, in many other cases the modelled flood extends are absent. In order to be able to compare the diferences of flood extends computed by hydrodynamical models and the AIZM flood model, over 30 sections of czech rivers were chosen. Among them, 6 types of streams were sorted out (1. straight channels, 2. large meanders, 3. small meanders, 4. confluence of equal rivers, 5. confluence of unequal rivers, 6. bifurcation). All the sections have had the modelled flood extends available and the AIZM flood model was used to compute the inundation extend. Further, the diferences between modeled extends of inundations were measured, also with regard to the input data for the digital terrain model (DMR 4G, DMR 5G by Czech Office of Surveying, Mapping and Cadastre). It has been found out, that the accuracy of the AIZM flood model is related to the type of stream and to the parametres of the relief. The crucial moment is connected with the generation of the digital terrain model on the scale of a river bed. Regarding the obtained outputs, it was possible to choose types of rivers where the use of the AIZM flood model is relevant, as well as those where the model produces incorrect results. The AIZM flood model is a relatively universal tool which may (and will be) be further modifyed. It can be used in all disciplines focused on the flood extend, including dendrogeomorphological research of flood events. |