<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The geological environment is undoubtedly one of the basic factors that influence the formation of surface runoff. The extent to which this factor can also affect the hydrodynamic characteristics of flash floods, which is also indirectly associated with flood risk, is the main topic of this study. In two geologically different areas of the Bohemian Massif (crystalline rocks predominate) and the western Carpathians (flysch rocks predominate), a total of 40 watersheds characterised by sharing a certain hydrological analogy were selected (20 watersheds from the Massif and 20 from the Flysch zone). In each of these watersheds, 1-year, 10-year and 100-year flash flood return periods were constructed using the two-dimensional hydrodynamic model Iber. The outputs from this model included raster datasets of areas, depths, and flow velocities during inundations. Subsequently, these rasters were analysed and compared with an emphasis on differences within the individual geological study areas. The outputs showed clear differences in the individual hydrodynamic characteristics (e.g. the average inundation area during Q<sub>100</sub> was 29.07% larger in the Flysch than in the Massif). Overall, the Flysch zone appeared to be far riskier in terms of flash floods than in the case of the Bohemian Massif.</p>
</abstract>

The geological environment is undoubtedly one of the basic factors that influence the formation of surface runoff. The extent to which this factor can also affect the hydrodynamic characteristics of flash floods, which is also indirectly associated with flood risk, is the main topic of this study. In two geologically different areas of the Bohemian Massif (crystalline rocks predominate) and the western Carpathians (flysch rocks predominate), a total of 40 watersheds characterised by sharing a certain hydrological analogy were selected (20 watersheds from the Massif and 20 from the Flysch zone). In each of these watersheds, 1-year, 10-year and 100-year flash flood return periods were constructed using the two-dimensional hydrodynamic model Iber. The outputs from this model included raster datasets of areas, depths, and flow velocities during inundations. Subsequently, these rasters were analysed and compared with an emphasis on differences within the individual geological study areas. The outputs showed clear differences in the individual hydrodynamic characteristics (e.g. the average inundation area during Q100 was 29.07% larger in the Flysch than in the Massif). Overall, the Flysch zone appeared to be far riskier in terms of flash floods than in the case of the Bohemian Massif.

A comparison of the hydrodynamic characteristics of surface runoff generated by flash floods in geologically different areas of the Bohemian Massif (crystalline rocks) and the western Carpathians (flysch)

Department of Physical Geography and Geoecology, Faculty of Science

Department of Physical Geography and Geoinformatics, Faculty of Natural Science

Moravian Geographical Reports

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The geological environment is undoubtedly one of the basic factors that influence the formation of surface runoff. The extent to which this factor can also...

A comparison of the hydrodynamic characteristics of surface runoff generated by flash floods in geologically different areas of the Bohemian Massif (crystalline rocks) and the western Carpathians (flysch)

Published Online: Jul 12, 2022

Page range: 134 - 148

Received: Oct 30, 2021

Accepted: Apr 20, 2022

DOI: https://doi.org/10.2478/mgr-2022-0009

Keywords
Flash floods, 2D hydrodynamic modelling, factors affecting floods, flood risk, Flysch zone, Bohemian Massif, Iber model, Czech Republic

© 2022 Vilém Spálovský et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

A comparison of the hydrodynamic characteristics of surface runoff generated by flash floods in geologically different areas of the Bohemian Massif (crystalline rocks) and the western Carpathians (flysch)

Published Online: Jul 12, 2022

Page range: 134 - 148

Received: Oct 30, 2021

Accepted: Apr 20, 2022

DOI: https://doi.org/10.2478/mgr-2022-0009

KeywordsFlash floods, 2D hydrodynamic modelling, factors affecting floods, flood risk, Flysch zone, Bohemian Massif, Iber model, Czech Republic

© 2022 Vilém Spálovský et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Flash floods, 2D hydrodynamic modelling, factors affecting floods, flood risk, Flysch zone, Bohemian Massif, Iber model, Czech Republic