The application of non-destructive methods to assess the stability of the national nature monument of the Pravčická Brána Rock Arch, Czech Republic

Abstract

The purpose of this study is to contribute to the general understanding of air transport organization and creation of air interactions in view of three issues -distance, integrity and hierarchy. Although these issues are generally known from literature, they were not properly studied in the case of air transport. Therefore, the article brings a new perspective on the issue of air transport evaluation, the delimitation of functional regions based on air transport interactions, and the evaluation of their hierarchical organization. We analyze the database of flights between civil airports in Central Europe. We specify hinterlands of individual airports by using the modified version of Reilly's gravity law. The main results of this study confirmed the dominance of main airports (mainly Frankfurt and Vienna), while confirming a relatively large autonomy of airports localized in the former socialist countries (Warsaw, Prague).

Key issues in 3D rockfall modeling, natural hazard and risk assessment for rockfall protection in Hrensko (Czechia)

“…1). Hřensko area is characterized by a sandstone landscape with rock plateaus, deep canyons with several levels of steeply cliffs and rock cities, which form favourable conditions for rockfalls (Kalvoda and Zvelebil, 1983;Tyráček, 2001;Vařilová and Zvelebil, 2007;Blahůt et al, 2013;Vařilová et al, 2014).…”