Vedecké časopisy a ročenky vydávané na pôde SAV

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Geografický časopis


Volume 61, 2009, No. 1

Content:


  Effect of the input parameters on the spatial variability of landslide susceptibility maps derived by statistical methods. Case study of the Valtellina valley (Italian Central Alps)
Jan Blahůt 1), Simone Sterlacchini 2), Cristiano Ballabio 3)

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1)Department of Environmental and Territorial Sciences, University of Milano-Bicocca, Institute for the Dynamic of Environmental P, Piazza della Scienza 1, 20126 Milano, Italy. jan.blahut@unimib.it
2)Institute for the Dynamic of Environmental Processes, National Research Council (CNR-IDPA), Piazza della Scienza 1, 20126 Milano, Italy. simone.sterlacchini@unimib.it
3)Department of Environmental and Territorial Sciences, University of Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy. cristiano.ballabio@unimib.it


landslide susceptibility mapping, Weights of Evidence, spatial variability, Kappa Statistic, Cluster Analysis, Principal Component Analysis

This study is aimed at assessing different spatial patterns of predicted values of landslide susceptibility maps with almost similar success and prediction rate curves. Our approach is applied to an alpine environment (Italian Central Alps) where debris flows represent a frequent damaging phenomenon. The Weights of Evidence modelling technique (a data driven Bayesian method) was applied using ArcSDM (Arc Spatial Data Modeler) an ArcGIS extension. The output prediction maps were reclassified in the same way to compare the predicted results: a relative classification, based on the proportion of the area classified as susceptible, was made. The thresholds among different susceptibility classes were put at each 10 % of the study area, classified decreasingly from the highest to the lowest susceptibility values. After applying Kappa Statistic, Cluster Analysis, and Principal Component Analysis (PCA), we analysed the spatial variability of the predicted maps. The results have shown great differences within the output spatial patterns of the predicted maps, and also within the highest susceptibility classes.

Geografický časopis. Volume 61, 2009, No. 1: 3-18.

 
  Biogeomorphic effects of trees on rock-mantled slopes: searching for dynamic equilibrium
Pavel Raška 1), Tomáš Oršulák 2)

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1)Department of Geography, Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic. pavel.raska@ujep.cz
2)Department of Geography, Faculty of Science, J. E. Purkyně University, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic. tomas.orsulak@ujep.cz


slope development, tree trunks, biogeomorphology, nonlinear dynamics, Czech Middle mountains

Slope development remains one of the central points of geomorphological research, which results in a continuing discussion about concepts proposed by classics of geomorphology (Davis, Penck, King, etc.) on the one hand, as well as in new methodical approaches applied to the study of slopes in concrete environments on the other. The research presented applies the biogeomorphological methods and concept of non-linearity in the assessment of short-term dynamics of the middle segment of rock-mantled slopes in the protective forests. In contrast to general concepts, it is shown that even in the mid-slope, where the permanent prevalence of denudation is usually assumed, the bioprotective and bioerosive effects of trees (trunks) may cause significant variations in the balance between accumulation and denudation.

Geografický časopis. Volume 61, 2009, No. 1: 19-28.

 
  Implementácia nástrojov tektonickej geomerfológie v neotektonickom výskume (na príklade pohoria Považský Inovec)
Juraj Beták 1), Rastislav Vojtko 2)

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1)Geografický ústav SAV, Štefánikova 49, 814 73 Bratislava. geogbeta@savba.sk
2)Univerzita Komenského, Prírodovedecká fakulta, Katedra geológie a paleontológie, Mlynská dolina, 842 15 Bratislava. vojtko@fns.uniba.sk


neotectonics, tectonic geomorpholology, morphotectonics, geomorphological analysis, Považský Inovec Mts.

An effective solution of neotectonic problems requires an interdisciplinary approach. In this paper, we present the frame of geomorphological approaches, which can contribute to understanding of the neotectonic problems. Various geomorphological methods (including morphometric analysis of the relief forms, analysis of morphotectonic lines, patterns, mountain front lines, facet slopes, flat surfaces, profile curves, valley textures and positions of alluvial fans) were applied in the area of the Považský Inovec Mts. The interconnection between the shapes of geomorphic forms and the potential of their formation by the neotectonic processes are widely discussed. The most obvious features of the recent tectonic activity observed in relief forms were identified in the area of the western mountain front line documented by occurrence of low dissected facet slopes and the mountain front line (with a value of the S index of only 1.09), well preserved upper flat surfaces and the even concave and levelled shapes of the longitudinal bottom valley profiles. Notable morphotectonic features were also analysed in other localities. The results of overall geomorphologic analyses were compared with other neotectonically significant data. From the spatial point of view, the data complement each other, which supports the idea of an interdisciplinary approach for better comprehension of the neotectonic problems. However, the chronological aspect is more heterogeneous. We discuss the disproportions between the traditional concepts of the Western Carpathian relief evolution and some of the recently gained numerical or relative geochronological data.

Geografický časopis. Volume 61, 2009, No. 1: 29-47.

 
  Globalizácia maloobchodu: definícia základných procesov a ich analýza v slovenskej geografii maloobchodu
František Križan 1)

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1) Univerzita Komenského v Bratislave,Prírodovedecká fakulta Katedra regionálnej geografie, ochrany a plánovania krajiny, Mlynská dolina, 842 15 Bratislava. krizan@fns.uniba.sk


globalization, internationalization, cooperation, concentration, retail, retail geography

The paper deals with globalization processes in the retail sphere of Slovakia. The aim of the paper is to characterize globalization in the Slovak retail sphere and processes related to globalization such as cooperation, internationalization and concentration from the point of view of retail geography based on studies by Slovak geographers. Fundamental globalization terms from the point of view of retail geography are defined in the paper and possibilities for future research into this issue are outlined.

Geografický časopis. Volume 61, 2009, No. 1: 49-68.

 
  Regionální diference rizika delokalizace technologicky vyspělých oborů zpracovatelského průmyslu na příkladu České republiky
Jan Ženka 1), Vladislav Čadil 2)

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1)Ostravská univerzita v Ostravě, Přírodovědecká fakulta, Katedra sociální geografie a regionálního rozvoje, Chittussiho 10, 710 00 Ostrava, Česko. janzenka@osu.cz
2)Technologické centrum AV ČR, Rozvojová 135, 165 02 Praha 6, Česká republika. cadil@tc.cz


delocalization, processing industries, regional differences, Czech Republic

The aim of this article is to find out whether the companies active in technological manufacturing industries in the Czech Republic oriented to simple manufacturing and assembling activates with low added values are concentrated in economically less advanced regions. The labour market in regions with a pronounced concentration of these “footloose” companies can be threatened by moving of production units abroad in order to save costs. Assessment of the localization stability of companies is based on the statistical analysis of three indicators representing the technology capital intensity of the manufacturing process, value chain complexity, and sophistication of production operations. The hypothesis about concentration of internationally mobile companies in economically weak regions with high unemployment rate and accessibility of investment incentives was not confirmed. Companies considered prone to delocalization are represented in all types of regions including the metropolitan ones. Location of technologically advanced branches does not respond either to the settlement hierarchy or to the economic performance of regions. Regional differences in indicators of localization stability show a distinct dependence on the development before 1989.

Geografický časopis. Volume 61, 2009, No. 1: 69-86.