Geomorphologia Slovaca et Bohemica   
JOURNAL ABOUT CONTEPORARY GEOMORPHOLOGIC PROBLEMS
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Geomorphologia Slovaca et Bohemica
1/2011

Content/Obsah

JAROMÍR KOLEJKA - MILOŠ TEJKAL: 
Využití laserových modelů terénu v geomorfologickém výzkumu
   
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MAŁGORZATA WISTUBA - AGATA SADY: 
Walachian colonisation on mountain ridge recorded in alluvia of the Škorňanský stream (The Moravskoslezské Beskydy Mts., Western Carpathians, Czech Republic)
 
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PIOTR GIERSZEWSKI: 
Impact of the Włocławek Reservoir on the conditions for the transport of suspended load
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JAROMÍR DEMEK - PETER MACKOVČIN - PETR SLAVÍK:
Rock pediments and bahada in the Frenštátská brázda Furrow (the Moravian-Silesian Carpathians, Czech Republic) 
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Abstracts/Abstrakty

Jaromír Kolejka, Miloš Tejkal:
Application of laser scanner terrain models in geomorphological research
Geomorphologia Slovaca et Bohemica, 11, 2011, 1, 7 - 17.
10 figs., 1 tab., 16 refs.

A high quality DTM can be provided by the laser scanning (LIDAR – Light Detection and Ranging). Main principles both the ground and airborne laser scanning of terrain are presented and discussed in the paper. While the ground application is useful for scanning relatively small terrain objects and earth constructions (especially for those with steep walls), the airborne laser scanning is efficiently applicable for large areas. The airborne laser scanning seems to be very useful for the construction of DTMs in densely built up areas, forested landscapes, terraced slopes, areas with dynamic terrain processes or flooded areas. The process of point cloud processing is depicted and the derivation both of the digital surface model (DSM) and digital terrain model described. The results of these processes are demonstrated on the example of the Svitava River valley (15 km to the north from the City of Brno, Czech Republic). The improved quality of a laser scanner DTM is visible in comparing with a classical DTM of the same area derived from a contour lines map. The DTM and the digital landscape cross section, both constructed using laser scanner data serve various land form studies. Possible efficient geomorphological applications of the detailed laser scanner DTM are listed by the end of the paper. The written text is accompanied with figures explaining principles of this technology and examples of 2D and 3D terrain model from the study territory.
Key Words: ground and airborne laser scanning, DTM, land form research application

 

Małgorzata Wistuba, Agata Sady:
Walachian colonisation on mountain ridge recorded in alluvia of the Škorňanský stream (The Moravskoslezské Beskydy Mts., Western Carpathians, Czech Republic)
Geomorphologia Slovaca et Bohemica, 11, 2011, 1, 18 - 27.
5 figs., 1 tab., 33 refs.

The aim of presented study is to: (1) investigate geomorphological effect of Walachian colonisation on fluvial relief of small mid-mountain valley, (2) to prove the relation between overbank deposition of studied stream and pastoral land-use of its catchment. The methods conducted were: (1) geomorphic mapping, (2) mapping of terraces lithology, (3) lithofacial analysis of alluvia, (4) plant macrofossil and (5) organic coal content analyses. In the mouth of the Škorňanský stream inset alluvial terrace exist. It is composed of fine, overbank deposits (mud to sand) with a tendency of upward grain-coarsening. Plant macrofossils extracted from alluvia are characterized by: (1) upward decrease of treeleaf findings and increase of conifer needles amount in studied profiles, (2) presence of seeds and fruits from species typical for meadows, pastures, segetal weed communities, (3) presence of charcoal and other burnt remains – locally over 50 % of findings. Achieved results allow to connect the deposition of overbank alluvia and creation of inset terrace with deforestation of the catchment of the Škorňanský stream (from the turn of the 17th century). Forest exploitation was conducted by Walachian, pastoral settlers, and in order to produce charcoal for iron-smelters.
Key words: inset terraces, anthropogenic alluvia, plant macrofossils, pasturing, Walachian colonisation, Moravskoslezské Beskydy Mts.

 

Piotr Gierszewski:
Impact of the Włocławek Reservoir on the conditions for the transport of suspended load
Geomorphologia Slovaca et Bohemica, 11, 2011, 1, 28 - 41.
10 figs., 2 tabs., 29 refs.

The article presents the conditions for the spatial diversity of the concentration of suspended load in the Włocławek Reservoir. The main components of suspended load, namely the mineral and the organic ones, as well as the grain size of mineral suspension were characterized. Moreover, the mechanism of water turbidity connected with the hydrodynamics of the reservoir and the diversity of the sources of the suspended load supply was analysed. The research results show that the course of water turbidity in the upper, i.e. the river part of the reservoir depends on the conditions of the suspended load delivery by the river. In the lower part of the reservoir, i.e. the lake one, the concentration of the suspended load and its features heavily depend on the hydrodynamic and sedimentation processes in the reservoir. 
Key words: dam reservoir, course of water turbidity, concentration of suspended load, composition of suspended load, grain size of suspended load

 

Jaromír Demek, Peter Mackovčin, Petr Slavík:
Rock pediments and bahada in the Frenštátská brázda Furrow (the Moravian-Silesian Carpathians, Czech Republic)
Geomorphologia Slovaca et Bohemica, 11, 2011, 1, 42 - 49.
3 figs., 1 tab., 25 refs.

The Frenštátská brázda Furrow is an intermontane depression in the central part of the hilly land of the Podbeskydská pahorkatina in the Moravian-Silesian Carpathians on the territory of the Czech Republic. The bottom of the Trojanovická brázda Furrow is composed of rock pediments inclined from the frontscarp of the Moravian-Silesian Beskids to the centre of the depression. Pediments level flysch rocks of the Godula development of the Silesian unit of the Outer group of nappes of the Moravian- Silesian Carpathians from Jurassic up to Oligocene age. The authors distinguished 3 levels of rock pediments. Parts of higher pediments are covered by sands and gravels of alluvial fans of preglacial age (Lower Pleistocene). The middle and the lowest pediments are mostly covered by Pleistocene sands and gravels of alluvial fans coalescing into a bahada. Pediments were formed by lateral erosion of the Lubina River and its tributaries springing from the mountains of the Moravian-Silesian Beskids, as suggested by A. Ivan (1987).
Key words: rock pediments, bahada, the Moravian-Silesian Carpathians