Geomorphologia Slovaca et Bohemica   
JOURNAL ABOUT CONTEPORARY GEOMORPHOLOGIC PROBLEMS
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Geomorphologia Slovaca et Bohemica
2/2013

Content/Obsah

VERONIKA STAŠKOVANOVÁ: 
Modelovanie vývoja pohoria Tribeč prostredníctvom Channel hillslope integrated landscape development model (CHILD)
   
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JURAJ PROCHÁZKA:
Pôdorysná vzorka riečneho koryta dolného Váhu, Nitry a Dudváhu s osobitým zreteľom na vplyv faktora tektoniky 
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DANIEL KUBINSKÝ - JAKUB FUSKA - KAROL WEIS - MILAN LEHOTSKÝ - JOZEFÍNA POKRÝVKOVÁ:
Zmeny reliéfu dna a akumulačného objemu umelej vodnej nádrže a intenzita jej zanášania za ostaných 125 rokov – príklad Veľkej Richňavskej 
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MILAN LEHOTSKÝ - ŠÁRKA HORÁČKOVÁ - JÁN SLÁDEK:
Morfologicko-sedimentologické zmeny by-pasovaného koryta vodného toku – príklad starého koryta Dunaja 
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SPRAVODAJCA ASG PRI SAV 2013
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Abstracts/Abstrakty

Veronika Staškovanová:
Modelling of landscape evolution of the Tribeč Mts. by the channelhillslope integrated landscape development model (CHILD)
Geomorphologia Slovaca et Bohemica, 13, 2013, 2, 7 - 18.
6 figs., 2 tabs., 28 refs.

Numerical models have been developed that simulate the evolution of fluvial terrain as a consequence of different geomorphologic processes. In Slovakia, however, progress in the numerical expression of fundamental geomorphological process theory was limited, so that models have not been yet widely used. The Channel-Hillslope Integrated Landscape Development (CHILD) model was used to create a simulation for the Tribeč Mts., because CHILD overcomes many of the limitations of the previous generation of models and provides a suitable computational framework for exploring research questions related to long-term landscape evolution. However, the number of parameters in the model is potentially quite large, its modular structure leads to carefully selecting of process equations. It requires a good theoretical knowledge of mathematical expression of the processes included and accurate quantitative data about the study area. Despite limitations, the CHILD model provides an appropriate working tool for simulations testing hypotheses about landscape evolution.
Key Words: landscape evolution, CHILD model, numerical expression of geomorphic processes, Tribeč Mts., landscape simulation

 

Juraj Procházka:
Planform of the lower Váh River, the Nitra River and the Dudváh River channels with particular consideration on influence of tectonics factor
Geomorphologia Slovaca et Bohemica, 13, 2013, 2, 19 - 30.
7 figs., 1 tab., 29 refs.

The aim of this work is to demonstrate the influence of tectonics on the lowland rivers pattern differentiation. Change of river patterns of the Váh River, the Nitra River and the Dudváh River in longitudinal direction can be studied by sinuosity index. Parameter of river channel sinuosity is determined by channel gradient. This is influenced by relative neotectonic movements on boundary lines of two blocks. It is necessary to study the state of river channel pattern before anthropogenic interventions. We detected, that the first important interventions on river Váh channel took place already in the 18th century, therefore it is eligible to use the First military survey of Habsburg Empire instead of the Second military survey, which was used in some other studies. River reaches with the most outstanding sinuosity reflect also the boundaries of geomorphological units (plain and hillyland) and regional depressions, which are controlled by faults.
Key words: sinuosity of river channel, neotectonics, historical maps, anthropogenic river regulation

 

Daniel Kubinský, Jakub Fuska, Karol Weis, Milan Lehotský, Jozefína Pokrývková:
Changes of the bottom relief and accumulation volume of an artificial water reservoir and intensity of its silting for the last 125 years. Example of Veľká Richňava
Geomorphologia Slovaca et Bohemica, 13, 2013, 2, 31 - 40.
6 figs., 2 tabs., 29 refs.

The aim of the study was the analysis of elevation and volume changes in the bottom of water reservoir Veľká Richňavská based on comparison of situations in 1888 and 2013, i.e. after 125 years. Changes of the bottom elevation of this reservoir were identified based on comparison of bathymetric data from the historical map from 1888 with the present data (2013) obtained by the geodetic field survey. Processing of all data has been executed in the GIS environment. Volume of sediments was computed using the bottom models for two time horizons, 1888 and 2013. Results have shown that in 125 years 110,494 m3 of sediments were deposited. It represents the diminishment of the accumulation volume of the reservoir by 14.22 % and the speed of siltation ranges between 31.9 and 15.5 mm year-1. The research also comprised detection of LC types in the bank zone as indicators of possible supply of sediments to the reservoirs. LC types were identified using the data obtained from aerial survey photos (1949) and orthophotomaps from 2006 updated for 2013. Analysis of changes in areas of LC types indicates increase of categories strongly supporting abrasion of banks, speed of supply and transfer of sediments to the reservoir (by 5121 m2), and increased amount of organic matter in the reservoir.
Key words: artificial water reservoir, bottom relief, accumulation volume, rate of silting, ultrasonic measurement, riparian zone

 

Milan Lehotský, Šárka Horáčková, Ján Sládek:
Geomorphic-sedimentary changes of a by-passed channel: Case study of the old Danube River channel
Geomorphologia Slovaca et Bohemica, 13, 2013, 2, 41 - 49.
9 figs., 3 tabs., 9 refs.

The by-passed reach of the old Danube channel gives a very good example of the human impact on a river system. Decreasing discharge and the disconnectivity in sediment fluxes condition the granulometric change in the vertical accretion stratigraphy which by the negative feedback due to vegetation succession initiates changes in land cover structure. The scroll bar as it could been seen in 1992 has been developed into new form of floodplain – floodplain pocket. Its morphological differentiation is determined by vertical accretion, i. e. by the input and spatially variable deposition of suspended load during “new” flood regime of the old Danube channel. The fact that from 1992 more than 1 m thick layer of sediments has been deposited and most of bar area is covered by the floodplain forest the investigation of the other six floodplain pockets downstream is highly topical. Apart from the study of their geomorphic- sedimentary properties and examination of decrease in floodway capacity of the old Danube channel the floodplain roughness investigation is required.
Key words: by-pass, floodplain pocket, scroll-bar, vertical accretion, landforms mapping, granulometry, old Danube River channel