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Acta Horticulturae et Regiotecturae

The Scientific Journal for Horticulture, Landscape Engineering and Architecture

2 Issues per year

Open Access
Online
ISSN
1338-5259
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DETERMINANTS OF SLOPE STABILITY REDUCTION / DETERMINANTY ZNI ŽOVANIA STABILITY SVAHU

Dagmar Dobiašová / Jozef Streďanský / Lucia Tátošová
Published Online: 2013-12-13 | DOI: https://doi.org/10.2478/ahr-2013-0007

Abstract

The formation or activation of landslide movements in Podtatranska kotlina is quite common, as it is flysh and volcanic area. There is a high incidence of sandstones in this area. The sandstones crumble and weather, and this is the reason why the subsoil becomes unstable. The rainfall is accumulated, and there is a danger of soil sliding down. There was located groundwater level in the central part of the slope (in the height of 30 cm), and in some parts, the water accumulation occurred in the depression places on the landslide body. There were created small landslide lakes, where the water was held during the year. The slope was soaked and the erosion started to increase. The slope with its instability has pushed the construction of road that leads underneath the heel of the slope. Neglected and improper construction in areas of slope landslides has become a relatively common phenomenon. Stabilization measures are often made up only when real problem occurs. An anthropogenic activity usually starts this problem. This refers to deforestation, grassing or deformation of slope stability in the heel by improper construction. The landslide was not the first one in the area. In 1898, there was the first landslide, but it was not as intensive as this one. Retaining wall was the only one stabilization measure which was built in that time. It also had a drainage outfall. However, during the summer months in 2010, the stabilization measure was disrupted and cracked. This occurrence started after the slope separation and by the foremost pressure on the given wing wall. During our measurements, we found out that in that area, there was a loss of plant cover, erosion accrued and soil physical properties changed. Our aim is to show the seriousness of the situation and propose appropriate stabilizing measures.

Súhrn

Vysledky poukazali na nutnosť riešenia vzniknutej situacie, aby nedochadzalo k ďalšim odnosom pody a čoraz vyraznejšiemu narušovaniu svahu. Svah svojou nestabilitou tlači na cestnu komunikaciu a ta sa v dosledku tohto posobenia stava nefunkčnou. Faktorom zosuvu sa stala zmena obsahu vody, činnosť mrazu, zvetravanie hornin a zmeny vo vegetačnom poraste. Podľa rychlosti a mechanizmu pohybu možeme hovoriť o zosuvani, keďže sa jedna o rychli pohyb svahovych hmot pozdĺž šmykovej plochy. Dĺžka a širka zosuvu je proporcionalna, takže možme hovoriť o plošnom zosuve, a stupeň stabilizacie je aktivny. Povrch zosuvu je intenzivne rozčleneny a nesie stopy čerstvych pohybov. Pohyby sa periodicky opakuju vplyvom prirodnych faktorov. Znovuobnovenie ochranneho lesneho porastu nad hranicou nami pozorovaneho uzemia by malo tiež pozitivny vplyv, keďže na miestach kde sa lesny porast nachadza nedochadza ku žiadnym svahovym procesom. Ďalšim opatrenim by bolo v spodnej časti pozemku navratiť a znovu obnoviť podny kryt. Na spodnu časť časti pozemku by sme zvolili vysadbu drevin z rodu Salix, aby dokazali spravne hospodariť s nadmernymi hromadenim povrchoveho odtoku. Keby sa pozemok zalesnil a zatravnil, tak by došlo k jeho stabilizacii. Tiež by sa znižila hladina podzemnej vody, ktoru by odčerpavali dreviny.

Keywords : landslide; plant cover; stabilization measures; erosion

Kľúčové slová : zosuv pody; rastlinny porast; stabilizačne opatrenia; erozia

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About the article

Published Online: 2013-12-13

Published in Print: 2013-12-01


Citation Information: Acta Horticulturae et Regiotectuare, ISSN (Online) 1338-5259, DOI: https://doi.org/10.2478/ahr-2013-0007.

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