Surface changes on a landslide affected high bluff in Dunaszekcső (Hungary)

Abstract

This article presents results from the survey conducted on Dunaszekcső loess bluff after the last major rotational sliding event in 2008. The study area is a region of 25×30 m located on loess bluff close to the recent scarp. The relative elevation change of the surface was surveyed in 2.5×5 m grid network in relation to a marked base point. The survey was conducted using simple equipment such as analogue theodolite and leveller with regular time interval during a year and control measurements were taken after six months. It was assumed that measurements to the nearest cm are sufficient to recognize vertical displacements of the surface. The study focused on identifying the pattern of general vertical movements for the study area by the relative movements of individual points. Our results show significant cm scale vertical displacements. Most of the grid points have a slow decreasing tendency, but close to the scarp a more significant displacement was found. The main character of the spatial pattern is subsidence, which is more definitive on southern part of the study area than the northern part. Our observations correlate with the broader geomorphological characteristics of loess bluffs along the Danube.

How to avoid false interpretations of Sentinel-1A TOPSAR interferometric data in landslide mapping? A case study: recent landslides in Transdanubia, Hungary

“…1) are known to be permanently active. Despite the significant economic losses caused by mass movements, few local monitoring networks have been established here (Újvári et al 2009;Bugya et al 2011;Bányai et al 2014). Although the first PS tests by Del Ventisette et al (2013) were successful at Rácalmás, spaceborne monitoring of other high bluffs has not yet been attempted.…”

“…As the test sites have been investigated in detail over the last decades by numerous authors, maps and published displacement data have also been used to identify possible displacement zones. The geomorphologic map of the town of Komló (CSK); 1 = valley, 2 = ridges 3 = slopes, 4 = closed coal mine, 5 = andesite quarry, 6 = mine dumps, 7 = residential areas, 8 = railway, 9 = road The general geomorphologic properties of the test sites, published data (Bugya et al 2011;Del Ventisette et al 2013;Kovács et al 2015) and maps (Scheuer 1979;Fodor et al 1983;Lovász and Nagyváradi 1997) were checked by field observations and represented on geomorphologic maps (Figs. 2,3,4).…”

Recurrent landsliding of a high bank at Dunaszekcső, Hungary: Geodetic deformation monitoring and finite element modeling

“…In 2008, a large landslide occurred at Dunaszekcső (Újvári et al, 2009) and during the subsequent years the movements spread towards the south (Fig. 1), thereby threatening numerous houses, private properties and infrastructures (Bugya et al, 2011;Mentes et al, 2012). GPS measurements and precise leveling campaigns were commenced in 2007 and these datasets were complemented with continuous tilt recordings.…”

Linking vegetation and mass movements on the high bluff at Paks-Dunakömlőd

“…У долинах угорських річок, таких як Гернад, Раба чи Дунай, найхарактернішими є зсуви, осипи та обвали берегів. На південь від Будапешту, безпосередньо на підмитих, активних правих берегах р. Дунай, принаймні на шести ділянках -Ерд, Ерчі, Кульч-Дунауйварош, Дунафельдвар-Бельчке, Дунакем-лед-Пакш і Бата-Могач -існує загроза зсувів [3,5]. Упродовж пізнього плейстоцену й голоцену, внаслідок латеральної бічної ерозії Дунаю утворилася берегова стінка приблизно 20-60 м висотою, що складається, в основному, серією лесових палеогрунтів [1,14].…”