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Small slope tilts caused by meteorological effects and vital processes of trees on a wooded slope in Hidegvíz Valley, Hungary

Mentes, Gyula and Bódis, Virág Bereniké and Vig, P. (2014) Small slope tilts caused by meteorological effects and vital processes of trees on a wooded slope in Hidegvíz Valley, Hungary. GEOMORPHOLOGY, 206. pp. 239-249. ISSN 0169-555X

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Abstract

Long-term measurements were carried out to investigate the relationship between ground tilts and variations of meteorological (temperature, precipitation) and hydrological (soil moisture content) parameters in the area of the Sopron Mountains, on a wooded slope of the Hidegvíz Valley. The connection between surface tilts and the vital processes of the trees was also studied on the basis of the reference evapotranspiration calculated for the study area. Long-and short period variations were separated. A long-period ground temperature change of 1 °C caused a 4 µrad tilt in the SE direction. Short-period temperature effects can be neglected. The fluctuation of the temperature around the freezing point causes tilts of about 10 µrad °C–1 . The soil water content variation has the largest effect on the ground tilt (0.5 µrad mm–1 ). Its contribution to the total ground tilt in the investigated period was about 70 µrad (65% of the total tilt of 107 µrad) toward the SSE. The contribution of the wind speed to the ground tilt is about 20 µrad m s–1 toward the SSE depending on the water content of the soil. The wind does not causes a permanent ground tilt. The magnitude of the daily tilt variations in the active growing period of trees, from March to October, is 1–2 µrad while in the dormant period (with no canopy) the tilt variations are less than 0.4 µrad. The admittances between the evapotranspiration and the ground tilts are 0.3–0.5 µrad mm–1 and 0.1–0.2 µrad mm–1 in the active and dormant period of the trees, respectively. These small effects superimposed on each other can significantly contribute to slope failures. The results of this study provide information which can be useful in the modelling of landslide movements and for the mitigation of landslide hazards.

Item Type: Article
Subjects: G Geography. Anthropology. Recreation / földrajz, antropológia, kikapcsolódás > GA Mathematical geography. Cartography / földméréstan, geodézia, térképészet
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 25 Apr 2014 15:54
Last Modified: 25 Apr 2014 15:54
URI: http://real.mtak.hu/id/eprint/11519

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