Title of article :
The dating of bedrock landslide reactivations using dendrogeomorphic techniques: The Mazلk landslide, Outer Western Carpathians (Czech Republic)
Author/Authors :
?ilh?n، نويسنده , , Karel and P?nek، نويسنده , , Tom?? and Du?ek، نويسنده , , Radek and Havl?، نويسنده , , Daniel and Br?zdil، نويسنده , , Rudolf and Ka?i?kov?، نويسنده , , Lucie and Hradeck?، نويسنده , , Jan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
13
From page :
1
To page :
13
Abstract :
Landslides predisposed by the anisotropy of flysch bedrock are typical features of mass movements affecting the Outer Western Carpathians. A dendrogeomorphic investigation involving an extensive dendrometric (n = 1680) survey and tree-ring analysis of 176 Norway spruce trees (Picea abies (L.) Karst.) was used to reconstruct the spatial and temporal activity of the Mazák landslide, situated in the highest part of the Czech Outer Western Carpathians. As revealed by geomorphic analysis and electrical resistivity tomography, the landslide is a translational medium-depth (< 30 m) bedrock feature originating at the intersection of inclined bedding planes with diagonal (NW–NNW striking) and longitudinal (NE striking) sets of joints and faults. Dendrometric data supported by correlogram analysis suggest the coincidence of landslide reactivations with the presence of diagonal pervasive bedrock fractures. A tree-ring analysis shows nine major landslide years (1929, 1940, 1949, 1960, 1972, 1980, 1985, 1997, and 2000) accompanied by six additional years with minor reactivations (1933, 1945, 1955, 1958, 1977, and 1996) during the past hundred years (1912–2011). Major growth reactions to landslide movements in the study site were demonstrated by the occurrence of reaction (compression) wood and by the abrupt suppression of growth. An analysis of climatological data shows that the most likely meteorological triggers of the landslide reactivations are summer precipitation (especially heavy rainfall events in July and August with total rainfall of > 200–300 mm per 10 days).
Keywords :
Dendrogeomorphology , Bedrock landslide , electrical resistivity tomography , Landslide recurrence , Meteorological triggers , Flysch Carpathians
Journal title :
CATENA
Serial Year :
2013
Journal title :
CATENA
Record number :
2254166
Link To Document :
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