Dendrogeomorphology review and new techniques of tree ring dating

03-May-2020 00:29 by 10 Comments

Dendrogeomorphology review and new techniques of tree ring dating

The study area is located in the Kamienne (Stone) Mountains, a range in the centre of the Sudetes Mountains, Central Europe (Fig. This area is known for the widespread occurrence of landslide-affected terrain, apparently of different ages (Migoń ., 2013). is composed of igneous and sedimentary rocks of late Carboniferous and early Permian age (Awdankiewicz, 1999; Fig. The former comprise both extrusive and sub-volcanic bodies of rhyolite, trachyandesite, and rhyolitic tuff, which overlie or intrude sedimentary packages of sandstones, mudstones and claystones.Juxtaposition of rigid volcanic rocks and competent sedimentary rocks, along with significant local topographic relief, sets the stage for slope instability.

In the long-term, however, even such a subtle mass transfer may become significant for both the evolution of hillslopes and hazard and risk assessment.For example, values as low as 534 mm in 1982 and as high as 977 mm in 2007 were recorded.Within the 30-year period of observations, the monthly rainfall in summer (May September) exceeded 100 mm in 36 instances, occasionally rising above 250 mm.Mean slope angles fall within the range of 20–40°, and locally thin regolith-covered slopes are as steep as 60°.Except for footslope settings, slopes in the area carry a rather shallow regolith cover, less than 2 m thick (Migoń ., 2013).The Kamienne Mountains are situated in the humid temperate zone, with a mean annual temperature around 5.5°C.

Mean annual precipitation at the nearby weather station in Mieroszów operated by the Institute of Meteorology and Water Management in Wrocław (IMGW), was 776 mm in the period 1977–2007, although the amount of rainfall varied considerably from year to year.

Slow displacements can be deep-seated or recorded in the near surface layer (Peyret a) Trees tilted and fallen during a single, abrupt landslide event on Girova Mt in 2010 (Western Carpathians, Czech Republic), b) Trees tilted upslope by slow movement of the Suchawa landslide and showing the pattern of upslope eccentricity developed in a spruce tree (Picea abies Karst.) tilted upslope.., 2013; Grana and Tommasi, 2014).

Dendrochronology provides another method, with the advantage that this usually covers a longer time period than any of the instrumental methods.

In this approach, changes in wood anatomy of trees growing on landslide-affected slopes are analyzed and interpreted in terms of external disturbance induced by slope instability (., 2013).

Trees are very sensitive indicators of landsliding.

Prices in € represent the retail prices valid in Germany (unless otherwise indicated). Prices do not include postage and handling if applicable. We found ubiquitous evidence of ongoing slope instability by analysing the variability of tree-ring eccentricity index in trees growing on three apparently relict landslide slopes in the Sudetes (Poland, Central Europe).