| 1. |
- Beylich, Achim, A., et al.
(author)
-
Experimental weathering of selected non-calcareous rock types under wet/moist conditions
- 2007
-
In: Zeitschrift für Geomorphologie. - 0372-8854. ; 51:1, s. 1-26
-
Journal article (peer-reviewed)abstract
- This experiment outlines chemical and physical weathering of selected non-calcareous rock types during the time between November 2002 and February/March 2004. Parallel series of rock specimens were placed in boxes and half covered by water. One set was exposed to different temperature amplitudes in a freeze room, i.e., a simulated periglacial environment, another set was placed outdoor in a temperature environment with a mean annual temperature of c. +6°C, and four samples were placed in an office with a temperature of 21°C ± 3°C throughout. Electric conductivity, ion composition and pH values of the water together with the resulting amount of debris were determined for all samples at the termination of the experiment. In addition the electric conductivity and the debris were noted at intervals during the experiment. All samples experienced chemical weathering and the Freeze room and the Outdoor samples also underwent physical weathering to various extent. Generally speaking the highest degree of physical weathering was found in the Freeze room samples, but the pattern was not consistent. The relative importance of chemical weathering on the other hand seems more related to rock type than to environmental conditions. In single cases there are hints to suggest quantitative dominance of chemical over physical weathering in the Freeze room series. A tentative relationship between weathering of the respective rock types and the landforms in the areas of their origin could be noted. In spite of the low sample number and simple investigation methods the results suggest that rates of chemical and physical weathering as well as their mutual importance is more complex than traditionally believed.
|
|
| 2. |
|
|
| 3. |
- Beylich, Achim A., et al.
(author)
-
Selection of critical key test catchments
- 2007
-
In: In: Beylich AA and Warburton J, eds. Analysis of Source-to-Sink-Fluxes and Sediment Budgets in Changing High-Latitude and High-Altitude Cold Environments: SEDIFLUX Manual, First Edition.. - Trondheim : Geological Survey of Norway.
-
Book chapter (other academic/artistic)
|
|
| 4. |
- Ridefelt, Hanna, et al.
(author)
-
56 years of solifluction measurements in the Abisko mountains, northern Sweden - analysis of temporal and spatial variations of slow soil surface movement
- 2009
-
In: Geografiska Annaler. Series A. Physical Geography. - : Informa UK Limited. - 0435-3676 .- 1468-0459. ; 91A:3, s. 215-232
-
Journal article (peer-reviewed)abstract
- Solifluction movement rates from 1952 to 2008 for the Abisko region, northern Sweden, have been compiled and analysed through correlation tests and multiple regression. The temporal analysis is based on two datasets (Lobe11 & gridAB and Line B) from Karkevagge. The dataset Lobe11 & gridAB show a strong correlation between movement rates and mean annual air temperature (MAAT) and MAAT is also identified as one of the significant contributing parameters in the multiple regression model. No significant correlations were found for the Line B dataset. The spatial analysis indicates generally higher movement rates in the western part of the region and at lower altitudes mainly between 700 and 900 m a.s.l., but the spatial variability is high. To reduce the influence of the temporal variation the data for the correlation tests of the spatial variations were divided into two parts: 1957 to 1980 and 1981 to 2008. The correlation analysis of the dataset 1957 to 1980 shows a significant negative correlation between annual average movement rates and permafrost probability and altitude. The dataset 1981 to 2008 shows a positive correlation between movement rates and wetness index. It is concluded that movement rates may increase with higher MAAT in the western part of the region (Karkevagge), the spatial variability of movement rates within the region is very high and that altitude (and/or permafrost) together with wetness index are the main controls on the regional spatial variation. The study highlights the limitations in establishing statistical relationships between movement rates and climate using data from different field empirical studies.
|
|
