Wyniki wyszukiwania - BazTech

1

Slope relaxation following landslides in the Łososina River Basin, Beskid Wyspowy Mts., Poland

Gorczyca E.

Landform Analysis

|

2010

|

Vol. 14

3-11

EN

The paper presents results from a study of the functioning of slopes in conditions where the dynamic equilibrium has been upset and sliding has been followed by slope relaxation. The research was an attempt to analyze large-scale changes in slope morphology in the Łososina River basin in the Beskid Wyspowy mountain range caused by an extreme rainfall event in 1997. The enormous scale of the sliding process that occurred on the slopes of the Łososina basin provided an opportunity to study the role of mass movements in landform development in mountains of medium height. The paper attempts to summarize the rate and course of slope relaxation processes using geomorphological mapping done from 1997 to 2000. The study tested the hypothesis that following the occurrence of an extreme event, slope relaxation processes will slow down mass movement processes to the point where they stop acting on the slope, and ultimately a new set of slope development processes will emerge.

2

Czytelność budowy geologicznej na zdjęciach lotniczych na przykładzie zachodniej części Beskidu Wyspowego

Firlińska M.

Teledetekcja Środowiska

|

2009

|

T. 42

23--34

EN

The area under investigation described in this paper is located in the Outer Carpathians in the western part of Beskid Wyspowy mountain ridge, in the Rača Subunit of the Magura Nappe and partly in the area of Tectonic Window of Mszana Dolna. A purpose of the study was to use of aerial photographs for assessment of readability of geological structure of above mentioned area. There is a lot of factors that determine the readability of geological structure on air photos: scale of the photographs, kind of films and filters, treatment of negatives and positives, season and time of the day when the photos were taken. The following photo interpretation criteria were considered the greatest importance during interpretation of the geological structure: morphology, tone of the air photos, colour, objects‘ size and shape, image pattern and shade. Also a hydrographical network and vegetation cover were taken under consideration as they are strongly connected with the geology. A geological sketch was executed as a result of the study. The sketch was compared with geological maps. It turned out that there are a few geomorphological elements that could be recognised in air photos as valleys, mountain’ chains, rivers’ terraces and landslides. There was no problem with distinguishing such geological structures as: intersectional lines, lithology, bedding of rocks, faults, the boundary of the Magura Nape’s thrust. In some cases there was incompatibility between elaborated geological sketch and geological maps due to a way the map was prepared, dislocalization of an element on the geological map, and problems with an interpretation of the areas with an abundant vegetation.

3

The geomorphological effectiveness of extreme meteorological phenomena on flysch slopes

Gorczyca E.

Landform Analysis

|

2008

|

Vol. 6

15--27

EN

Extreme events tend to cause large-scale slope system changes. During the last ten years, a series of extreme meteorological events caused considerable transformation of the slopes and valleys in various parts of the Carpathian Mountains. This paper presents the geomorphological effects of extreme rainfall and thaw events on the slopes of two catchments: the lososina catchment (Beskid Wyspowy) and the Hoczewka catchment with an area around the Solinskie Lake (Bieszczady Niskie). The bulk of the discussion concerns a study carried out in the Lososina catchment after three separate extreme events that were followed by a considerable transformation of the slopes due to landsliding. The studies carried out in the Biesr.cr.ady Range, where a single extreme event produced only spatially limited effects, were mainly used for comparison. '[he disparity between the responses of the two slope systems was a result of differences between the systems themselves, including their geology, geomorphology and landslide record, and of the difference in the scale of the extreme events.

4

Records of the Late Glacial-Holocene palaeoenvironmental changes in landslide forms and deposits of the Beskid Makowski and Beskid Wyspowy Mts. area (Polish Outer Carpathians)

Margielewski W.

Folia Quaternaria

|

2006

|

nr 76

149-149

EN

In the Beskid Makowski and Beskid Wyspowy Mts., Polish Outer Carpathians, 23 peat-bogs of different ages, situated in landslide depressions (fen mountainous peat-bogs) were studied and dated. Mineral horizons, illuvial horizons and mineral covers were invesligated in the sediments of these peat-bogs. Deposition of mineral sediments was connected with the humid climatic phases in the Late Glacial and Holocene, during which delivery of allochthonous material to peat-bog basins took place. Climate changes are recorded in differing ways within the sediments, which were conditioned by the specificity of the depositional environment of particular peat-bog basins, which react differently to climatic changes and human impact. Detailed and complex investigations of peat-bog profiles were conducted including lithological descriptions (loss on ignition, grain size and peat analyses) and numerous radiocarbon datings, using samples mainly from the horizons of the lithological changes (as diagnostic). Complete palynological profiles were made for eight sections. These investigations have documented that the deliveries of mineral material to the peat-bog basins took place mainly during the humid climate phases in the Bolling and Allerod Interstadials, at the beginning of the Holocene (YD/PB) and the boundary of the PB/BO, at the boundary of the BO/AT phases and the beginning of the Atlantic Phase, at the end of the Atlantic Phase and at the beginning of the Subboreal Phase (ca 5.5-4.8 and ca 4.5-4.1 ka BP), in the Subboreal Phase ca 3.5-3.0 ka BP, at the beginning of the Subatlantic Phase (ca 2.4 -1.8 ka BP), in the 5-7th centuries, in the 10-11th centuries, and during the Little Ice Age. The recorded humid phases are correlated with phases of fluvial activity of the Upper Vistula River as well as with phases of climate moistening observed in various sediments' facies of Europe. The use of probability density function for statistical analysis of distribution of the radiocarbon dates of the landslides in the Carpathians (66 dates) and mineral horizons in the studied peat-bogs (93 selected, representative datings) makes possible the determination (in the BC/AD age) of the phases of intensification of slope processes, which took place: 14,600-14,400 BC; 11,500-11,100 BC; 10,100-9,700 BC; 9,200-8,600 BC; 7,700-7,200 BC; 6,400-5,600 BC; 5,000-4,400 BC; 3,900-3,400 BC; 2,800-2,600 BC; 2,200-2,000 BC; 1,700-1,300 BC; 800 BC-AD 0; AD 600-1,000; AD 1,200-1,400; and AD 1,600-1,800.