Petrographic composition and directional properties of tills on the NW surroundings of the Gdańsk Bay, Northern Poland

Woźniak, Piotr Paweł; Czubla, Piotr; Wysiecka, Grażyna; Drapella, Małgorzata

doi:10.2478/v10056-009-0007-z

Cited by 11 publications

(21 citation statements)

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“…The TBC of the upper subunit is skewed to the southwest with respect to the TBC calculated for the lower subunit. A similar situation has previously been documented at Kartoszyno, located further to the west of the Gulf of Gdańsk (Woźniak et al, 2009). This change of petrographic composition is consistent with the observed changes in the till fabric in sections at Babie Doły (Fig.…”

Section: Discussionsupporting

confidence: 84%

“…In this series there is also a shear system accompanying the dominant sector. The orientation ; to obtain an image that is consistent with results of previous studies (inclusive of Woźniak et al, 2009;Woźniak & Czubla, 2015), the co-ordinates of the TBC shown in the figure were based on indicator erratics and the expanded group of auxiliary erratics, including certain types of calcareous rocks (see Czubla, 2001); different styles of arrows indicate various shift directions of the TBC location of the upper subunit of the till in relation to the one calculated for the lower subunit.…”

Section: Till Fabricsupporting

confidence: 54%

“…In areas of potential activity of ice streams (surely including the region of the Gulf of Gdańsk), ice sheet dynamics, however, could have been characterised by a very high temporal and spatial variability. This is expressed as a large variation of directions from which the ice flowed, recognised at sites along the north-western vicinity of the Gulf of Gdańsk (compare Woźniak et al, 2009;Woźniak & Czubla, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…This means that the source area of erratics shifted only slightly to the east and remained in the onset zone of the Vistula palaeo-ice stream. At sites located along the northwesterly edge of the Gulf of Gdańsk (Babie Doły and Kartoszyno) there is a clear shift in source area of erratics (compare Woźniak et al, 2009). The TBC location of the upper subunit is shifted towards the southwest in relation to the lower one.…”

Section: Discussionmentioning

confidence: 99%

“…Throughout almost the entire period noted they remained under the ice sheet, irrespective of changes in extent, further south marked by fluctuations of the ice sheet margin (Marks, 2012;Wysota et al, 2009). The effect of this is the development of a single till bed representing glacial sedimentation throughout the Late Weichselian (Woźniak et al, 2009;Woźniak & Czubla, 2015). This till bed can be used to study the record of changes in ice sheet dynamics, directions of debris transport and conditions of sedimentation.…”

mentioning

confidence: 99%

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Unravelling the complex nature of the Upper Weichselian till section at Gdynia Babie Doły, northern Poland

Woźniak

Czubla

2016

Geologos

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The complexity of glacial sequences may increase when these formed underneath ice sheets despite subsequent changes in their extent that are accompanied by alterations in the direction of the ice flow. Our aim was to determine whether or not changes in ice sheet dynamics during the Late Weichselian are also recorded in sediments formed north of the area of its fluctuating margin (i.e., where the ice sheet prevailed independent of such fluctuations). It is shown that in these areas such a record could have occurred, as documented by results of till studies at Babie Doły. The examination was carried out using several analyses: lithofacies properties of sediments, petrographic till composition (fine gravel fraction, indicator erratics), till matrix CaCO3content, till fabric, as well as orientation of striae on the top surfaces of large clasts. In parallel, datings of sub- and supra-till sediments using the TL method were carried out. The basal till at Babie Doły represents almost the entire Upper Weichselian, but it can be divided into subunits whose features indicate different ice flow directions and debris supply. The lower subunit developed as a result of the palaeo-ice stream along the main axis of the Baltic Sea (from the north), expanding to areas adjacent to the depression of the Gulf of Gdańsk. The upper subunit developed when the influence of the palaeo-ice stream in the study area decreased, the main role having been taken over by the ice flowing from the northwest. The till analysed also shows considerable lateral variation, indicative of the mosaic nature of subglacial sedimentation. We consider the diversity of permeability of deposits over which the ice sheet extended to be the prime factor that determined such a situation.

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Section: Discussionsupporting

confidence: 84%

Section: Till Fabricsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Unravelling the complex nature of the Upper Weichselian till section at Gdynia Babie Doły, northern Poland

Woźniak

Czubla

2016

Geologos

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Landslide susceptibility mapping of Gdynia using geographic information system-based statistical models

Małka

2021

Nat Hazards

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This work aims to prepare a reliable landslide susceptibility model and to analyse the factors contributing to landslides in a dynamic environment by considering the city of Gdynia, Poland as a case study. Geological, geomorphological, hydrological, hydrogeological, and anthropogenic predisposing factors are considered using geographic information systems. Ground types at different depths (1 m and 4 m b.g.l.) are used in the statistical susceptibility assessment for the first time. Landslide susceptibility maps are developed using two techniques in presenting landslides, 13 conditioning factors, and three statistical methods: landslide index, weight of evidence, and logistic regression. The considered factors have an influence on mass movement formation, but their roles are different. Many of these passive factors are interrelated and some of them are also related to active factors, i.e. triggers. Consideration of many thematic layers in the statistical approach allows for the selection of the most appropriate geo-environmental variables. The most significant conditioning factors that affect the likelihood of landsliding include land use and land cover as well as topography. The susceptibility maps generated by the index model and many interrelated passive factors appear to be over-predicted. The logistic regression model and only independent controlling factors (slope angle, slope aspect, and lithology) are sufficient to compile a reliable susceptibility map of Gdynia. Prediction rate curve plots show that the susceptibility map produced using logistic regression exhibits the highest prediction accuracy. The results emphasize the need to check independence in the selection of instability factors and the use of an independent subset of landslides for validation.

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Debris flows with soft-sediment clasts in a Pleistocene glaciolacustrine fan (Gdańsk Bay, Poland)

Woźniak

Pisarska‐Jamroży

2018

CATENA

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Petrographic composition and directional properties of tills on the NW surroundings of the Gdańsk Bay, Northern Poland

Cited by 11 publications

References 4 publications

Unravelling the complex nature of the Upper Weichselian till section at Gdynia Babie Doły, northern Poland

Unravelling the complex nature of the Upper Weichselian till section at Gdynia Babie Doły, northern Poland

Landslide susceptibility mapping of Gdynia using geographic information system-based statistical models

Debris flows with soft-sediment clasts in a Pleistocene glaciolacustrine fan (Gdańsk Bay, Poland)

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