Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians)
The valley of the upper course of the San River in the Bieszczady Wysokie mountain range is, after the Orawa-Nowy Targ Basin, the area with the largest number of peat bogs in the Polish Carpathians. This study combined a levelling survey with data from dense networks of boreholes on two riparian bog...
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| Format: | Article |
| Language: | English |
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International Mire Conservation Group and International Peatland Society
2020-04-01
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| Series: | Mires and Peat |
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| Online Access: | http://mires-and-peat.net/media/map26/map_26_12.pdf |
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| author | J. Kukulak M. Szubert |
| author_facet | J. Kukulak M. Szubert |
| author_sort | J. Kukulak |
| collection | DOAJ |
| description | The valley of the upper course of the San River in the Bieszczady Wysokie mountain range is, after the Orawa-Nowy Targ Basin, the area with the largest number of peat bogs in the Polish Carpathians. This study combined a levelling survey with data from dense networks of boreholes on two riparian bogs (Łokieć and Dźwiniacz) in the Bieszczady Mountains (East Carpathians) to characterise the morphology of the two peatlands, create a digital elevation model (DEM) for Łokieć, and describe the underlying sediments. Previous radiocarbon dating of basal peat samples has indicated that both peat bogs began to grow during the younger part of the Holocene, but not at the same time. The results of the coring undertaken in our study demonstrated that both bogs fill 0.5–1.5 m deep troughs cut into a fluvial terrace situated 4–6 m above the level of the San River. The bog domes are asymmetrical, more than 2 m high, and their summits lie directly above the deepest parts of the troughs. The troughs are lined by sediments of mainly fluvial origin (silt, sand, fine gravel), and in their deepest parts the peat lies directly on clays originating from weathering of shales in the terrace base. On this basis, the troughs are interpreted as palaeochannels (infilled oxbows) representing fragments of the ancient San River channel, cut off by erosion and situated at the former level of the valley bottom. Raised bogs seldom occur in mountain valleys, where reworking of floodplain deposits proceeds at a higher rate and peatlands are frequently eroded by fluvial action. The two bogs that we studied in the Bieszczady Mountains are exceptional in that they are set in preserved palaeochannels. |
| first_indexed | 2024-03-12T07:45:53Z |
| format | Article |
| id | doaj.art-7efce03f29104b15a9d6760fc184fc6a |
| institution | Directory Open Access Journal |
| issn | 1819-754X |
| language | English |
| last_indexed | 2024-03-12T07:45:53Z |
| publishDate | 2020-04-01 |
| publisher | International Mire Conservation Group and International Peatland Society |
| record_format | Article |
| series | Mires and Peat |
| spelling | doaj.art-7efce03f29104b15a9d6760fc184fc6a2023-09-02T21:01:03ZengInternational Mire Conservation Group and International Peatland SocietyMires and Peat1819-754X2020-04-01261211310.19189/MaP.2019.OMB.StA.1750Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians)J. Kukulak0M. Szubert1Institute of Geography, Pedagogical University of Kraków, Kraków, PolandInstitute of Geography, Pedagogical University of Kraków, Kraków, PolandThe valley of the upper course of the San River in the Bieszczady Wysokie mountain range is, after the Orawa-Nowy Targ Basin, the area with the largest number of peat bogs in the Polish Carpathians. This study combined a levelling survey with data from dense networks of boreholes on two riparian bogs (Łokieć and Dźwiniacz) in the Bieszczady Mountains (East Carpathians) to characterise the morphology of the two peatlands, create a digital elevation model (DEM) for Łokieć, and describe the underlying sediments. Previous radiocarbon dating of basal peat samples has indicated that both peat bogs began to grow during the younger part of the Holocene, but not at the same time. The results of the coring undertaken in our study demonstrated that both bogs fill 0.5–1.5 m deep troughs cut into a fluvial terrace situated 4–6 m above the level of the San River. The bog domes are asymmetrical, more than 2 m high, and their summits lie directly above the deepest parts of the troughs. The troughs are lined by sediments of mainly fluvial origin (silt, sand, fine gravel), and in their deepest parts the peat lies directly on clays originating from weathering of shales in the terrace base. On this basis, the troughs are interpreted as palaeochannels (infilled oxbows) representing fragments of the ancient San River channel, cut off by erosion and situated at the former level of the valley bottom. Raised bogs seldom occur in mountain valleys, where reworking of floodplain deposits proceeds at a higher rate and peatlands are frequently eroded by fluvial action. The two bogs that we studied in the Bieszczady Mountains are exceptional in that they are set in preserved palaeochannels.http://mires-and-peat.net/media/map26/map_26_12.pdfdigital elevation model (dem)lithologyoxbow lakespeatlandspolish outer carpathians |
| spellingShingle | J. Kukulak M. Szubert Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) Mires and Peat digital elevation model (dem) lithology oxbow lakes peatlands polish outer carpathians |
| title | Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) |
| title_full | Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) |
| title_fullStr | Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) |
| title_full_unstemmed | Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) |
| title_short | Substratum sedimentology and topography of two riparian peat bogs in the Bieszczady Mountains (Carpathians) |
| title_sort | substratum sedimentology and topography of two riparian peat bogs in the bieszczady mountains carpathians |
| topic | digital elevation model (dem) lithology oxbow lakes peatlands polish outer carpathians |
| url | http://mires-and-peat.net/media/map26/map_26_12.pdf |
| work_keys_str_mv | AT jkukulak substratumsedimentologyandtopographyoftworiparianpeatbogsinthebieszczadymountainscarpathians AT mszubert substratumsedimentologyandtopographyoftworiparianpeatbogsinthebieszczadymountainscarpathians |