Bedrock geology and topography of the Lake Peipsi depression, eastern Estonia

Miidel, Avo; Noormets, Riko; Hang, Tiit; Flodén, Tom; Bjerkéus, Monica

doi:10.1080/11035890101231015

Cited by 12 publications

(18 citation statements)

References 3 publications

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“…The basin of L. Peipsi is a glacially eroded bedrock depression in Ordovician and Devonian rocks with transitional boundaries. The rather flat bedrock topography under the lake itself was discovered through seismic investigations (Miidel et al 2001). The surface tends to lower towards the central part (Fig.…”

Section: Bedrock Topographymentioning

confidence: 87%

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New Data on the Distribution and Stratigraphy of the Bottom Deposits of Lake Peipsi, Eastern Estonia

Hang¹,

Miidel²,

Kalm³

et al. 2001

Proceedings of the Estonian Academy of Sciences. Geology

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Section: Bedrock Topographymentioning

confidence: 87%

“…The following description of the geological structure of the lake depression is mainly based on the results of continuous seismic reflection profiling (Noormets et al 1998;Miidel et al 2001).…”

Section: Geological Settingsmentioning

confidence: 99%

New Data on the Distribution and Stratigraphy of the Bottom Deposits of Lake Peipsi, Eastern Estonia

Hang¹,

Miidel²,

Kalm³

et al. 2001

Proceedings of the Estonian Academy of Sciences. Geology

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“…As there is no existing bedrock topography map for the whole study area, we used different accessible published and unpublished sources to compile the digital bedrock topography model. Local and/or national bedrock maps of the Baltic countries (Meirons, Straume, & Juškevics, 1974;Miidel, Noormets, Hang, Floden, & Bjerkeus, 2001;Sliaupa, 2003;Tavast & Raukas, 1982), Poland (Ber, 2000), Belarus (Komarovsky, 2009;Mander, 1973;Valchik, Zus, Fedenya, & Karabanov, 1990) and Russia (Breslav, 1971;Isachenkov, 1982;Orlenok, 2002;Sammet, Suschenko, & Ekman, 1967;Tatarnikov, 2007), although compiled at very different times, provided the best available information. Often the original bedrock topography maps/sketches had a little or no geographic information and their geometric correction (registration) was required before it was possible to use the data within a geographic information system (GIS).…”

Section: Methodsmentioning

confidence: 99%

Thickness distribution of quaternary deposits in the formerly glaciated part of the East European plain

2014

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A thickness map of Quaternary deposits in the south-eastern sector of the last Scandinavian Ice Sheet (SIS) and in areas of Middle Pleistocene Moscow (Warthe) and the Dniepr (Drente) stages of the Late Saalian glaciation on the East European Plain is presented (Main Map). The map of the thickness and related statistics of the Quaternary deposits were calculated from the difference between the current digital terrain model and the bedrock surface topography model. The distribution of Quaternary deposits shows that 29% of the mapped territory has sediments less than 25 m thick, 16% more than 100 m and 1.2% more than 200 m. Within the SIS area, the thickness of sediments in the southern sector exceeds threefold the sediment thickness in the eastern flank. This difference is attributed to the bedrock depression in the south-east of the Baltic Syneclise rather than to glacial dynamics. The calculated average thickness of the sediments within the SIS area is ca 50 m, in the formerly glaciated area outside the LGM it is ca 61 m and outside the glaciated area ca 14 m. Our study confirms that, in formerly glaciated areas, the spatial distribution of sediments did amplify the differences in glacial bed topography with the exception of the southern and eastern flanks of the Moscow glaciation area where exceptionally thick Quaternary deposits have inverted bedrock depressions into elevated areas in recent terrain. We suggest that the map presented improves existing knowledge of this area by adding detail and thus contributing to the on-going development of numerical ice-sheet models.

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“…Lake Peipsi/Chudskoe is a large shallow lowland lake (surface area: 3555 km 2 ) formed during the most recent ice age (Weichselian) by over-deepening of meltwater valleys (Miidel et al, 2001). Its drainage basin (Figure 1) measures 45541 km 2 (excluding the lake area).…”

Section: Study Areamentioning

confidence: 99%

Changes in Nutrient Emissions, Fluxes and Retention in a North-Eastern European Lowland Drainage Basin

Mourad

Perk

Piirimäe

2006

Environ Monit Assess

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Despite dramatic reductions in the 1990s of N and P emissions in the drainage basin, Lake Peipsi/Chudskoe (Estonia/Russia) is still suffering from algal blooms, probably caused by low N:P ratios of the lake water. To quantify the sources and changes of N and P inputs to the lake as a result of economic changes, we modelled emissions, transfer and in-stream retention using a GIS model. The model was calibrated using river monitoring data from the 1985-1989 period, and used to simulate emissions and loads for five future scenarios for 2015-2019. During the 1985-1999 period, diffuse P emissions decreased relatively more than N diffuse emissions, but this was not reflected in the loads to the lake. P loads decreased relatively less than N loads, which caused a decrease in the N:P ratio of the rivers. About 30-45% of diffuse N emissions and only 3-10% of diffuse P emissions reaches the river network. In-stream retention reduces N and P loads to the lake by about 62% and 72%, respectively. Point sources contribute negligibly to the N load to the lake, but form about one-third of the P load. A target/fast development scenario is the most likely scenario for the 2015-2019 period, resulting in higher nutrient loads than in recent years. We conclude that effective load reductions can be achieved by focussing on diffuse N and P emissions close (< 50 km2) to the lake and by upgrading P removal capacity in wastewater treatment plants of towns.

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Bedrock geology and topography of the Lake Peipsi depression, eastern Estonia

Cited by 12 publications

References 3 publications

New Data on the Distribution and Stratigraphy of the Bottom Deposits of Lake Peipsi, Eastern Estonia

New Data on the Distribution and Stratigraphy of the Bottom Deposits of Lake Peipsi, Eastern Estonia

Thickness distribution of quaternary deposits in the formerly glaciated part of the East European plain

Changes in Nutrient Emissions, Fluxes and Retention in a North-Eastern European Lowland Drainage Basin

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