Formation and Evolution of Moraine-Dammed (Periglacial) Lake Nurgan, Northwestern Mongolia

Pryakhina, Galina; Кашкевич, М. П.; Попов, С. В.; Rasputina, Valeria; Боронина, Алина Сергеевна; Ganyushkin, Dmitry; Агатова, А. Р.; Непоп, Р. К.

doi:10.15372/kz20210403

Cited by 3 publications

(1 citation statement)

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“…The retreat of mountain glaciers, currently occurring as a result of global climate change, leads to an increase in the area of mountain lakes and an increased risk of outburst of moraine dams [1,2]. Such processes have been observed in the Himalayas, the Altai, the Pamir, Tibet, the Cordillera Blanca region, Spitsbergen, and Iceland [1,[3][4][5][6][7]. One of the possible mechanisms for the outburst of moraine dams, along with overflowing over the crest, is the formation of a filtration channel (piping).…”

Section: Introductionmentioning

confidence: 99%

Modelling of a Lake Outburst as a Result of the Development of Piping

Pryakhina,

Rasputina,

Svirepov

2024

Water

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The retreat of mountain glaciers inevitably leads to an increase in the number of outburst moraine lakes. One of the possible mechanisms of moraine dam outburst along with overflow over the crest is the formation of a filtration channel in the body of the moraine dam (piping). An algorithm for calculating the outburst flood hydrograph, describing the development of a filtration channel in the body of a moraine dam and the subsequent formation of water overflow when the soil above the channel collapses, is proposed in this paper. Verification of proposed methodology was carried out on the basis of experimental data and published data of real outbursts. Satisfactory results verifying this methodology made it possible to use the proposed methodology for the calculation of the hydrograph of the outburst of Lake Bashkara in the Elbrus region, which occurred on 1 September 2017. It is shown that the simulation results are quantitatively comparable with the estimates obtained from field data: the time of water discharge through the channel was 16 min, the period of the outburst wave passage was 40 min, and the maximum discharge was 636 m3/s. Thus, the possibility of applying the proposed methodology for calculating the destruction of natural moraine dams has been demonstrated.

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Section: Introductionmentioning

confidence: 99%

Modelling of a Lake Outburst as a Result of the Development of Piping

Pryakhina,

Rasputina,

Svirepov

2024

Water

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Characteristics of the hydrological regime of the periglacial moraine lakes in the Altai

Pryakhina,

Rasputina,

Zelepukina

et al. 2024

Lëd i sneg

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In the last decade glaciers of Inner Asia have been shrinking with acceleration, and the number of glacial lakes has been growing significantly, including those with a high probability of outburst and high-water discharge. The hydrological regime of lakes in the Altai is understudied in comparison with lakes in other high mountain countries. The article is based on our extensive field material on hydrological and morphometric characteristics of moraine lakes collected in the Russian and Mongolian parts of the Altai Mountains and combined with the Earth remote sensing data. We have proposed detailed indicators (criteria) of transgressive, regressive and post-regressive stages of lake development. It allows allow to determine at a qualitative level at what stage a lake is at and to assess its further development. The characteristics of hydrological regime of Altai lakes at different stages of development are described for the first time. Based on the criteria proposed, the classification of glacial and moraine lakes in the Altai high mountains was carried out. It shows that at present most of the lakes are in the transgressive stage. Over the last 22 years, the number of lakes has increased significantly: on the territory of the North Chuya Ridge – from 28 to 60, on the South Chuya Ridge – from 39 to 73, on the Katun Ridge – from 57 to 89, on the territory of the Tavan-Bogdo-Ola massif – from 11 to 19, and on the territory of the Mongun-Taiga massif – from 8 to 11 lakes.

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Assessment of the explosion hazard of the Antarctic Oasis lake using a composite index based on territorial determinants

Pryakhina

Dmitriev

Chetverova

et al. 2022

ICIGIS

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Lake outbursts floods is belonging to the hydrometeorological hazards. They occur as a result of destruction of snow-ice or earth dams and are most typical for lakes of alpine and polar regions. Glacial lakes outbursts floods (GLOF) are widely spread on water bodies of Antarctic oases. Methods for GLOF’s hazard assessment include monitoring, component analysis, point-by-point estimates, etc.) often overestimate the degree of the GLOF’s hazard compare to the real situation. The article presents the first experience of using the method of constructing composite indices (CI) based on territorial determinants for assessing the GLOF’s hazard. The case study of using of CI on water bodies located in the Larsemann Hills Oasis (Brocknes Peninsula, East Antarctica) is presented in the article. The study is based on the incito data obtained by the authors and the archival materials of the Russian Antarctic Expedition (RAE) in 2008–2021, collected in the PAULAS database. The calculations of CI show that the results are generally consistent with the in-cito measurements. The results are presented as maps showing the degree of GLOF’s hazard and the most vulnerable sections of the routes connecting wintering stations to the airfield. The intervals of changes for most of the considered criteria, used for CI calculation, were determined by expert method, and, therefore, largely depended on the experience of researchers and their understanding of the natural processes. The future studies will be supposed to refine and possibly supplement the list of criteria. Nevertheless, in the conditions of shortage of water level field measurements, the considered method can be used to assess the GLOF’s hazard of poorly studied and unstudied water bodies not only of Antarctic oases, but also of high-mountain glacial lakes.

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Formation and Evolution of Moraine-Dammed (Periglacial) Lake Nurgan, Northwestern Mongolia

Cited by 3 publications

References 0 publications

Modelling of a Lake Outburst as a Result of the Development of Piping

Modelling of a Lake Outburst as a Result of the Development of Piping

Characteristics of the hydrological regime of the periglacial moraine lakes in the Altai

Assessment of the explosion hazard of the Antarctic Oasis lake using a composite index based on territorial determinants

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