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Geophysical Monitoring of Permafrost in Yakutia - Observation and Modellingтезисы доклада
- Авторы: Svet Milanovskiy, Velikin S., Petrunin A.
- Сборник: International Conference “Solving the puzzles from Cryosphere” : Program, Abstracts : Pushchino, Russia, April 15–18, 2019
- Тезисы
- Год издания: 2019
- Место издания: Москва
- Первая страница: 125
- Последняя страница: 126
- Аннотация: Regular water and energy supply in permafrost areas are vitally important conditions for inhabitants of the large North territories of Russia. Dam and flank shore stability is the key point for safety of reservoir (power pool, water supply, tailing pit, etc.). In permafrost areas stability of many engineering structures, including hydraulic work, associated with thawing - freezing process. Increasing thawing of Yedoma permafrost may have positive feedback for greenhouse effect when gases emitted to the atmosphere. The presence of artificial reservoirs in permafrost environment gives an additional effect for deeper thawing for active layer due to seepage development. Emergency situation of Hydro Unit we have when seepage occurs in permeable talik zone adjoining to reservoir or directly in dam body. Hydro Units are natural laboratory for the study the interactions between permafrost environment - hydrosphere - climate. We present results of long-term geophysical monitoring on hydro technical objects of Western Yakutia (Sitikan and Viluy Hydro units) and testing active layer thickness (ALT) area of near Svetliy settlement in Western Yakutia. Geophysical monitoring included Electrical Resistivity Tomography, Method of a Natural Field, Georadar, Seismic Profiling and Sounding. Down-hole observations included complex of logging studies - Thermometry, Resistance, Flow meter survey, Radio Wave Geo – Introscopy (RWGI). Ground level and down-hole geophysical survey focused on detecting thawing zones (talik) in dam, its flank and tail-water zone. Long-term geophysical monitoring shows up spatialtemporal permafrost evolution and talik development in the flank shore of Sitikan dam. Detecting of inflow zone and seepage velocity performed for rightbank contiguity of Vilyui HPS-1. Geophysical information was used for constructing reliable numerical models of interaction of human impact (Hydro units) on the system "PermafrostReservoir-Climate". We solve non-steady problem of heat-mass transfer in fractured-porous saturated frozen environment. Model analyzes conditions causing origin and development of talik near reservoir, such as air temperature variations, snow cover, seasonal change of water temperature in storage basin, permeability evolution in frozen soil and inner structure of frozen massif. Numerical evaluations of originating and development of talik-zones near the dam, performed for two cross-sections: normal and orthogonal to general direction of filtration flow (quasi 3D). Proposed model can be used for analyzing more complex situation.
- Добавил в систему: Милановский Святослав Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Первая страница | Titul__Puschino2019.doc | 156,0 КБ | 16 февраля 2021 [Svet_Milanovskiy] | |
| 2. | Полный текст | International Conference “Solving the puzzles from Cryosphere” PROGRAM ABSTRACTS | PushchinoPermafrost_ConferenceProgrammAbstracts2019_compres… | 2,8 МБ | 3 декабря 2019 [Svet_Milanovskiy] |