Assessing the role of thermal erosion in channel deformation processes in rivers of permafrost zone
| Autor: | E. I. Debolskaya, I. I. Gritsuk, Oksana Maslikova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:GE1-350
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Water flow 0208 environmental biotechnology Freshet 02 engineering and technology Permafrost 01 natural sciences 020801 environmental engineering Flume Heat transfer Erosion Geotechnical engineering Sediment transport Channel (geography) Geology lcsh:Environmental sciences 0105 earth and related environmental sciences |
| Zdroj: | E3S Web of Conferences, Vol 163, p 01003 (2020) |
| ISSN: | 2267-1242 |
| Popis: | The study is focused on the deformations caused by the impact of water flow in a river channel composed of melt-able permafrost rocks. It is based on the results of laboratory and mathematical simulation. The results of numerical calculations are compared with data of laboratory and field observations. The study shows that a comprehensive and adequate model of river channel deformations should take into account not only ablation, but also other factors, including heat transfer in the soil, sediment transport, and bank slope collapses. Numerical experiments with an improved mathematical model, applied to long time intervals, have shown that the differences between the averaged deformations, calculated by a model of ablation alone, i.e., ignoring bank slope collapses and sediment transport, and a comprehensive model can be considerable. Experiments in a hydraulic flume were good enough to reproduce the effect of delayed collapse, consisting in nonsimultaneous impacts of channel-forming rock melting and a freshet. |
| Databáze: | OpenAIRE |
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