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Wave structures in the ice field and influence of them on the strength of salt ice
https://doi.org/10.31857/S2076673420040066
Abstract
The heterogeneity of the strength of the ice field of the dynamic type of formation with an area of 800 m2 was investigated in time and space. It is shown that stationary periodic wave structures are formed in a closed volume of an ice field lying on the surface of a liquid in a rectangular basin. In a case of absence of any external influences, the dominant source of elastic waves in the ice is the coherent radiation of them on freezing of water, i.e. the ice field itself. Another wave structures, i.e. standing waves, form secondary ice textures in the ice field with diminished strength. Local hardness of ice was chosen as the criterion of strength. The recurrence of local hardness values as a function of coordinates of the measurement points in the longitudinal and transverse profiles of the ice field was determined. The hardness values vary from 40 to 60% with an axial force measurement error of 5%. The experimental relations are approximated by periodic curves, in which the maxima and minima of local hardness correlate with the nodes and antinodes of standing waves, respectively. The decrease in local ice hardness in the secondary textures is explained by high-frequency dynamic metamorphism. The wavelengths corresponding to bending-gravitational and longitudinal waves are identified, with the interference of which stationary periodic wave structures are formed. A similar regularity of changes in local hardness was revealed also in a river ice. The results obtained allow us to consider nonlinear wave phenomena as one of the factors controlling the spatial-temporal variability of the ice strength characteristics.
About the Authors
V. P. EpifanovRussian Federation
Moscow
K. E. Sazonov
Russian Federation
St.Petersburg
References
1. Kheysin D.Ye. Ice cover dynamics. Mekhanika i fizika ledyanogo pokrova. Mechanics and physics of ice cover. M: Nauka, 1983: 152–163. [In Russian].
2. Bukatov A.Ye. Compression waves in ice cover. Volnovyye dvizheniya zhidkosti: teoriya i eksperimenty. Wave motion of a fluid: theory and experiments. Geofizika. 1985, 10: 24–32. [In Russian].
3. Gavrilo V.L., Tripol'nikov V.P. The results of the study of flexural-gravitational resonance in sea ice. Teoriya i prochnost' ledokol'nogo korablya. The theory and strength of an icebreaker ship. Gor'kiy: GPI, 1982: 28–34. [In Russian].
4. Kozin V.M. Rezonansnyy metod razrusheniya ledyanogo pokrova. Izobreteniya i eksperimenty. Resonant destruction method. Inventions and experiment. M.: Akademiya Yestestvoznaniya. 2007: 355 p. [In Russian].
5. Еpifanov V.P. The effect of stress pulses on the structure of ice in the intermediate layer. Doklady Akademii Nauk. Reports of the Academy of Sciences. 2018, 479 (6): 629–633. [In Russian].
6. Denisov V. I., Sazonov K. E., Timofeev O. Ya. New experimental capabilities of the Krylov State Scientific Center for the study of ice impacts on objects of marine technology. Arktika: ekologiya i ekonomika. Artika: ecology and economics. 2015, 3 (19): 76–81. [In Russian].
7. Cherepanov N.V. Classification of ice in natural reservoirs. Trudy Instituta Arktiki i Antarktiki. Proc. of AARI. 1976, 331: 77–99. [In Russian].
8. Epifanov V.P. The influence of natural factors on the morphology of snow cover. Vestnik Kol'skogo nauchnogo tsentra RAN. Bulletin of the Kola Science Center RAS. 2018, 3 (10): 155–162. [In Russian].
9. Kheysin D.Ye. To the problem of elastic-plastic bending of the ice cover. Trudy Instituta Arktiki i Antarktiki. Proc. of AARI. 1964, 267: 143–149. [In Russian].
10. Epifanov V.P. Nesterov S.V. Electromagnetic emission as a method of quantitative studies of ice plastic deformation. Protsessy v geosredakh. Processes in geomedia. 2019, 4 (22): 480–489. [In Russian].
11. Sretenskiy L.N. Teoriya volnovykh dvizheniy zhidkosti. Theory of wave motion of a liquid. M.: Nauka, 1977: 816 p. [In Russian]
12. Savel'yev B.A. Stroyeniye i sostav prirodnykh l'dov. The structure and composition of natural ice. M.: MGU, 1980: 280 p. [In Russian].
13. Von Bock und Polach R.U.F., Franz R. U., Ettemab R., Gralhera S., Kellnera L. Stendera M. The non-linear behavior of aqueous model ice in downward flexure. Cold Regions Science and Technology. 2019, 36 (1–3): 47–70. doi.org/10.1016/j.coldregions.
14. Epifanov V.P., Sazonov K.Ye. The influence of standing waves on the local strength of the ice field. Doklady Akademii Nauk. Reports of the Academy of Sciences. 2019, 489 (6): 30–35. [In Russian].
15. Manzhirov A.V., Lychov S.A. The mathematical theory of grow ing bodies at finite strains. Doklady Akademii Nauk. Reports of the Academy of Sciences. 2012, 443 (9): 438–441. [In Russian].
16. McReynolds A.W. Plastic deformation waves in aluminum. Transactions of the American Institute of Mining and Metaliurgical Engineers. 1949, 185: 32–45.
17. Bell Dzh.F. Eksperimental'nye osnovy mekhaniki deformiruemyh tverdyh tel. CH. 2. Experimental fundamentals of the mechanics of deformable solids. Part 2. M.:Nauka, 1984: 431 p. [In Russian].
18. Zuyev L.B. Autowave model of plastic flow. Fizicheskaya Mezomekhanika. Physical Mesomechanics. 2011, 14 (3): 85–94. [In Russian].
Supplementary files
For citation: Epifanov V.P., Sazonov K.E. Wave structures in the ice field and influence of them on the strength of salt ice. Ice and Snow. 2020;60(4):623-636. https://doi.org/10.31857/S2076673420040066
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