STUDY OF THE VELOCITY OF ARTIFICIAL MUDFLOW ON A LABORATORY STAND
In August 2020, an experiment was conducted to measure the velocity of an artificial coherent mudflow on a laboratory stand. The stand is a rectangular cross-section tray with a length of 3.0 m, a width of 0.25 m, a depth of 0.25 m, slope – 29°. 4 racks were installed in the tray to measure the hydrodynamic pressure of the mudflow. The movement of the mudflow was filmed by a high-speed video camera. Velocity of artificial mudflow were measured. Most of the mudflow mixture soil is made up of particles less than 0.25 mm in size (34%). The density of the prepared mudflow mixture was 1 880 kg/m3. Density of mudflow deposits 2 040 kg/m3. Despite the small values of the Reynolds number, the turbulent movement of the mudflow was observed. Comparison of the results of the measured mudflow velocities with the velocities calculated by different methods of calculating the mudflow velocity based on the structure of the Shezi formula (for Newtonian fluids) showed a strong variation of the calculated values. The methods either greatly overestimate or, on the contrary, greatly underestimate the measured values. This is probably due to the fact that the connected mudflow is not a Newtonian fluid, but a non-Newtonian fluid. The closest physical analogue of a connected mudflow is a pseudoplastic (non-Newtonian) fluid whose viscosity decreases with increasing shear stress. As a physical model of a connected mudflow, it is advisable to use the Bingham fluid model, the flow of which is similar to the flow of coherent debris-flows and mudflows
Fleishman S.M. Seli [Mudflow]. Leningrad, Publ. Gidrometeoizdat, 1978. 312 p. (In Russian).
Golubtsov V.V. O gidravlicheskom soprotivlenii i formule dlya rascheta srednei skorosti techeniya gornykh rek [About the hydraulic resistance and a formula for calculation of average speed of a current of the mountain rivers]. Trudy Kazakhskogo regional'nogo nauchno-issledovatel'skogo gidrometeorologicheskogo instituta [Transactions of the Kazakh Regional Hydrometeorological Research Institute], 1969, no. 33, pp. 30-41. (In Russian).
Goncharov V.N. Dinamika ruslovykh potokov [Channel flow dynamics]. Leningrad, Publ. Hydrometeorological, 1962. 358 p. (In Russian).
Kazakov N.A. Fazovye perekhody v selevoi geosisteme [Phase transitions in the debris flow geosystems]. Gidrosfera. Opasnye protsessy i yavleniya [Hydrosphere. Hazard processes and phenomena], 2019, vol. 1, iss. 2, pp. 172-189. DOI: 10.34753/HS.2019.1.2.001. (In Russian; abstract in English).
Kazakov N.A., Bobrova D.A., Kazakova E.N., Rybal'chenko S.V. Issledovanie dinamiki selei na eksperimental'nom stende [The study of the debris-flows dynamics on an experimental stand]. Gidrosfera. Opasnye protsessy i yavleniya [Hydrosphere. Hazard processes and phenomena], 2019, vol. 1, iss. 4, pp. 490-503. DOI: 10.34753/HS.2019.1.4.490. (In Russian; abstract in English).
Kryukov E.V., Butenko V.M. Opasnye prirodnye protsessy: uchebno-metodicheskoe posobie [Hazardous natural processes]. Moscow, Publ. of Academy of State Fire Service EMERCOM of Russia. 119 p. (In Russian).
Natishvili O.G., Tevzadze V.I. Osnovy dinamiki selei [The fundamentals of debris-flow dynamics]. Tbilisi, 2007. 213 p. (In Russian; abstract in English).
Rzhevskii B.N. Otsenka tormozyashchei roli odinochnogo prepyatstviya, obtekaemogo lavinnym potokom [Assessment of the inhibitory role of a single obstacle streamlined by an avalanche stream]. Voprosy proektirovaniya, stroitel'stva i rekonstruktsii zheleznykh dorog Sibiri: mezhvuzovskii sbornik nauchnykh trudov [Issues of design, construction and reconstruction of Siberian railways: interuniversity collection of scientific papers]. Novosibirsk, 1984, pp. 101-109. (In Russian).
Sokolova D.P., Kurovskaya V.A., Ostashov A.A., Kazakov N.A. Otsenka dinamicheskikh kharakteristik selevogo potoka po materialam videos"emki [Evaluation of debris flow dynamic characteristics by video materials]. Gidrosfera. Opasnye protsessy i yavleniya [Hydrosphere. Hazard processes and phenomena], 2019, vol. 1, iss. 1, pp. 31-51. DOI: 10.34753/HS.2019.1.1.003. (In Russian; abstract in English).
Sribnyi M.F. Formula srednei skorosti techeniya rek i ikh gidravlicheskaya klassifikatsiya po soprotivleniyu dvizheniyu [Formula of the average flow velocity of rivers and their hydraulic classification by resistance to the movement] Issledovaniya i kompleksnoe ispol'zovanie vodnykh resursov [Researches and complex use of water resources]. Moscow: Publishing house of the USSR Academy of Science, 1960, pp. 204-220. (In Russian).
Wei F., Yang H., Hu K., Hong Y., Li X. Two methods for measuring internal velocity of debris flows in laboratory. WIT Transactions on Engineering Sciences, 2012, vol 73, pp. 61-71. DOI: 10.2495/DEB120061.
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