On the dynamics of quasi-steady gravity currents flowing up a slope
| Autor: | M.C. De Falco, Claudia Adduce, M. E. Negretti, Emil J. Hopfinger |
|---|---|
| Přispěvatelé: | Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), De Falco, M. C., Adduce, C., Negretti, M. E., Hopfinger, E. J. |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Gravity (chemistry) 010504 meteorology & atmospheric sciences [SDE.IE]Environmental Sciences/Environmental Engineering Depth averaged 0208 environmental biotechnology Dynamics (mechanics) Sloping bottom Boundary (topology) Gravity current 02 engineering and technology Mechanics 01 natural sciences Shape parameter 020801 environmental engineering Experiment Quasi steady Front velocity Theoretical model Current (fluid) 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Advances in Water Resources Advances in Water Resources, Elsevier, 2021, 147, pp.103791. ⟨10.1016/j.advwatres.2020.103791⟩ |
| ISSN: | 0309-1708 |
| Popis: | International audience; Quasi-steady gravity currents propagating first on a horizontal and then up a sloping boundary are investigated by means of theoretical analysis and laboratory experiments. The bottom slope ranged from 0.18 to 1 and full-and partial-depth configurations were considered. The developed theoretical model, using the depth averaged momentum equation, provides new physical insight into the importance of the different forces that act on the current and accounts for the gravity component along the slope, whose effect increases with both the slope angle and the ratio of current to ambient fluid depths. The height of the current decreases linearly with up-slope distance and the spatial rate of decrease, expressed by the current shape parameter is determined from the theory, using the measured up slope distance at which the current stops. This current shape parameter is found to depend on the slope only and it is not dependent on the current to ambient fluid depths. It can then be used to calculate the current velocity and the up-slope distance reached by the current. It is shown that the front velocity of all performed experiments is predicted by the theory indicating that the theory remains valid up to a slope equal to 1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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