Breakdown of under-water gas hydrate deposits. (English. Russian original) Zbl 1302.76188
Fluid Dyn. 49, No. 5, 645-654 (2014); translation from Izv. Ross. Akad. Nauk, Mekh. Zhidk. Gaza 2014, No. 5, 93-103 (2014).
Summary: At the floor and upper sediment layers of the submarine volcano Håkon Mosby gas (methane) hydrate deposits have been discovered. Measurements of the water-dissolved methane concentration at different depths near the volcano have shown that its level is higher than the average level in the Ocean. In order to understand the effects observed in concentration distribution, a model is proposed for describing the propagation of methane formed as a result of decomposition of depth and floor hydrate over the hydrosphere. Within the framework of physical modeling the kinetics of methane dissolution and its distribution in the hydrosphere are traced numerically with account for transfer anisotropy in different directions and undercurrents. The dissolution rate and the mass transfer directions are determined and the concentration fields in the floor layers are calculated. It is shown that methane is rapidly dispersed in the hydrosphere and, thus, significant volumes with high methane concentration cannot be formed. Practical recommendations are given for hunting hydrate deposits in water areas. The model proposed is applicable to describing the propagation of any admixture in different anisotropic media.
MSC:
| 76T10 | Liquid-gas two-phase flows, bubbly flows |
| 76R50 | Diffusion |
| 86A05 | Hydrology, hydrography, oceanography |
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