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Details van artikel 68 van 113 gevonden artikelen
| Titel: |
Movement of large gas bubbles in unsaturated fine-grained sediments |
| Auteur: |
Wheeler, S. J. |
| Verschenen in: |
Marine georesources & geotechnology |
| Paginering: | Jaargang 9 (1990) nr. 2 pagina's 113-129 |
| Jaar: |
1990 |
| Inhoud: |
Where undissolved gas occurs within fine-grained marine sediments it usually takes the form of discrete bubbles that are much larger than the normal void spaces. The possibility of buoyancy-induced movement of these relatively large bubbles must be included when considering the transport of gas through marine sediments. A theoretical analysis shows that, under static loading conditions, bubbles larger than a critical size should have sufficient buoyancy to move upward through a fine-grained sediment stratum, whereas bubbles smaller than the critical size should remain fixed in position. The critical radius is directly proportional to sediment shear strength, and bubbles of a realistic size should move upward only in extremely weak sediments. Further theoretical analysis shows that the critical bubble size is reduced under cyclic loading conditions, but movement of typical-sized bubbles should still be restricted to sediments of low shear strength. A simple laboratory experiment provides support for the conclusions of the theoretical analysis. The results indicate that buoyancy-induced movement of relatively large gas bubbles in fine-grained sediments is most likely to occur under storm loading conditions and is unlikely to occur at depths greater than a few meters below the seabed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 68 van 113 gevonden artikelen
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