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  • 1995-1999  (2)
  • 1995  (2)
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  • 1995-1999  (2)
Year
  • 1995  (2)
  • 1
    Online Resource
    Online Resource
    On meltwater under ice shelves
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Oceans Vol. 100, No. C4 ( 1995-04-15), p. 6961-6965
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 100, No. C4 ( 1995-04-15), p. 6961-6965
    Abstract: The basic features of the flow of meltwater under ice shelves can be described by a set of simple relations and length scales. The flow may be divided into two regions, with different basic processes dominating in each. In the first region, melting of the underside of the ice shelf is important and the temperature and salinity of the current tend toward “equilibrium” values, such that the changes due to melting of the ice shelf are balanced by changes due to entrainment of ambient seawater. The equilibrium values change with depth owing to the effect of the change in pressure on the freezing point. As the current increases in thickness, it is no longer able to adjust sufficiently rapidly to the changing equilibrium values, arid the flow moves into the second region. The extent of the first region is governed by the location of the “ambient freezing point.” In the second region, melting is less important and the current behaves as an entraining drag‐limited gravity current in a stratified ambient fluid, leaving the shelf once the current has the same density as the ambient seawater. The heights of the two regions depend mainly on the ambient conditions and only indirectly on parameters such as slope angle, entrainment constant, drag coefficient, and turbulent transfer coefficients.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC03244
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
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    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
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    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
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    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Gravity current flow over obstacles
    Cambridge University Press (CUP) ; 1995
    In:  Journal of Fluid Mechanics Vol. 292 ( 1995-06-10), p. 39-53
    Details
    In: Journal of Fluid Mechanics, Cambridge University Press (CUP), Vol. 292 ( 1995-06-10), p. 39-53
    Abstract: When a gravity current meets an obstacle a proportion of the flow may continue over the obstacle while the rest is reflected back as a hydraulic jump. There are many examples of this type of flow, both in the natural and man-made environment (e.g. sea breezes meeting hills, dense gas and liquid releases meeting containment walls). Two-dimensional currents and obstacles, where the reflected jump is in the opposite direction to the incoming current, are examined by laboratory experiment and theoretical analysis. The investigation concentrates on the case of no net flow, so that there is a return flow in the (finite depth) upper layer. The theoretical analysis is based on shallow-water theory. Both a rigid lid and a free surface condition for the top of the upper layer are considered. The flow may be divided into several regions: the inflow conditions, the region around the hydraulic jump, the flow at the obstacle and the flow downstream of the obstacle. Both theoretical and empirical inflow conditions are examined; the jump conditions are based on assuming that the energy dissipation is confined to the lower layer; and the flow over the obstacle is described by hydraulic control theory. The predictions for the proportion of the flow that continues over the obstacle, the speed of the reflected jump and the depth of the reflected flow are compared with the laboratory experiments, and give reasonable agreement. A shallower upper layer (which must result in a faster return velocity in the upper layer) is found to have a significant effect, both on the initial incoming gravity current and on the proportion of the flow that continues over the obstacle.
    Type of Medium: Online Resource
    ISSN: 0022-1120 , 1469-7645
    URL: Article
    DOI: 10.1017/S002211209500142X
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1995
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