Instabilities of Gravity Currents along a Slope
نویسندگان
چکیده
منابع مشابه
Gravity currents shoaling on a slope
Laboratory experiments are performed to examine gravity currents propagating into an ambient of uniformly decreasing depth. Predominantly, the study is of a surface gravity current shoaling over a bottom slope as it approaches a corner between the horizontal surface and the sloping topography. For sufficiently high Reynolds number currents, they are found to propagate at a constant speed over t...
متن کاملThe low-Reynolds number spreading of axisymmetric drops and gravity currents along a free surface
Experimental results are presented for the spreading of buoyant drops and gravity currents along a free surface. The spreading occurs at low Reynolds number, and no interfacial tension exists between the spreading and ambient fluid. Theoretical results suggest that distinct spreading rates occur in three regimes: l!@ ln(R/a)#a/R, a/R!l!R/a , and l@R/a , where l is the ratio of the spreading and...
متن کاملEntraining gravity currents
Entrainment of ambient fluid into a gravity current, while often negligible in laboratory-scale flows, may become increasingly significant in large-scale natural flows. We present a theoretical study of the effect of this entrainment by augmenting a shallow water model for gravity currents under a deep ambient with a simple empirical model for entrainment, based on experimental measurements of ...
متن کاملMixing in gravity currents
We study entrainment in lock-release gravity currents using highly spatially resolved optical transmission experiments and quantitative analysis of the available potential energy of the flow. The principal results provide a resolution to the debate regarding the mechanism and degree of mixing in the head of a gravity current during the slumping phase. The nature of the complex internal mixing s...
متن کاملSustained gravity currents in a channel
Gravitationally driven motion arising from a sustained constant source of dense fluid in a horizontal channel is investigated theoretically using shallow-layer models and direct numerical simulations of the Navier–Stokes equations, coupled to an advection–diffusion model of the density field. The influxed dense fluid forms a flowing layer underneath the less dense fluid, which initially filled ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physical Oceanography
سال: 2001
ISSN: 0022-3670,1520-0485
DOI: 10.1175/1520-0485(2001)031<0030:iogcaa>2.0.co;2