Hot Spots And Nonhydraulic Effects In
Surface Gravity Flows
Author(s)
T. B. Moodie, J. P. Pascal & S. J. D. D’Alessio
Abstract
Surface gravity currentswhose flowdynamics aremodified by incoming solar radiation
are of importance in the study of mechanisms related to the thermal bar in
dimictic lakes as well as the spread of pollutants on the surfaces of reservoirs, lakes
and oceans. We shall present results for such surface flows showing their dependence
on various model parameters including the bottom slope, rate of heating and
equation of state. The novel feature of this analysis is to show that the inclusion
of a heat source term leads to the introduction of shear in the horizontal velocity
field thereby ruling out the deployment of shallow-water theory with its depthindependent
velocity field as a viable description of such flows. Calculations are
presented to demonstrate that a purely hydraulic description will miss important
dynamical features of the flows.
Keywords: surface gravity currents, thermal enhancement, nonhydraulic effects.
1 Introduction
A gravity current consists of the flow of one fluid within another when this flow
is driven by the density difference between these fluids [1]. These currents are primarily
horizontal, occurring as either top or bottom boundary currents or as intrusions
at some buoyantly stable intermediate level. The density differences driving
such flows may be due to salinity contrasts, as in oceanic settings [1], the presence
of suspended material, as in the case of turbidity currents [2, 3], or temperature
Keywords
surface gravity currents, thermal enhancement, nonhydraulic effects.
Related Book
Other papers in this volume
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