On the Nature of Gravity Currents
Abstract: A series of
laboratory experiments are used to examine the nature of a gravity current
propagating along the base of a horizontal channel. The shear instability
formed at the interface between two counter-flowing layers generates turbulence
and mixing, particularly above the head of the current. While the resulting
mixing is in part examined through its effects on the flow dynamics, the
characteristics of the gravity current is determined by measuring the depth and
speed of the current. The results for both shallow and deep currents reveal
that the current depth is found to be 0.36-0.47 H, where H is the full water
depth. The non-dimensional current speed is measured to be 0.48±0.02, independent
of flow processes and dynamic variables.
Author: Tjipto Prastowo
Journal Code: jpfisikagg090004
