INVESTIGADORES
MARINO Beatriz Maria
artículos
Título:
The spreading of a gravity current over a permeable surface
Autor/es:
MARINO, BM; THOMAS, LP
Revista:
JOURNAL OF HYDRAULIC ENGINEERING
Editorial:
ASCE American Society of Civil Engineers
Referencias:
Año: 2002 vol. 128 p. 527 - 533
ISSN:
0733-9429
Resumen:
Plane inertial gravity currents running over horizontal permeable
surfaces are studied. An analytical simple model based on local and
global balances is derived which describes the propagation and
infiltration of an incompressible dense fluid on and through the
surface. Results of laboratory experiments are presented which are in
accordance with scaling laws suggested analytically. It is found that
the loss of mass, the velocity, and the position of the front of the
current follow exponential relationships. The dynamics is governed by a
particular decay time related to the initial volume released and
reduced gravity g′0. However this decay time
exhibits a different functional relationship from that obtained for
currents evolving over thin permeable bottoms when the downward flow is
viscous. As a consequence of the loss of mass, the distance to
extinction of the current is found to be independent of g′0.