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Author(s): Harold G. Loomis

Journal: Science of Tsunami Hazards
ISSN 8755-6839

Volume: 20;
Issue: 1;
Start page: 38;
Date: 2002;
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Keywords: tsunami | tsunamis | tsunami waves | Tsunami events | Momentum of tsunami waves | wave propagation

In the generation and propagation of tsunamis, it seemed like the momentum might be a quantity of some usefulness. In many tsunami generating situations the source mechanism might impart significant initial velocity to the water in addition to surface displacement. In the cases of pyroclastic flow and landslides from land into the water this is surely the case. The property of momentum that is especially noteworthy is that, unlike energy, the momentum of a body of water is affected only by external forces and not by internal forces associated with turbulence or laminar flow. These latter aspects of wave propagation dissipate energy and have disappeared from the distant wave motions in which principally irrotational flow remains. The impulse, Fdt, where F are external forces on the body of water, result in a change of momentum, d(Mv) of the body of water. The momentum density of a column of water of dimensions dxdy and from the bottom to the surface corresponding to particle velocities v(z) is the quantity discussed in this paper.
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