The <i>l</i><sup>1/2</sup> law and multifractal topography: theory and analysis - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Nonlinear Processes in Geophysics Année : 1995

The l1/2 law and multifractal topography: theory and analysis

Résumé

Over wide ranges of scale, orographic processes have no obvious scale; this has provided the justification for both deterministic and monofractal scaling models of the earth's topography. These models predict that differences in altitude (?h) vary with horizontal separation (l) as ?h ˜ lH. The scaling exponent has been estimated theoretically and empirically to have the value H=1/2. Scale invariant nonlinear processes are now known to generally give rise to multifractals and we have recently empirically shown that topography is indeed a special kind of theoretically predicted "universal" multifractal. In this paper we provide a multifractal generalization of the l1/2 law, and propose two distinct multifractal models, each leading via dimensional arguments to the exponent 1/2. The first, for ocean bathymetry assumes that the orographic dynamics are dominated by heat fluxes from the earth's mantle, whereas the second - for continental topography - is based on tectonic movement and gravity. We test these ideas empirically on digital elevation models of Deadman's Butte, Wyoming.
Fichier principal
Vignette du fichier
npg-2-16-1995.pdf (539.82 Ko) Télécharger le fichier
Origine : Accord explicite pour ce dépôt

Dates et versions

hal-00331032 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00331032 , version 1

Citer

S. Lovejoy, D. Lavallée, D Schertzer, P. Ladoy. The l1/2 law and multifractal topography: theory and analysis. Nonlinear Processes in Geophysics, 1995, 2 (1), pp.16-22. ⟨hal-00331032⟩
319 Consultations
96 Téléchargements

Partager

Gmail Facebook X LinkedIn More