Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Assessment of multifractal spectra of river networks
Año:2008
Áreas de investigación
  • Matemáticas,
  • Procesado y análisis de la señal
Datos
Descripción
During time, the multifractal geometry has got increasing relevance as a tool for understanding many complex phenomena. In fluvial geomorphology, as a particular case, the research carried out in the last decades has evidenced that the scaling properties of drainage basins, river networks and braided channels are better understood in the framework of multiscaling and multifractal, instead of simple fractal sets. In particular, it was evidenced by several works that two-dimensional projections of river networks and braided channels on topographic maps are multifractal, non-planefilling structures (support fractal dimension less than two). Moreover, the multifractal parameters obtained from the analysis can be used for a redefinition of the Instantaneous Unit Hydrograph (IUH), in order to improve the prediction of the hydrologic response of a basin (flood hydrograph). In order to get definite conclusions about such matters, however, a fundamental task to be accomplished is the precise assessment of both positive and negative moment orders of probabilities of the multifractal spectra. The determination of the complete multifractal spectra, when carried out on natural objects, like rivers and channels, has to be performed through numerical methods. Traditionally, two separated classes of numerical algorithms exist, which lead to the assessment of the multifractal spectra of a given set of points: Fixed-Size Algorithms (FSAs) or Fixed-Mass Algorithms (FMAs). Methods belonging to the former class are: 1) standard box-counting algorithms (Block et al., 1990); 2) the sandbox method (Tél et al., 1989); 3) the Generalized Correlation Integral Method (GCIM) (Pawelzik and Schuster, 1989); 4) the Gliding Boxes Algorithm (GBA) (Allain and Cloitre, 1991). Concerning the latter class, the standard FMA by Badii and Politi (1984, 1985), was applied in the past (De Bartolo et al., 2006).
Internacional
Si
Nombre congreso
EGU General Assembly 2008
Tipo de participación
960
Lugar del congreso
Viena, Austria
Revisores
Si
ISBN o ISSN
1029-7006
DOI
Fecha inicio congreso
13/04/2008
Fecha fin congreso
18/04/2008
Desde la página
1
Hasta la página
3
Título de las actas
Geophysical Research Abstracts, Vol. 10, SRef-ID: 1607-7962/gra/EGU2008-A-10301
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Leonardo Primavera (Dipartimento di Fisica, Università della Calabria, Rende (CS), Italia)
  • Autor: Roberto Gaudio (Dipartimento di Difesa del Suolo “V. Marone”, Università della Calabria, Rende (CS), Italia)
  • Autor: Ana Maria Tarquis Alfonso (UPM)
  • Autor: Samuele De Bartolo (Dipartimento di Difesa del Suolo “V. Marone”, Università della Calabria, Rende (CS), Italia)
  • Autor: Massimo Veltri (Dipartimento di Difesa del Suolo “V. Marone”, Università della Calabria, Rende (CS), Italia)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Automatización en Señal y Comunicaciones (GASC)
  • Departamento: Matemática Aplicada a la Ingeniería Agronómica
  • Centro o Instituto I+D+i: Centro de Estudios e Investigación para la Gestión de Riesgos Agrarios Medioambientales (CEIGRAM)
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)