Regionalizing short-term rainfall affected by topography in semiarid Tunisia

Research output: Contribution to journalArticle

Abstract

The characteristics of fine time-scale rainfall are important in many hydrological applications, such as infiltration, erosion and flooding. The spatial properties of such rainfall are, however, seldom known, especially for arid and semi-arid areas. A better knowledge of fine time-scale rainfall and also comparison with daily rainfall may yield possibilities for disaggregation. For this purpose, rainfall data of different time scales, from 1-min to daily, from 25 stations during four years (1995–1998), were spatially analysed by means of spatial correlation, empirical orthogonal function (EOF) and hierarchical clustering. The results show that the spatial correlation is typically non-isotropic and varying, depending on topography and local meteorological settings. Similarly, spatial patterns of EOF are closely related to main atmospheric synoptic situations as influenced by orography and spatial dependence regarding areas with predominant convective and frontal rainfall. The clustering displayed different homogeneous sub-groups over the Tunisian Dorsal Mountains that can be used to better manage the limited water resources that often depend on fine time-scale rainfall variability.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Water Engineering

Keywords

  • régionalisation, analyse multivariable, pluie journalière, Atlantic mountain range, spatial rainfall patterns, fine time-scale rainfall, Tunisia, semi-arid, regionalization, daily rainfall, multivariate analysis, semi-aride tunisien, pluie à faibles pas de temps, propriétés spatiales, chaîne atlasique
Original languageEnglish
Pages (from-to)1199-1215
JournalHydrological Sciences Journal
Volume52
Issue number6
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes