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Article Dans Une Revue Hydrological Sciences Journal Année : 2013

Investigation of the fractal dimension of rainfall occurrence in a semi-arid Mediterranean climate

Résumé

The scale invariance of rainfall series in the Tunis area, Tunisia (semi-arid Mediterranean climate) is studied in a mono-fractal framework by applying the box counting method to four series of observations, each about 2.5 years in length, based on a time resolution of 5 min. In addition, a single series of daily rainfall records for the period 1873-2009 was analysed. Three self-similar structures were identified: micro-scale (5 min to 2 d) with fractal dimension 0.44, meso-scale (2 d to one week) and synoptic-scale (one week to eight months) with fractal dimension 0.9. Interpretation of these findings suggests that only the micro-scale and transition to saturation are consistent, while the high fractal dimension relating to the synoptic scale might be affected by the tendency to saturation. A sensitivity analysis of the estimated fractal dimension was performed using daily rainfall data by varying the series length, as well as the intensity threshold for the detection of rain.
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Dates et versions

hal-00796040 , version 1 (22-12-2020)

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Hanen Ghanmi, Zoubeida Bargaoui, Cécile Mallet. Investigation of the fractal dimension of rainfall occurrence in a semi-arid Mediterranean climate. Hydrological Sciences Journal, 2013, 58 (3), pp.483-497. ⟨10.1080/02626667.2013.775446⟩. ⟨hal-00796040⟩
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