Stochastic model for generating hourly hyetographs
Résumé
This article describes the construction and the applications of a model to generate hourly
rainfall hyetographs. It was developed as a tool for estimating design floods on a small catchment
by converting long series of rainfall data (1000 yr) into runoff by means of an appropriate transfer
function model. Its performance is assessed through frequency analysis of 1-, 2-, .... 24-h
maximum rainfalls. The means and standard deviations of the simulated maximum rainfall
distributions are in the same order of magnitude as the values estimated from observed data.
Simulated extreme values are distinctly greater than those obtained by extrapolation of the
observed series with a simple exponential probability function. The geographical extension of the
model is encouraging, as shown by results from three rainfall recorders at three sites on the
Mediterranean seaboard displaying different rainfall patterns.
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