Validez de la técnica de intensidad instantánea para la extracción de hietogramas de diseño típicos

Abstract

The absence of suitable historical flow discharge records makes it necessary to evaluate design floods indirectly, by transforming design storm which are critical rainfall event that are likely to occur with a certain probability. The prediction of such rainfall events includes the definition of its typical temporal distribution or typical hyetograph. A technique to estimate that temporal distribution is extracting data from the rainfall intensity–duration-recurrence (i-d-T) curves through the instantaneous intensity method. This technique produces a continuous hyetograph that is automatically compatible with the use of i-d-T models from where the data is extracted such as the DIT Model (Caamaño Nelli and García, 1999). The objectives of this work are: a) to evaluate typical hyetograph distribution generated using the instantaneous intensity method implemented with the DIT model with three parameters (Caamaño Nelli et al, 2012); and b) to apply this distribution using data from Ceres (Santa Fe) for short durations and to compare the results with the typical hyetograph distribution estimated using methods proposed by Huff (1967) and Pilgrim and Cordery (1975). As a result, the hyetograph equation does not change with the recurrence, the loss of volume is corrected and the peak height is much more plausible. This supports the procedure tested and does it recommendable in the absence of historical hyetographs.