Promotie E. Cristiano: regenval

28 februari 2019 12:30 - Locatie: Aula, TU Delft - Door: webredactie

Effects of rainfall and catchment scales on hydrological response sensitivity in urban areas. Promotor 1: J.A.E. ten Veldhuis (CiTG); Promotor 2: N.C. van de Giesen (CiTG).

Spatial and temporal rainfall variability play an important role in generation of pluvial flooding. In urban areas, this phenomenon has increased in the last decades, due to an intensification of urbanization and imperviousness degree. The increase of urbanization, combined with short and intense rainfall events, caused by climate changes, result in a fast hydrological response, with high probability of flooding. Hydrological models can represent the overall flow behaviour, but they remain poorly capable of predicting flow peaks, especially in urban areas. Rainfall is generally measured with rain gauges, which provide accurate measurements in a specific point, but they are not able to fully describe rainfall variability in space. New technologies, such as weather radars, have been used in recent decades to estimate rainfall intensity. Although these instruments provide an indirect measurement of rainfall and require good calibration and error corrections, they can provide rainfall distribution in space and time, which is fundamental to investigate the hydrological response.

In this context, this work aims to a better knowledge of the hydrological response of the urban catchment to improve flood prediction and prevent damages caused by pluvial flooding. A new rainfall classification, based on the identification rainfall clusters, is introduced to describe rainfall variability in space and time. Dimensionless scale factors were defined in this work and applied to different study cases in order to define the minimum rainfall resolution required to obtain a certain level of performance of the model. 

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