Surface Water Hydrology

Oral Abstract

Investigating the Impact of Rainfall Spatiality on Urban Floods

Wednesday, January 4
10:30 AM - 12:30 PM
Location: 7th Meeting Room

Urban flooding has been one of the major natural hazards over the past few decades around the world. This leads to comprehensive work to develop statistical or physical models for estimating frequency and magnitude of urban floods with given return levels, with which water infrastructure (e.g., pipes, pumps) can be effectively designed to mitigate resultant impacts. Rainfall intensity, one of the most important factors that affect urban floods, has been extensively analyzed in previous studies, with main emphasis either on its probability modeling or on its variation in a changing climate. Rainfall spatiality, however, has been given little attention during the urban flooding assessment as spatially constant rainfall intensity is typically applied to the entire catchment for flooding estimation. This study attempts to investigate the impact of the rainfall spatiality on urban floods, particularly focusing on the variation of peak discharge, overflow volume and flooding duration as a function of changing spatiality in rainfall intensity applied to two real-world urban drainage systems. To our best knowledge, this is the first work that the spatial variability in rainfall intensity has been incorporated into the estimation of urban flooding risk.

Feifei Zheng

Professor
Zhejiang University

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