How Pluvial Floods in Urban Areas Vary with Rain Return Period
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Infrastructure and environmental engineering (MPIEE), MSc
Publicerad
2023
Författare
COOPS, ALICIA
KARLSSON, FANNY
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Urban floods are the most frequently occurring natural disasters, posing significant
threats to cities worldwide. The risk for pluvial floods (i.e. floods due to intense rain fall) is increasing, and thereby, several initiatives have been established worldwide.
The aim of this study is to develop a tool to simplify the process of implementing
a cloudburst area in different types of residential areas by estimating a manageable
rain return period. The study evaluated floods generated by rain from return
periods in the range of 10-100 years, in four different residential areas with nearby
cloudburst areas, all located in the City of Gothenburg. Further, the study included
an evaluation of the site characteristics of each residential area.
Ten rain events (each representing a different return period) were simulated using
the hydrodynamic modeling software MIKE+. Simulations were conducted both
without and with cloudburst areas. From the results of the simulations without
cloudburst areas, a relation between flood and rain return period was established
for each residential area separately. No general relation was identified for all
investigated areas. However, a correlation was found for two of the areas consisting of
townhouses. Based on the correlation between the two areas, a framework for a tool
was developed. The developed tool provides an estimation of the manageable rain
return period due to the implementation of a cloudburst area in residential areas
with townhouses. From the study, it is concluded that to accomplish full utilization
of the cloudburst area it is necessary to evaluate both if other measures are required
and the most suitable location of the cloudburst area.
From the evaluation of site characteristics, different physical parameters were
identified to influence the resilience against floods in different areas, e.g. sewer network
capacity, building structure, and depression storage capacity. Further, this study
concluded that topography had a distinct impact on flooding in all areas.
Beskrivning
Ämne/nyckelord
flood management, hydrodynamic modeling, MIKE+, pluvial flood, rain return period, urban flood.