A master thesis from Aalborg University
Analysis of urban catchment for flood return period assessment
Author(s)
Term
4. term
Publication year
2016
Submitted on
2016-06-07
Pages
53 pages
Abstract
Nærværende projekt omhandler analyse at et specifikt urban afløbsopland og har til formål at kunne bestemme gentagelsesperioden for oversvømmelseshændelser ud fra lokal oversvømmelsesdybde, oversvømmelsesvolumen og oversvømmelsesudbredelse. Igennem de sidste årtier er ekstreme regnhændelser hovedårsagen til oversvømmelser i urbane områder i Danmark. I nærværende projekt er ekstreme regnhændelser udvalgt fra historiske regnserier og analyseret med hensyn til oversvømmelse på et konkret opland i Lystrup nær Aarhus. Oplandet er karakteriseret ved stor terrænvariabilitet, herunder både flade og for danske forhold relativt stejle områder. Derfor er oplandet karakteriseret som afstrømningsmæssigt irregulært. I projektet er sammenhængen mellem gentagelsesperiode for oversvømmelsen og gentagelsesperioden for regnen er analyseret og diskuteret. Det er konkluderet at der er stor variabilitet mellem gentagelsesperioden for regnen og gentagelsesperioden for oversvømmelsen. Derfor kan det være svært at karakterisere en oversvømmelse ud fra regnen alene.
The purpose of this study is to analyse an urban catchment for assessing the return period of floods. Denmark has been affected by extreme rainfall events in the last decades causing high environmental and social impacts which lead to social and economic losses. This study is focused in the use of historical rain series to analyse the relationship between the return period of flood and the return period of rainfall. The catchment under study has a large terrain variability which is considered to be irregular since it comprises steep and flat areas, complex flow in drainage systems and on surface. From the historical rain series, a selection of 10 extreme rainfall events are chosen and simulated to study and analyse their flood. At the end of the document are discussed the obtained results analysing if the use of historical rain series is more appropriate than the use of synthetic rain for flood modelling. Furthermore, the maximum flood depth, maximum flood extent and maximum flood volume of the catchment are found for each of the events and then discussed to determine which of these variables is the most accurate to assess the return period of flood.
Keywords
Documents
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