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Urban drainage models for green areas: Structural differences and their effects on simulated runoff
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0002-6907-8127
Norwegian University of Science and Technology, Trondheim, Norway.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-0367-3449
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-1725-6478
2019 (English)In: Journal of Hydrology X, ISSN 2589-9155, Vol. 5, article id 100044Article in journal (Refereed) Published
Abstract [en]

Mathematical stormwater models are often used as tools for planning and analysing urban drainage systems. However, the inherent uncertainties of the models must be properly understood in order to make optimal use of them. One source of uncertainty that has received relatively little attention, particularly for increasingly popular green areas as part of urban drainage systems, is the mathematical model structure. This paper analyses the differences between three different widely-used models (SWMM, MOUSE and Mike SHE) when simulating rainfall runoff from green areas over a 26-year period. Eleven different soil types and six different soil depths were used to investigate the sensitivity of the models to changes in both. Important hydrological factors such as seasonal runoff and evapotranspiration, the number of events that generated runoff, and the initial conditions for rainfall events, varied significantly between the three models. MOUSE generated the highest runoff volumes, while it was rather insensitive to changes in soil type and depth. Mike SHE was mainly sensitive to changes in soil type. SWMM, which generated the least runoff, was sensitive to changes in both soil type and depth. Explanations for the observed differences were found in the descriptions of the mathematical models. The differences in model outputs could significantly impact the conclusions from studies on the design or analysis of urban drainage systems. The amount and frequency of runoff from green areas in all three models indicates that green areas cannot be simply ignored in urban drainage modelling studies.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 5, article id 100044
Keywords [en]
Model structure uncertainty, Urban drainage, Green areas, Runoff, Infiltration, Stormwater models
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76902DOI: 10.1016/j.hydroa.2019.100044OAI: oai:DiVA.org:ltu-76902DiVA, id: diva2:1373819
Funder
Swedish Research Council Formas, 2015-121Vinnova, 2016-05176
Note

Validerad;2019;Nivå 1;2019-11-28 (johcin)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-11-29Bibliographically approved

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Broekhuizen, IcoLeonhardt, GüntherViklander, Maria

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7891011121310 of 78
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