Real time adjustment of slow changing flow components in distributed urban runoff models

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Abstract

In many urban runoff systems infiltrating water contributes with a substantial part of the total inflow and therefore most urban runoff modelling packages include hydrological models for simulating the infiltrating inflow. This paper presents a method for deterministic updating of the hydrological model states governing the infiltrating inflow based on downstream flow measurements. The fact that the infiltration processes follows a relative large time scale is used to estimate the part of the model residuals, at a gauged downstream location, that can be attributed to infiltration processes. This information is then used to update the states of the hydrological model. The method is demonstrated on the 20 km2 Danish urban catchment of Ballerup, which has substantial amount of infiltration inflow after succeeding rain events, for a very rainy period of 17 days in August 2010. The results show big improvements for regular simulations as well as up to 10 hour forecasts. The updating method reduces the impact of non-representative precipitation estimates as well as model structural errors and leads to better overall modelling results.
Original languageEnglish
Title of host publicationProceedings of the 12th International Conference on Urban Drainage
Number of pages8
Publication date2011
Publication statusPublished - 2011
Event12th International Conference on Urban Drainage - Porto Alegre, Brazil
Duration: 11 Sep 201116 Sep 2011
Conference number: 12
http://www.acquacon.com.br/icud2011/en/

Conference

Conference12th International Conference on Urban Drainage
Number12
Country/TerritoryBrazil
CityPorto Alegre
Period11/09/201116/09/2011
Internet address

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