Interaction between storm water conduit and surface flow for urban flood inundation modelling

Abstract

Rapid development of urban areas always comes with great side effects. One of them is the occurrence of urban floods. Growth of impervious surfaces in cities leads to increasing run-off values. This together with difficulties connected with sewage modernization in cities marks urban inundations as being one of the most important issues concerning urban water. Accurate prediction of a phenomenon is difficult as it is highly dependent on local conditions and the quality of available data about them. A most recent approach to modelling urban flooding involves a detailed description of the interaction between storm water sewage flow modelling and surface flow modelling. In this paper we will describe a numerical model of urban inundation that is being used to analyse the phenomenon, which consists of 1D storm water flow model (explicit McCormack scheme) and 1D surface flow model (diffusive wave). But before that laboratory tests describing the interaction between used models will be introduced. We will try to evaluate how different surface flow conditions affect interaction and find out if there is an easy way to implement it in coupled numerical modelling of large-scale urban areas inundations. Because tests are still being conducted and further investigation of phenomenon is being done, the conclusions are only preliminary and should be treated as a guideline for future work.

Integrated modelling of overland flows and drainage networks in a urban environment

“…An obvious next step for improving Itzï is to build upon the recent advances in physical modelling of the interactions between a drainage network and a surface flume (Hakiel and Szydłowski, 2017;. Using the results from such experiments as benchmarks will allow to 1) assess the capacity of Itzï to accurately model the interactions between a drainage network and a surface model, and 2) have an approach of the range of acceptable values that could be used to calibrate a coupled model in a real-world event.…”

“…This permitted the authors to propose weir and orifice coefficients to be used by models using this type of interface. This however should be considered a first step, as some preliminary results obtained with a similar physical set-up that allows the change in slope of the flume indicates that those coefficients might be correlated with the Froude number of the overland flow (Hakiel and Szydłowski, 2017).…”

“…This solution has been use by other authors (A. S. Chen et al, 2015;Leandro and Martins, 2016;Martins et al, 2017;Seyoum et al, 2012). Its ability to adequately reproduce actual physical processes has been proven by comparing by physical experiments (Hakiel and Szydłowski, 2017;Rubinato et al, 2017). As seen in Section 2.2, different authors use different combinations of criteria to apply those equations.…”