Experimental Validation of Interaction Model at Storm Drain for Development of Integrated Urban Inundation Model

Abstract

University (Katsura compus, Nishikyo-ku, Kyoto 615-8540, Japan) 2 Member of JSCE, Dr. of Eng., Prof., DPRI, Kyoto University (Yoko-oji, Fushimi, Kyoto 612-8235, Japan) 3 Member of JSCE, Dr. of Eng., Assoc. Prof., DPRI, Kyoto University (Yoko-oji, Fushimi, Kyoto 612-8235, Japan) 4 Member of JSCE, Dr. of Eng., Assis. Prof., DPRI, Kyoto University Fushimi, Japan) Recently, there have been a lot of numerical models for prediction of urban inundation damage due to heavy rainfall by using the combined drainage system. Although it is important to estimate inlet and overflow discharge through the storm drain, calculation method and formula are not clarified. Hence, in this study, the numerical model of storm water interaction between the ground surface and drainage system we have previously used is improved and validated based on physical experiments. From the comparison, they showed agreement in all the cases of steady state condition. In the unsteady state cases, it was found that simulation results agreed well with experimental results of the ground inundation start time and the maximum inundation depth as well as the water level increase process. However, piezometric head reproduced small differences when the downstream water level was decreased. It was judged that was caused by inadequate consideration of exit and entrance head loss between the tank and pipe.

Validation of 2D shock capturing flood models around a surcharging manhole

“…Nonetheless, 3D modelling of these events system yields prohibitive runtime costs and is currently unforeseeable at street scale in the urban environment (Cea et al 2010). Practically, it has become common to tackle modelling of sewer-to-floodplain flow interaction as a compound system consisting of 2D surface and 1D sewer-flow systems (Chen et al 2015, Lee et al 2013, Martins et al 2016, Seyoum et al 2012.…”

“…Fully-coupled approaches involve implicit coupling, of a 1D or 2D surface flow model, with a 1D unsteady pipe flow solver (Chen et al 2015, Djordjević et al 2005, Lee et al 2013, Martins et al 2016, Seyoum et al 2012. In many of these works, sewer overflow is accounted for using only one computational cell, and for real-site applications (Martins et al 2016 conditions to produce systematic increase in the sewer surcharge rate into a shallow flow over a floodplain.…”

Urban inundation simulation considering road network and building configurations

“…The run-off flow model used in this study consisted of a horizontal 2D inundation flow model (Kawaike et al, 2002) and a 1D slot model of sewer pipe flow (Chaudhry, 1979), while the interaction models were composed of the weir and orifice formula to calculate exchange discharge at the storm drains and the adjoining part between manholes and pipes (Lee et al, 2013). The run-off flow model used in this study consisted of a horizontal 2D inundation flow model (Kawaike et al, 2002) and a 1D slot model of sewer pipe flow (Chaudhry, 1979), while the interaction models were composed of the weir and orifice formula to calculate exchange discharge at the storm drains and the adjoining part between manholes and pipes (Lee et al, 2013).…”

“…The first is a lack of sewer system capacity, and the second is an insufficiency of storm drains' capacity (Lee et al, 2013). The first is a lack of sewer system capacity, and the second is an insufficiency of storm drains' capacity (Lee et al, 2013).…”

“…The first is a lack of sewer system capacity, and the second is an insufficiency of storm drains' capacity (Lee et al, 2013). However, Lee et al (2013) have emphasized the importance of storm drains as exchange spots of bi-directional interactions to approximate reality. On the other hand, if the flow rate does not exceed the maximum capacity, the surface flow can be captured and drained through the storm drain.…”