Abstract
This work offers a detailed validation of finite volume (FV) flood models in the case where horizontal floodplain flow is affected by sewer surcharge flow via a manhole. The FV numerical solution of the 2D shallow water equations is considered based on two approximate Riemann solvers, HLLC and Roe, on both quadrilateral structured and triangular unstructured mesh-types. The models are validated against a high resolution experimental data-set obtained using a physical model of a sewer system linked to a floodplain via a manhole. It was verified that the sensitivity of the models is inversely proportional to the surcharged flow/surface inflow ratio, and therefore requires more calibration from the user especially when concerned with localised modelling of sewer-to-floodplain flow. Our findings provide novel evidence that shock capturing FV-based flood models are applicable to simulate localised sewer-to-floodplain flow interaction.
Highlights
During pluvial flood conditions, overland surface flow and surcharged sewer overflows may interact at exchange points such as manholes and gullies (Falconer et al 2009)
This paper presents a detailed verification of finite volume (FV) models against an original high-resolution experimental data-set using a physical model of a sewer system linked to a floodplain via a scaled manhole
This work has been motivated by the need to experimentally validate this modelling formulation when the floodplain flow is locally affected by a shock-wave arising from the impact of a surcharging manhole
Summary
Overland surface flow and surcharged sewer overflows may interact at exchange points such as manholes and gullies (Falconer et al 2009). From a numerical modelling perspective, the surcharging discharge component is often calculated in the manholes and added to the surface-flow system via additional sink/source terms in the SWE, in order to model the hydrodynamic of sewer-to-floodplain flow. Though this approach assumes that the system is full, it represent a worst-case scenario for flood hazard and is worth an assessment as such.
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