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

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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.

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Martins, R., Kesserwani, G., Rubinato, M., Lee, S., Leandro, J., Djordjević, S., & Shucksmith, J. D. (2017). Validation of 2D shock capturing flood models around a surcharging manhole. Urban Water Journal, 14(9), 892–899. https://doi.org/10.1080/1573062X.2017.1279193

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