A comparison of three dual drainage models: shallow water vs local inertial vs diffusive wave

Martins, Ricardo; Leandro, Jorge; Chen, Albert S.; Djordjević, Slobodan

doi:10.2166/hydro.2017.075

Cited by 48 publications

(26 citation statements)

References 42 publications

(36 reference statements)

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“…The minor system, the enclosed drainage system, conveys the flow underground or through enclosed structures to remove the water from the affected areas, is usually modeled through a network of 1‐D surchargeable pipes, culverts, or small watercourses. The connection between both systems is made through a linkage, which includes the urban drainage linking elements such as gullies, manholes, and gutters, and is usually modeled as a calibratable single weir/orifice equation (Martins, Leandro, Chen, et al, ) as a simplification. The accuracy of such a simplification is dependent on the appropriate determination of both an energy loss coefficient, as well as the prevailing hydraulic head within the linkage structure (Rubinato et al, ).…”

Section: Introductionmentioning

confidence: 99%

On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events

Martins

Rubinato

Kesserwani

et al. 2018

Water Resources Research

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The accurate characterization of flow from urban surfaces to sewer/stormwater systems is important for urban drainage design and flood modeling/risk identification. However, the geometrical complexity and large variety of drainage structures (linking elements) available makes model calibration and verification difficult. In this study an extensive comparison between experimentally measured and numerically modeled flow characteristics in the vicinity of ten different designs of manhole grate was performed under drainage flow in subcritical conditions. Using a 2‐D surface PIV (sPIV) system the work presents the first detailed characterization of velocity fields around these linking elements. In addition, it provides the first detailed verification of the ability of a 2‐D numerical model to describe both velocity fields and drainage flows. The overall comparison shows a close relationship between numerical and the experimental results with some higher inflows in the experimental results as a consequence of a localized transition from weir to orifice condition near the void areas of the grates. It was also noted that velocity differences decreased further from the manhole, due mainly to the more directional flow. Overall the work demonstrates the potential for further use of 2‐D numerical models to describe flow conditions at linking elements, either directly within modeling simulations or indirectly via the characterization of energy loss coefficients.

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Section: Introductionmentioning

confidence: 99%

On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events

Martins

Rubinato

Kesserwani

et al. 2018

Water Resources Research

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“…HEC-RAS solves either 2D Saint Venant or 2D diffusion-wave equations. The latter allows faster calculation and has greater stability due to its complex numerical schemes (Martins et al, 2017). Due to these advantages and suitability for use in real-time inundation forecast (Henonin et al, 2013), we have used the diffusive-wave model that was previously set-up, calibrated and validated in Bhola et al (2018a) and Bhola et al (2018b).…”

Section: Hydrodynamic Modellingmentioning

confidence: 99%

Hazard maps with differentiated exceedance probability for flood impact assessment

Bhola

Leandro

Disse

2019

Preprint

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Abstract. In operational flood risk management, a single best-model is used to assess the impact of flooding, which might misrepresent uncertainties in the modelling process. We have used quantified uncertainties in flood forecasting to generate flood hazards maps that were combined based on exceedance probability scenarios. The purpose is to differentiate the impact of flooding depending on the building use. The aim of the study is thus to develop a novel methodology that uses a multi-model combination of flood forecasting models to generate flood hazard maps with differentiated exceedance probability. These maps take into account uncertainties steaming from the rainfall-runoff generation process and could be used by decision-makers for a variety of purposes in which the building use plays a significant role, e.g. flood impact assessment, spatial planning, early warning and emergency planning.

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“…It is convenient because the water level (z) is smaller when compared with the flood extent area (x, y). [53]. It is also possible to simulate using the diffusion wave equations to reduce the computational time of the model, but this would not then use the acceleration and pressure terms [54].…”

Section: Reflections On the Modelmentioning

confidence: 99%

A Semi Risk-Based Approach for Managing Urban Drainage Systems under Extreme Rainfall

Salinas-Rodriguez

Gersonius

Zevenbergen

et al. 2018

Water

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Conventional design standards for urban drainage systems are not set to deal with extreme rainfall events. As these events are becoming more frequent, there is room for proposing new planning approaches and standards that are flexible enough to cope with a wide range of rainfall events. In this paper, a semi risk-based approach is presented as a simple and practical way for the analysis and management of rainfall flooding at the precinct scale. This approach uses various rainfall events as input parameters for the analysis of the flood hazard and impacts, and categorises the flood risk in different levels, ranging from very low to very high risk. When visualised on a map, the insight into the risk levels across the precinct will enable engineers and spatial planners to identify and prioritise interventions to manage the flood risk. The approach is demonstrated for a sewer district in the city of Rotterdam, the Netherlands, using a one-dimensional (1D)/two-dimensional (2D) flood model. The risk level of this area is classified as being predominantly very low or low, with a couple of locations with high and very high risk. For these locations interventions, such as disconnection and lowering street profiles, have been proposed and analysed with the 1D/2D flood model. The interventions were shown to be effective in reducing the risk levels from very high/high risk to medium/low risk.

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A comparison of three dual drainage models: shallow water vs local inertial vs diffusive wave

Cited by 48 publications

References 42 publications

On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events

On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events

Hazard maps with differentiated exceedance probability for flood impact assessment

A Semi Risk-Based Approach for Managing Urban Drainage Systems under Extreme Rainfall

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