Exchange between drainage systems and surface flows during urban flooding: Quasi-steady and dynamic modelling in unsteady flow conditions

JOURNAL OF HYDROLOGY

卷:602

Article

Kitsikoudis, Vasileios¹  Erpicum, Sebastien²  Rubinato, Matteo^3,4  Shucksmith, James D.⁵  Archambeau, Pierre²  Pirotton, Michel²  Dewals, Benjamin² 

[1] Univ Twente, Fac Engn Technol, Water Engn & Management, Enschede, Netherlands

[2] Univ Liege, Urban & Environm Engn, Hydraul Environm & Civil Engn, B-4000 Liege, Belgium

[3] Coventry Univ, Fac Engn Environm & Comp, Sch Energy Construct & Environm, Coventry CV1 5FB, W Midlands, England

[4] Coventry Univ, Ctr Agroecol Water & Resilience, Wolston Lane, Coventry CV8 3LG, W Midlands, England

[5] Univ Sheffield, Dept Civil & Struct Engn, Mappin Bldg, Sheffield S1 3JD, S Yorkshire, England

关键词: Sewer/surface flow interactions;    Urban flood modelling;    Drainage systems;    Head losses;    Unsteady flow;    Urban hydraulics;   

DOI  :  10.1016/j.jhydrol.2021.126628

来源: Elsevier

【 摘 要 】

The accurate modelling of urban flooding constitutes an integral part of flood risk assessment and management in residential and industrial areas. Interactions between drainage networks and surface runoff flows are commonly modelled based on weir/orifice equations; however, this approach has not been satisfactorily validated in unsteady flow conditions due to uncertainties in estimating the discharge coefficients and associated head losses. This study utilises experimental data of flow exchange between the sewer flow and the floodplain through a manhole without a lid to develop two alternate approaches that simulate this interaction and describe the associated exchange flow. A quasi-steady model links the exchange flow to the total head in the sewer pipe and the head losses in the sewer and the manhole, whilst a dynamic model takes also into account the evolution of the water level within the manhole at discrete time steps. The developed numerical models are subsequently validated against large-scale experimental data for unsteady sewer flow conditions, featuring variable exchange to the surface. Results confirmed that both models can accurately replicate experimental conditions, with improved performance when compared to existing methodologies based only on weir or orifice equations.

【 授权许可】

Free