title: The use of CFD modelling to optimise measurement of overflow rates in a downstream-controlled dual-overflow structure.
abstract: The measurement of the flow through complex combined sewer overflow structures in the frame of automated monitoring remains difficult. In this paper, a methodology based on the use of computational fluid dynamics (CFD) modelling in order to improve the instrumentation of a downstream-controlled dual-overflow structure is presented. The dual-overflow structure is composed of two combined sewer overflows (CSOs) connected by a rectangular channel and controlled by a downstream gate located at the entry of the Meyzieu waste water treatment plant (close to Lyon, France). The analysis of the CFD results provides: (i) a better understanding of the interaction between the two CSOs--that means the hydraulic operation, the hydrodynamic behaviour, the backflow effect--and (ii) an ability to optimise the location of the water depth sensor. The measured water depth is used to assess the overflow rate by means of a numerical relationship. Uncertainties are also assessed.
authors.affiliation: Université de Lyon, F-69000 Lyon, France. gislain.lipeme-kouyi@insa-lyon.fr
authors.forename: G Lipeme
authors.initials: GL
authors.lastname: Kouyi
authors.forename: P
authors.initials: P
authors.lastname: Bret
authors.forename: J-M
authors.initials: JM
authors.lastname: Didier
authors.forename: B
authors.initials: B
authors.lastname: Chocat
authors.forename: C
authors.initials: C
authors.lastname: Billat
mesh_terms: D008962:Models, Theoretical; D014872:Water Movements