title: Characterization of the hydraulic performance of a gully under drainage conditions.
abstract: During rainfall events with low return periods (1-20 years) the drainage system can provide some degree of protection to urban areas. The system design is based not only on good hydraulic performance of the surface and the sewer network but also on their linking elements. Although the linking elements are of utmost importance as they allow the exchange of flow between the surface and the sewer network, there is a lack of studies that thoroughly characterize them. One crucial structural part of those elements is the gully. State-of-the-art dual-drainage models often use simplified formulae to replicate the gully hydraulic behaviour that lacks proper validation. This work focuses on simulating, both numerically and experimentally, the hydraulic performance of a 0.6 × 0.3 × 0.3 [m] (L × W × D) gully located inside an 8 × 0.5 × 0.5 [m] rectangular channel. The numerical simulations are conducted with the OpenFOAM toolbox and validated with water level measurements in the Multiple-Linking-Element experimental installation located at the Laboratory of Hydraulics of the University of Coimbra. The results provide a complete three-dimensional insight of the hydraulic behaviour of the flow inside the gully, and discharge coefficient formulae are disclosed that can be directly applied in dual-drainage models as internal boundary conditions.
authors: Civil Engineering Department, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal E-mail: Ricardo.Martins@dec.uc.pt.
authors: Ricardo
authors: R
authors: Martins
authors: Civil Engineering Department, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal E-mail: Ricardo.Martins@dec.uc.pt; Institute of Hydrology, Water Management and Environmental Techniques, IA 01/34, Ruhr-University Bochum, 44780 Bochum, Germany.
authors: Jorge
authors: J
authors: Leandro
authors: Civil Engineering Department, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal E-mail: Ricardo.Martins@dec.uc.pt.
authors: Rita Fernandes
authors: RF
authors: de Carvalho
mesh_terms: D003198:Computer Simulation; D004323:Drainage, Sanitary / Q000379:methods*; D008962:Models, Theoretical; D011891:Rain; D014872:Water Movements