Print Email Facebook Twitter Sediment morphology and the flow velocity field in a gully pot Title Sediment morphology and the flow velocity field in a gully pot: An experimental study Author Rietveld, M.W.J. (TU Delft Sanitary Engineering) de Rijke, D. (TU Delft Sanitary Engineering) Langeveld, J.G. (TU Delft Sanitary Engineering; Partners4UrbanWater) Clemens, F.H.L.R. (Deltares; Norwegian University of Science and Technology (NTNU)) Date 2020 Abstract Urban runoff (re)mobilises solids present on the street surface and transport them to urban drainage systems. The solids reduce the hydraulic capacity of the drainage system due to sedimentation and on the quality of receiving water bodies due to discharges via outfalls and combined sewer overflows (CSOs) of solids and associated pollutants. To reduce these impacts, gully pots, the entry points of the drainage system, are typically equipped with a sand trap, which acts as a small settling tank to remove suspended solids. This study presents data obtained using Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) measurements in a scale 1:1 gully to quantify the relation between parameters such as the gully pot geometry, discharge, sand trap depth, and sediment bed level on the flow field and subsequently the settling and erosion processes. The results show that the dynamics of the morphology of the sediment bed influences the flow pattern and the removal efficiency in a significant manner, prohibiting the conceptualization of a gully pot as a completely mixed reactor. Resuspension is initiated by the combination of both high turbulent fluctuations and high mean flow, which is present when a substantial bed level is present. In case of low bed levels, the overlaying water protects the sediment bed from erosion. Subject 3D printingGully potHydraulicsLDAMultiphase flowPIVSPIVStereo photographyUrban drainage To reference this document use: http://resolver.tudelft.nl/uuid:095dadf1-b052-4dfb-a1df-a5b167d469b2 DOI https://doi.org/10.3390/w12102937 ISSN 2073-4441 Source Water, 12 (10), 1-26 Part of collection Institutional Repository Document type journal article Rights © 2020 M.W.J. Rietveld, D. de Rijke, J.G. Langeveld, F.H.L.R. Clemens Files PDF water_12_02937.pdf 10.03 MB Close viewer /islandora/object/uuid:095dadf1-b052-4dfb-a1df-a5b167d469b2/datastream/OBJ/view