NUMPIERS DB

======= NUMPIERS - Numerical and Experimental study of the flow around complex bridge piers ======= ======Experimental study====== Objective: Three-dimensional characterization of the scour cavity geometry development around a complex bridge pier ===== Experimental facility ===== A set of 15 experiments were performed in a 32.2 m long and 1 m wide recirculation flume, located in the Hydraulics Laboratory of the Faculty of Engineering of the University of Porto (FEUP). Longitudinal view of the experimental setup (dimensions in meters): {{:longitudinal_view.gif?nolink |}} - **Glass side-walls**: to enable the visualization of the flow; - **Sediment boxes**: __sand pit__ (complex pier was installed) and __sand trap__ (eroded sediments were retained). ===== Complex pier model ===== Geometric charcateristics and position relative to the initial riverbed of the complex pier (dimensions in meters): {{:complex_pier1.gif?nolink |}} - **Pier components:** * Column: acrylic glass * Pile cap: acrylic glass * 4 Cylindrical piles foundation: PVC material ===== Sand characteristics ===== * Gradation coefficient: σd = 1.4 * Median diameter: D50 = 0.86 mm * Sand density: ρ = 2650 kg/m3 ===== Inflow conditions ===== * Flow depth: h = 0.18 m * Inflow discharge: Q = 0.059 m3/s * Approach flow velocity: u = 97% uc (0.327 m/s) ===== Experimental measurements ===== * __Measurement of the scour depths at different positions__: * at the pile cap front (by means of a limnimeter); * at each individual pile foundation (by reading off the scale attached). * __Spatial characterization of the scour cavity geometry__: by means of close-range photogrammetry. {{:photogrammetry2.gif?nolink |}} - **Photogrammetric apparatus in the laboratory:** * Limnimeter measurement point (cross); * Ground control points (circles); * Camera captures (squares). ===== Available measurements ===== * Bed profiles along the centerline of the complex pier: {{:bed_profiles.7z|}} * Digital Elevation models (DEM) of the scour cavity: {{:dem_xyz.7z|}} * End experiment (11 days): Scour depth evolution at the pile cap front and at the piles front:{{:scour_depths_t.7z|}} * Relation between maximum scour depth and volume rates to the end experiment: {{:v_ve_t_te_ds_dse.7z|}} * Cavity's volume scour rate time evolution: {{:v_ve_t_te_ds_dse.7z|}}