An Analysis of LSPIV‐Based Surface Velocity Measurement Techniques for Stormwater Detention Basin Management

Abstract

Stormwater detention basins are significant components for the sustainable management of urban stormwater, aiming to control stormwater quantity (prevent from flooding) and quality (trap particulate pollutants by settling). The design and management of such facilities need knowledge of the hydrodynamic characteristics and the sedimentation zones for cleaning purposes. Large-scale particle image velocimetry (LSPIV), mostly applied in riverine environments, has been proven as a low-cost, highly efficient, and convenient image-based methodology for surface velocity measurement. In this study, LSPIV technology is employed to investigate free surface velocity in a field stormwater detention basin. The method is first evaluated by comparing its results with those obtained by acoustic Doppler velocimeter at pilot scale. Then, the technique is applied to better understand the main flow field and to explain spatial sediment distribution within an extended stormwater detention basin. Results illustrate two main flow patterns, which are consistent with observations and preliminary simulated results. LSPIV-based free surface velocity field measurements can be used to evaluate numerical models and as a support to predict sediment deposition zones in stormwater detention basins and to help for their retrofit and management.

Laboratory modelling of urban flooding

“…The recorded sequences were processed with the open-source software Fudaa-LSPIV 19 – 21 following three main steps to calculate the surface velocity: (i) a 3-D orthorectification of the images was applied based on 10 to 20 ground reference points (GRP) placed at three vertical elevations ( z = 0 m, z = 0.15 m or z = 0.3 m, see yellow points in Fig. 6a ).…”

Combination of Lagrangian Discrete Phase Model and sediment physico-chemical characteristics for the prediction of the distribution of trace metal contamination in a stormwater detention basin

“…Our work was conducted in the Django Reinhart stormwater detention basin (DRB), which remains dry during dry weather. The DRB is a part of the broader facilities investigated within the framework of the Field Observatory for Urban Water Management (or OTHU in French, http://www.graie.org/othu/ -see also Zhu and Lipeme Kouyi, 2019). Fig.…”

Free-Surface Velocity Measurement Using Direct Sensor Orientation-Based STIV

“…The detection error will be significantly amplified when applied to a large-scale area [ 17 ]. Currently, the commonly used velocity calibration scheme is based on variable height homography (VHH) [ 7 , 18 , 19 , 20 ]. It improves the measuring precision of bank-based large-scale PIV (LSPIV) systems with small shooting angles by considering the distance from GCPs to the free surface, as well as modeling the elevation of the camera with the water level and the river slope.…”