Author(s): G. Rak; M. Hocevar; F. Steinman

Linked Author(s): Franc Steinman

Keywords: Laser scanning; Turbulent water surface; Free-water-surface topography; LIDAR; Supercritical flow

Abstract: Laser scanning enables measurements of complex morphology with high temporal and spatial resolution. In our study this non-intrusive measurement method was successfully used for measurements of non-stationary free-water-surface topography. Broad applicability of laser scanning is shown particularly in measurements of solid objects, regardless of the complexity of surface morphology. With their experiments some authors have already confirmed the usefulness of the LIDAR method for measuring water surface profiles, by adding particulate matter to improve reflectivity. In this study the measurement method has proven to be very promising also in highly aerated flow. In comparison with conventional methods for measurements of water levels, laser scanning shows a significant advantage, particularly in cases with complex water surface topography, like turbulent two-phase flows with high vertical dynamics. Despite the fact that LIDAR devices measure with high spatial and temporal resolution, relatively extensive measurement sets are required to establish the exact profile of the water surface. Due to the specificity of the interaction between the light signal of the LIDAR device and water, the number of successfully measured points of water surface is relatively low. In highly aerated flow, profiles can be measured very accurately, even in cases of turbulent, complex flows with high vertical fluctuations of water surface.

DOI: https://doi.org/10.3850/978-981-11-2731-1_059-cd

Year: 2018