Construction of water surface topography using LIDAR data

Rak, Gašper (author), Hočevar, Marko (author), Steinman, Franci (author)

Measurements of water surface topography are important for hydraulic structures, operation of hydropower plants as well as in the determination of water surface profiles in rivers, especially in the event of high waters. We therefore investigated the conditions at a confluence of two supercritical flows, where distinctly three-dimensional flow conditions of standing waves form, as well as an unsteady structure of the water flow in transversal and longitudinal directions. Due to the fast water surface dynamics and the phenomenon of foamed or twophase flow, the conventional measurement methods typically used in hydro engineering are not suitable for capturing complex water surface topography with high temporal and spatial resolution. Hence we wanted to verify the appropriateness of the laser scanning method for water surface topography measurements. This measurement method, which is considered less suitable or even useless for measurements of water body surfaces, was, coupled with an innovative approach, successfully used for water surface measurements of dynamic, turbulent, two-phase water flow. The acquisition of a point cloud with high temporal and spatial resolution allows for the construction of topography of intensive waving, which will also enable a topology analysis based on a phenomenological analysis of the relations between integral parameters of water flows and standing wave characteristics at the confluence.

• Language: English
• Keywords: laser scanner, water surface, topography, two-phase flow, confluence
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2018
• Number of pages: Str. 555-565
• Numbering: Vol. 64, no. 9
• PID: 20.500.12556/RUL-126378
• UDC: 626/627
• ISSN on article: 0039-2480
• URN: URN:NBN:SI:doc-9XCVL2A1
• DOI: 10.5545/sv-jme.2017.4619
• COBISS.SI-ID: 8451937
• Publication date in RUL: 19.04.2021

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [etc.], = Association of Mechanical Engineers and Technicians of Slovenia [etc.
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Secondary language

• Language: Slovenian
• Title: Izdelava topografije vodne gladine z uporabo LIDAR podatkov
• Keywords: lasersko skeniranje, vodna površina, topografija, dvo-fazni tok, sotočje