Abstract
Abstract. Currently a new wave flume for hydraulic experiments near to prototype scale is under construction at Deltares. In the flume, modern measurement equipment will be installed. One of the potential sensor techniques is Terrestrial Laser Scanner (TLS) based range measurements of water waves. TLS range measurements are a very fast and accurate method for solid surfaces, providing temporal and spatial high resolution profile measurements. The conditions under which measurements of water surfaces with TLS are possible are however less well understood. The main objective of this work is to explore possibilities to apply TLS based range measurements of water waves in the new Delta Flume facility. Hence, influencing parameters on TLS based range measurements from water waves in the laboratory are identified from literature. The influencing parameters are further investigated in a test featuring the SICK LMS 511 and measuring the water surface in the 50 m TU Delft wave flume. Analysis of the results provides an insight into the possibilities and potential problems of the new measurement method. The obtained profile measurements from a originally straight still water surface showed a tendency to bend upwards at the side of the profile. For that reason a surface correction method based on the refraction of the laser beam when entering the water is elaborated. This method is part of the derived wave field reconstruction method. Finally, an optimized water wave measurement set-up for the new Delta Flume proposed.
Highlights
The need of protection against flooding is a crucial issue in the Netherlands and other low lying countries in the world
Several approaches to apply Terrestrial Laser Scanner (TLS) based range measurements to water waves in the coastal zone are reported by Maslov et al (2006) with the focus on the required laser power
A wooden mounting construction for the TLS device was adjusted on the sidewalls of the wave flume (Figure 3)
Summary
The need of protection against flooding is a crucial issue in the Netherlands and other low lying countries in the world. Conventional capacitance and resistance type of wave probes (Whittenbury et al 1959) are used to measure the water waves generated in the flume. They are considered an intrusive single point measurement. One of the potential sensor techniques is TLS based range measurement of water waves. Compared to conventional laboratory wave measurement devices (e.g. resistance wave probes), TLS based range measurements are considered non-intrusive profile measurements. Processing of the data gives an insight into the possibilities and potential problems of the new measurement method It reveals which steps of filtering, averaging and correction are necessary to reconstruct a wave field from the obtained data. The knowledge gained is transferred to the Delta Flume facility and an optimized TLS based measurement set-up for the Delta Flume is proposed
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