Application Of Laser Scanning Techniques Research Articles

3-D Scale Model Study of Wave Run-Up, Overtopping and Damage in a Rubble-Mound Breakwater Subject to Oblique Extreme Wave Conditions

A set of scale-model tests carried out to enlarge the range of wave steepness values analysed in run-up, overtopping and armour layer stability studies, focusing on oblique extreme wave conditions and on their effects on a gentler slope breakwater’s trunk armour and roundhead, is presented in this paper. A stretch of a rubble mound breakwater (head and part of the adjoining trunk, with a slope of 1(V):2(H)) was built in a wave basin at the Leibniz University Hannover to assess, under extreme wave conditions (wave steepness of 0.055) with different incident wave angles (from 40º to 90º), the structure behaviour in what concerns wave run-up, wave overtopping and damage progression of the armour layer. Two types of armour elements (rock and Antifer cubes) were tested. Non-intrusive methodologies including a new application of laser scanning technique for the assessment of both armour layer damage and wave run-up and overtopping were used. It is expected that such work will contribute also with data to improve empirical formulas as well as to validate complex numerical model for wave-structure interaction.

Investigation on Different Scanning Resolutions for Slope Mapping Studies in Cameron Highlands, Malaysia

The development of laser scanning is one of the surveying methods, which able to produce a digital surface in a short period. The good results of digital surface must be followed by specific procedures, for example, interpolation algorithm and filtering methods. The improvement in information technology has influenced the growing development and application of laser scanning technique in order to fulfill the user needs. Laser scanning resolution might have an effect on the results of slope mapping studies. The objective of this paper is to evaluate the results of different laser scanner resolutions in producing a slope map. This study was conducted at Cameron Highlands, Pahang, Malaysia. Two site locations were identified for this study due to the condition of the slope characteristics that provides a more accurate assessment. Topcon GLS1500 is being used for data collection at both sites, and several control points were established using real-time kinematic global positioning system. The storage of point clouds was increased when the resolution value is decreased. The results of laser scanner were analyzed based on different laser scanner resolutions. It can be concluded that laser scanner resolutions do have an effect on slope mapping accuracies. Determination of the appropriate resolution for specific applications can be identified in this study.

METHODOLOGY DEVISING FOR BUCKET-WHEEL EXCAVATOR SURVEYING BY LASER SCANNING METHOD TO DETERMINE ITS MAIN GEOMETRICAL PARAMETERS

The application of laser scanning techniques to bucket-wheel excavator surveying seeks primarily to determine the machines’ key geometric parameters and to establish realistic mathematical descriptions of their movement dynamics in 3D space. The data will be used to visualize excavator movement and to control the coal extraction process in real time. The measurements take place at Doly Nástup Opencast Coal Mine, Tušimice, North-Bohemian Lignite Coal Field, Czech Republic. GNSS technology and inclinometric measurements are used to calculate 3D positions of the bucket-wheel excavators. The data is transferred to the research team workplace and stored in a database. KVAS software is used to visualise the bucket-wheel excavators and their 3D movements in real time.