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Determinación de la rugosidad de lechos de grava mediante láser terrestre de alta resolución ( Analysis of alluvial bed roughness by means of Terrestrial Laser Scanning)
X Reunión Nacional de Geomorfología, Cádiz 2008 (2008)
  • D. Vericat
  • J. Brasington
  • Joseph M. Wheaton, Utah State University
  • I. Rychov
Abstract

We outline a methodology to derive local bed roughness from detailed 3D point cloud data, acquired using a terrestrial laser scanner (TLS) in a 1 km long study reach of the River Feshie. Unlike hand-held scanners, a TLS can be tripod mounted and acquire data over ranges exceeding 100 m and achieve data densities well above 1000 points/m2. In this study, a Leica ScanStation was deployed to acquire a point cloud comprising over 200 million points, with total RMS errors of 2-11 mm. An experimental design using a combination of grain-size counts and TLS data was developed to test a range of algorithms designed to retrieve patch-scale roughness metrics from the 3D point cloud. Results indicate that after local detrending, the standard deviation of elevations can be successfully correlated to ground mapping and offer potential for improved parameterization of hydraulic models.

Keywords
  • rugosidad,
  • grava mediante,
  • laser terrestre
Publication Date
January 1, 2008
Editor
BenaventeJ,; GraciaFJ
Citation Information
Poster: 2008. Vericat D‡, Brasington J, Wheaton JM and Rychov I. Determinación de la rugosidad de lechos de grava mediante láser terrestre de alta resolución. In: Benavente J and Gracia FJ (Eds), Trabajos de Geomorfología en España. Martínez Encuadernaciones A.G., S.L.: Cádiz, pp. 167-­‐170.