Measurement of gravel-bed topography: an evaluation study applying statistical roughness analysis

Show simple item record Bertin, Stephane en Friedrich, Heide en
dc.contributor.editor ASCE en 2016-12-15T01:02:05Z en 2014-03 en
dc.identifier.citation Journal of Hydraulic Engineering 140(3):269-279 Mar 2014 en
dc.identifier.issn 0733-9429 en
dc.identifier.uri en
dc.description.abstract In this two-part study, experiments are conducted to evaluate available topography measurement techniques for gravel beds in a laboratory flume and to study their suitability for statistical roughness analysis. The available instruments for this study include (1) an acoustic bed profiler; (2) a hand-held laser scanner; and (3) two digital consumer cameras forming a stereophotogrammetric system, and are employed to obtain digital elevation models (DEMs) of water-worked gravel beds. In the first part of the study, the three measurement techniques are reviewed and their feasibilities for future grain-scale roughness work assessed, based on the obtained elevation datasets. Water-worked gravel-bed topographies are measured with all three available measurement techniques. The analysis of the DEMs concentrates on using probability distribution functions (PDFs) and second-order structure functions of bed elevations. Roughness coefficients are determined and used as a benchmark for comparison of the three measurement techniques. Although, visually, differences in the DEMs obtained with different measurement techniques are observed, the results of the chosen statistical analysis do not disclose the visual differences to the same extent. It is shown that the used stereophotogrammetric system, although theoretically allowing a fast and high-resolution recording process, lacks behind in accuracy. Thus, the second part of the study identifies and presents steps to improve the quality of the obtained stereophotogrammetric DEMs. A checklist is provided, highlighting the improvements made in the follow-up study, in order to obtain a high-quality stereophotogrammetric DEM. The overview will be useful for other researchers to make use of available low-cost and high-quality consumer camera equipment, to setup their own, non-proprietary stereophotogrammetric system. en
dc.publisher American Society of Civil Engineers en
dc.relation.ispartofseries Journal of Hydraulic Engineering en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Measurement of gravel-bed topography: an evaluation study applying statistical roughness analysis en
dc.type Journal Article en
dc.identifier.doi 10.1061/(ASCE)HY.1943-7900.0000823 en
pubs.issue 3 en
pubs.begin-page 269 en
pubs.volume 140 en
dc.rights.holder Copyright: American Society of Civil Engineers en
pubs.end-page 279 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 425829 en Engineering en Civil and Environmental Eng en
dc.identifier.eissn 1943-7900 en
pubs.record-created-at-source-date 2014-02-10 en 2013-09-07 en

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