TY - JOUR
T1 - Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume
AU - de Ruijsscher, T. V.
AU - Hoitink, A. J.F.
AU - Dinnissen, S.
AU - Vermeulen, B.
AU - Hazenberg, P.
N1 - Funding Information:
This research is part of the research programme RiverCare, supported by the Dutch Technology Foundation STW, which is part of the Netherlands Organization for Scientific Research (NWO), and which is partly funded by the Ministry of Economic Affairs under grant number P12–14 (Perspective Programme). The data and scripts used in this study are publicly available online on http://hdl.handle.net/10411/ YACJ6D. The numerical implementation of the LOESS algorithm in Matlab and C11 is open source and can be found on https:// github.com/bartverm. The authors thank Associated Editor Charles Luce as well as Andrés Vargas-Luna and two anonymous reviewers for their comments, that helped improving the manuscript.
Publisher Copyright:
© 2018. The Authors.
PY - 2018/3
Y1 - 2018/3
N2 - A new measurement method for continuous detection of bed forms in movable bed laboratory experiments is presented and tested. The device consists of a line laser coupled to a 3-D camera, which makes use of triangulation. This allows to measure bed forms during morphodynamic experiments, without removing the water from the flume. A correction is applied for the effect of laser refraction at the air-water interface. We conclude that the absolute measurement error increases with increasing flow velocity, its standard deviation increases with water depth and flow velocity, and the percentage of missing values increases with water depth. Although 71% of the data is lost in a pilot moving bed experiment with sand, still high agreement between flowing water and dry bed measurements is found when a robust LOcally weighted regrESSion (LOESS) procedure is applied. This is promising for bed form tracking applications in laboratory experiments, especially when lightweight sediments like polystyrene are used, which require smaller flow velocities to achieve dynamic similarity to the prototype. This is confirmed in a moving bed experiment with polystyrene.
AB - A new measurement method for continuous detection of bed forms in movable bed laboratory experiments is presented and tested. The device consists of a line laser coupled to a 3-D camera, which makes use of triangulation. This allows to measure bed forms during morphodynamic experiments, without removing the water from the flume. A correction is applied for the effect of laser refraction at the air-water interface. We conclude that the absolute measurement error increases with increasing flow velocity, its standard deviation increases with water depth and flow velocity, and the percentage of missing values increases with water depth. Although 71% of the data is lost in a pilot moving bed experiment with sand, still high agreement between flowing water and dry bed measurements is found when a robust LOcally weighted regrESSion (LOESS) procedure is applied. This is promising for bed form tracking applications in laboratory experiments, especially when lightweight sediments like polystyrene are used, which require smaller flow velocities to achieve dynamic similarity to the prototype. This is confirmed in a moving bed experiment with polystyrene.
KW - LOESS
KW - bed level monitoring
KW - dune tracking
KW - line laser scanner
KW - physical scale model
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U2 - 10.1002/2017WR021646
DO - 10.1002/2017WR021646
M3 - Article
AN - SCOPUS:85044211170
VL - 54
SP - 2078
EP - 2094
JO - Water Resources Research
JF - Water Resources Research
SN - 0043-1397
IS - 3
ER -