Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies

Karmacharya, Sanat Kumar; Ruther, Nils; Shrestha, Ujjwal; Bishwakarma, Meg Bahadur

doi:10.3390/w13070998

Open AccessArticle

Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies

¹

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), S.P. Andersens Veg 5, 7491 Trondheim, Norway

²

Hydro Lab Pvt. Ltd., GPO Box No 21093, Kathmandu 44600, Nepal

^*

Author to whom correspondence should be addressed.

Water 2021, 13(7), 998; https://doi.org/10.3390/w13070998

Submission received: 2 March 2021 / Revised: 25 March 2021 / Accepted: 29 March 2021 / Published: 5 April 2021

(This article belongs to the Special Issue Advances and Challenges in Hydropower)

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Abstract

The selection of instrumentation for data acquisition in physical model studies depends on type and resolution of data to be recorded, time frame of the model study, available instrumentation alternatives, availability of skilled personnel and overall budget of the model study. The available instrumentation for recording bed levels or three-dimensional information on geometry of a physical model range from simple manual gauges to sophisticated laser or acoustic sensors. In this study, Structure from Motion (SfM) technique was applied, on three physical model studies of different scales and study objectives, as a cheap, quicker, easy to use and satisfactorily precise alternative for recording 3D point data in form of colour coded dense point cloud representing the model geometry especially the river bed levels in the model. The accuracy of 3D point cloud generated with SfM technique were also assessed by comparing with data obtained from manual measurement using conventional surveying technique in the models and the results were found to be very promising.

Keywords: Structure from Motion; physical hydraulic model; river bed morphology; experiments; instrumentation; photogrammetry

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MDPI and ACS Style

Karmacharya, S.K.; Ruther, N.; Shrestha, U.; Bishwakarma, M.B. Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies. Water 2021, 13, 998. https://doi.org/10.3390/w13070998

AMA Style

Karmacharya SK, Ruther N, Shrestha U, Bishwakarma MB. Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies. Water. 2021; 13(7):998. https://doi.org/10.3390/w13070998

Chicago/Turabian Style

Karmacharya, Sanat Kumar, Nils Ruther, Ujjwal Shrestha, and Meg Bahadur Bishwakarma. 2021. "Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies" Water 13, no. 7: 998. https://doi.org/10.3390/w13070998

APA Style

Karmacharya, S. K., Ruther, N., Shrestha, U., & Bishwakarma, M. B. (2021). Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies. Water, 13(7), 998. https://doi.org/10.3390/w13070998

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Evaluating the Structure from Motion Technique for Measurement of Bed Morphology in Physical Model Studies

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