Evaluating the structure from motion technique for measurement of bed morphology in physical model studies

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish
Article number998
JournalWater (Switzerland)
Issue number7
StatePublished - 1 Apr 2021
Externally publishedYes


  • Experiments
  • Instrumentation
  • Photogrammetry
  • Physical hydraulic model
  • River bed morphology
  • Structure from Motion


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