OPTICAL MEASUREMENT METHOD FOR QUANTIFYING SEDIMENT TRANSPORT IN PHYSICAL EXPERIMENTS

Stefan Schäfer, Mathias Schlagenhauser, Peter Rutschmann

Research output: Contribution to journalConference articlepeer-review

Abstract

The authors present a measurement method that makes it comparatively inexpensive to carry out continuous measurements of sediment transport and display them in real time with very little computing power. The measurement method is part of a system for the continuous diversion or recirculation of sediments discharged from a flume or a laboratory canal. The core of the measurement method is a camera-optical gray value comparison of 8-bit grayscale images of a transparent measuring field, taken with a standard industrial camera. The measuring field consists of two transparent glass plates, one above the other, with a thin film of particle-laden liquid flowing between them (e.g. sand grains or plastic granulate in water). For each image, the concentration of the sediment in the liquid at a discrete point in time is first determined with the help of gray value comparison. The sediment transport ṁs [kg/s] derives from a calibration function, which was determined in advance from long-term measurements with several constant sediment concentrations. Comparative validation measurements showed measurement errors of around 5 percent for sediment concentrations between 0 and 20 percent.

Original languageEnglish
Pages (from-to)783-792
Number of pages10
JournalProceedings of the IAHR World Congress
DOIs
StatePublished - 2019
Event38th IAHR World Congress, 2019 - Panama, Panama
Duration: 1 Sep 20196 Sep 2019

Keywords

  • calibration
  • optical measurement
  • physical experiments
  • reservoir management
  • sediment transport

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