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Institute of Hydraulic Engineering

Research: Hydraulic Laboratory

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Determination of possible colmation processes in the residual water channel of a hydropower plant
Project manager:Stefan Haun, Ph.D.
Deputy:Prof. Dr.-Ing. Silke Wieprecht, Dr.-Ing. Markus Noack
Research assistants:Dipl.-Ing. Lydia Seitz
Duration:1.8.2015 - 30.6.2016
Funding:TIWAG-Tiroler Wasserkraft AG

This project is part of the research area:
MMM- Monitoring, Measuring and Modelling


Publications: Link


The project focuses on a detailed assessment of substrate conditions in the residual water channel, in order to give qualitative statements concerning the condition of the river bed. The determination of the infiltrating mass, their grain size distribution and the infiltration depth is crucial for the determination of possible colmation processes. Four methods are combined to facilitate the detection of both exterior and interior colmation:

  • Mapping of zones with possible exterior colmation
  • Freeze-core sampling to determine the infiltration depth of fine sediments in the subsurface layer
  • Freeze-panel sampling to determine the percentage of fine sediments in the surface layer
  • Measurements of dissolved oxygen in the interstitial zone

  • For the project the studied river bed in the residual water channel will be compared with up- and downstream reference sections, in order to give qualitative statements regarding the state of colmation.