SPECIALITY OF LOW RELEASE CALCULATIONS ON SMALL RIVERS ON THE EXAMPLE OF THE OREDEZH RIVER

Section
Monitoring, experimental and expeditionary research
  • Alexey Yu. Vinogradov Scientific and Industrial Research Association Gidrotehproekt, Valday, Russia; Saint Petersburg State Forest Technical University, St. Petersburg, Russia
  • Tatiana А. Vinogradova Scientific and Industrial Research Association Gidrotehproekt, Valday, Russia; 2Saint Petersburg State Forest Technical University, St. Petersburg, Russia; Saint Petersburg State University, St. Petersburg, Russia
  • Viktor A. Obyazov Scientific and Industrial Research Association Gidrotehproekt, Valday, Russia
  • Vitaly А. Khaustov Russian State Hydrometeorological University, St. Petersburg, Russia
  • Ivan А. Vinogradov
Keywords: simulation of water discharge and water levels, release on a small river, release wave velocity, unsteady motion equation, Lagrange formula, Institute of Hydrodynamics numerical method

The article regards the movement of the negative and positive release waves from the reservoir on the Oredezh River. There was a model of unsteady water motion used for calculation the spread of the release wave. The release was conducted on 06/19/2017 and consisted of three phases. In the first phase, the gate was closed and the water discharge fell from 3.6 to 2.5 m3/s. An hour later the gate was raised and during a half an hour water was released with an average flow rate of 4.2 m3/s. There were 7 points organized to monitor the dynamics of water levels in the river. They were located at a distance of 91.5 to 2443 m from the dam. The observation interval was 1 minute on most targets.

There is advisable to use a one-dimensional model of unsteady water motion (Saint-Venant equation) for calculating small release waves of slowly changing unsteady water motion in cases where topographic materials are available. This allows to determine the stream features over the whole considered river extension. The system of difference equations is solved by the tridiagonal matrix algorithm. The values of the water discharge and water levels for the next estimated time interval are obtained along the entire channel as a result of this shuttle.

The experiment indicated that the used model makes it possible to calculate the unsteady water movement on small rivers with releases comparable to the initial water discharge and even less. The maximum variences between the measured and calculated water levels during the negative wave did not exceed 15.0 cm, and the positive one – 4.0 cm.

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Published
2020-04-07
How to Cite
Alexey Yu. Vinogradov, Tatiana А. Vinogradova, Viktor A. Obyazov, Vitaly А. Khaustov, & Ivan А. Vinogradov. (2020). SPECIALITY OF LOW RELEASE CALCULATIONS ON SMALL RIVERS ON THE EXAMPLE OF THE OREDEZH RIVER. Hydrosphere. Hazard Processes and Phenomena, 2(1), 71-81. https://doi.org/10.34753/HS.2020.2.1.71

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