FIELD RESEARCH METHODS AND SOME RESULTS FOR DISTRIBUTION OF SUSPENDED SEDIMENT IN FLOW CONSTRAINED BY TRANSVERSE DAMS

The article presents methods for determining the main parameters of flow of medium hydraulic size sediment, turbidity, sampling methods in field and the instruments used for sampling, methods of processing the samples in laboratory. Methods for setting sections and gage points and conducting field and laboratory research have been developed for flow deformed by blank and through flow transverse dams, water surface longitudinal and transverse slope takes place in the flow constrained by transverse dams, changes in suspended sediment distribution occur inversely. Location of sections for sampling is determined in the article: in the headrace –beyond dam influence zone, maximal head, constraint, compression, spreading zones and at the end of vortex zone. No less than three verticals for sampling must be determined in order to set suspended sediment distribution in the turbulent mixing zone. Based on field experiments conducted on the Amudarya river on dam 30 turbidity interference has been proven to be in compliance with Schlichtings law.

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