Author(s): V. G. Sanoyan; E. T. Djrbashian

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Abstract: Turbulent sill flows, which are usually formed in mountains, move in a seething state, so that hydraulic jamp is naturally formed at the sill reservoir inlet range. When the reservoir is filleingby water and solid material, the hydraulic jamp is being formed which moves upstream. It may seem at first sight that jamp displacement should take place continuously due to continuous rise of water level in the reservoir. However the calculations given below and experimental results show that jamp motion is discontinuous. During certain period of time the jamp is practically immovable (actually it moves slowly upstream), after that it suddenly it starts off, moves for some distance with wave velocity, and again stops. This process is repeated periodically, until the conditions are created at the boundary inlet range, when the incoming stream from the bed, though still in a turbulent state, begins flowing about the initially formed part of the drift deposition layer. This may take place when the bed slope is gradoally increasing upstream.

DOI:

Year: 1995