Abstract

Present work is devoted to the river banks local scour investigation. Experimental and theoretical results are introduced. Two mathematical models for forecasting of bottom rearrangement of the river in a zone of local deformations are offered – one for relatively homogeneous small sand particles, another – for no-homogeneous ground with the accounting of critical conditions for single bottom particle stability. The role of screw currents is emphasized in the phenomenon of a flow dumping, in spur-dikes work, and also in formation of local erosion zones. The adjusted technique of bottom local deformations account was suggested on the base of the given research. The possible ways of influence on natural river-bed processes also are examined. The recommend-ations are given for spur-dikes designing.

Keywords: local scores, the scheme of river-bed regulation, dumping of a flow, bottom particle stability, critical conditions, spur-dikes, sediment regulation