ESTIMATION OF HYDRAULIC PARAMETERS OF ARMORED LAYER FORMING IN MOUNTAIN RIVERS AND STREAMS

The paper is a result of laboratory and field measurements. Hydraulic parameters of armoured layer forming can be described on basis of stochastic nature of bed load movement proposed by Gessler. Due to sheltering effect the Wang hiding factor can be implemented. Change of sieve curve after Bartnik described flood on the basis of data gathered in Carpathian Rivers and streams. The purpose of laboratory experiment was to describe the change of velocity profile and basic hydraulic parameters during armouring process. The calculation was verified in Krzczonowka and Tenczynski streams. The armouring process influences the conditions of flow. Velocity profile in Mountain Rivers depends on change of bed roughness, which causes rating curve change. Characteristics of bed load sieve curve and roughness Mean diameter, which characterizes bed load, varies during formation of an armoured layer. This process may be described by two curves: an initial curve for non-heterogeneous material and a final curve for heterogeneous material, in which the standard deviation of the sieve curve reaches δ=1.3 [Sentürk 1977]. When floods pass down rivers with polyfractional non