engleski

One-dimensional unsteady flow model in the non- prismatic Botonega channel

The Botonega channel, as a drainage-retaining channel of the Botonega accumulation is a typical and complex trapezoidal earth channel with inundations on both sides that can be found in most water-managing solutions in Croatia. Within hydraulic interrelationship research, this channel is appropriate for the performance of several series of water measurements with different discharges in unsteady conditions. This is particularly important for the analysed section of the Botonega drainage-retaining channel for practical reasons, that is, for the purpose of establishing the maximum capacity of the channel in terms of evacuation of high waters. On the basis of one-dimensional unsteady flow numerical model created in the software package MIKE11, we can determine all kinematical and dynamic characteristics of the Botonega channel and simulate or identify channel spillways. The article defines ruling equations for the modelling of 1D unsteady flow in the Botonega channel and the algorithm for determining the coefficient of roughness. Furthermore, the most frequent methods for defining numerical schemes for calculation of unsteady flow in the open hydraulics channels have been described too. The developed model of 1D unsteady flow in the non-prismatic Botonega channel represents the contribution to the development of hydraulic modelling in terms of the insurance of an adequate tool for the quantification and verification of the channel geometry change influence on the coefficient of roughness and thereby on the channel throughput.

the Botonega channel ; unsteady flow ; numerical model ; channel throughput ; coefficient of roughness

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