engleski

Discharge measurement in natural open stream flow using probability approach

This work presents effective methods of measuring discharge on the natural stream flow. During extreme hydrologic events such as floods, measuring the discharge can be problematic, therefore alternative methods of discharge determination should be considered. The goal of this work is determination of discharge by use of available emerging technologies such as radar and ADCP (Acoustic Doppler Current Profiler). The surface velocities obtained by radar were used to compute the vertical velocity distribution using the probability concept and finally to determine the discharge on the studied cross section. Verification of the results was conducted for the discharge measured by ADCP. The radar based current velocity meter used by measurements was WJ7661 RYUKAN and the ADCP was Workhorse Monitor by Teledyne RD Instruments. The discharge was computed by analytical method and by the integration of the 2D velocity distribution on the cross section given by linear vertical velocity distribution and vertical velocity distribution using the probability concept. The measured cross section was located at the Cetina River, Čikotina Ladja. The precent difference in stream flow at Čikotina Ladja ranged from 0% to 12.17% depending on the computation method applied and the calibration of entropy parameter. Results have shown that the probability approach by discharge measurement was able to provide satisfactory estimates of velocity profiles and discharge for the observed cross section.

Discharge; Radar; ADCP; Probability; Open stream flow; Surface-water velocity

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