Preprints
https://doi.org/10.5194/hess-2018-413
https://doi.org/10.5194/hess-2018-413
24 Aug 2018
 | 24 Aug 2018
Status: this discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.

Influence of measurement errors on the results of the Brutsaert–Nieber analysis of flow recession curves

Jacek Kurnatowski

Abstract. The classic analysis of river flow recession hydrographs Q(t) developed by Brutsaert and Nieber (1977) leads to the graphical representation of the relation ln(−dQ/dt) = ln[f(Q)] in a form of scattered points cloud. The paper presents the analysis of measurement errors of river flow values as one of possible factors generating this dispersion. The relevant numerical experiment shows the high similarity between the set of points obtained as a classic analysis result and the experiment output. It has been proved that constant time steps between consecutive flow measurements subject to random errors generate a systematic error of the analysis results and should be replaced by intervals of variable duration, resulting from the condition of constant stage/depth decrements.

Jacek Kurnatowski
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Jacek Kurnatowski
Jacek Kurnatowski

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Short summary
The classic analysis of river flow recession curves Q(t) developed by Brutsaert and Nieber (1977) leads to the graphical representation of the relation ln(−dQ/dt) = ln[f(Q)] in a form of scattered points cloud. The paper presents the analysis of measurement errors of river flow values as one of possible factors generating this dispersion. The relevant numerical experiment has been performed. Finally, the principles of field measurements aiming towards reduction of this scattering are given.