Assessment of hydrological drought characteristics in the Yarra River catchment: a case study

Rahman, S, Jayasuriya, N and Bhuiyan, M 2017, 'Assessment of hydrological drought characteristics in the Yarra River catchment: a case study', Journal of Hydrology, New Zealand, vol. 56, no. 2, pp. 123-136.

Document type: Journal Article
Collection: Journal Articles

Title Assessment of hydrological drought characteristics in the Yarra River catchment: a case study
Author(s) Rahman, S
Jayasuriya, N
Bhuiyan, M
Year 2017
Journal name Journal of Hydrology, New Zealand
Volume number 56
Issue number 2
Start page 123
End page 136
Total pages 14
Publisher New Zealand Hydrological Society
Abstract Hydrological drought is defined by the substantial reduction of water in the hydrological cycle. This study applied the Standardised Hydrological Drought Index (SHDI) to evaluate hydrological drought events at various timescales (3, 6, 9 and 12 months) using streamflow data from the Yarra River Catchment in southeast Victoria, Australia. The easy application of the SHDI across time and space makes it a useful index for monitoring and assessing drought events. Different analysis timescales identified a different number of drought events. The longest timescale (12 months) detected a higher number of extreme drought events compared to the shortest timescale (3 months). Drought durations also changed as function of analysis timescales for the selected stations. The results showed that the peak drought intensities were not necessarily associated with the longest duration droughts, but rather drought events with comparatively short duration. The onset and end times of the drought events also varied with timescales. Finally, the SHDI threshold values were transformed into mean monthly streamflow threshold values, which are easy to use in real-time conditions for managing droughts. The longest timescale analysed (12 months) exhibited a higher threshold value as it more likely to include both dry and wet periods. Therefore, the selection of an appropriate timescale for data analysis is essential, as drought characteristics are highly influenced by the timescale. The findings from this study will assist water managers in developing appropriate drought mitigation strategies.
Subject Water Resources Engineering
Civil Engineering not elsewhere classified
Environmental Engineering Modelling
Keyword(s) Hydrological drought
Standardised Hydrological Drought Index
drought duration
drought intensity
Copyright notice © New Zealand Hydrological Society
ISSN 0022-1708
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