Assessment of Hydrological Drought Revisited |
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Authors: | I Nalbantis G Tsakiris |
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Affiliation: | (1) Laboratory of Reclamation Works and Water Resources Management, School of Rural and Surveying Engineering, National Technical University of Athens, Athens, Greece |
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Abstract: | A variety of indices for characterising hydrological drought have been devised which, in general, are data demanding and computationally
intensive. On the contrary, for meteorological droughts very simple and effective indices such as the Standardised Precipitation
Index (SPI) have been used. A methodology for characterising the severity of hydrological droughts is proposed which uses
an index analogous to SPI, the Streamflow Drought Index (SDI). Cumulative streamflow is used for overlapping periods of 3,
6, 9 and 12 months within each hydrological year. Drought states are defined which form a non-stationary Markov chain. Prediction
of hydrological drought based on precipitation is also investigated. The methodology is validated using reliable data from
the Evinos river basin (Greece). It can be easily applied within a Drought Watch System in river basins with significant storage
works and can cope with the lack of streamflow data. |
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Keywords: | Hydrological drought Drought prediction SPI Markov chain Evinos basin |
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