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SPATIAL AND TEMPORAL VARIABILITY OF HYDROLOGICAL DROUGHT IN THE CZECH REPUBLIC
Abstract
We analyze long term series of mean monthly river runoff in the period 1931–2007 to characterize drought severity in 118 gauging stations across the Czech Republic. A threshold level method is employed using Q95 discharge as the threshold to identify periods during which the flow is below limit and thus considered as drought. We use both annual and monthly variable threshold. The drought parameters are the deficit volume and the duration. We observe the relation between deficit volume and the physical and geographical conditions of the river basin. The monthly series of deficit volume were analyzed by means of a modified non-parametric Mann-Kendall test. Mostly the decreasing trend was found meaning the tendency to less severe drought episodes at the present. To support this finding, we analyze a series from before 1900 as well. We also take notice of how dams of different primary function may affect the particular drought event. The aim of the analysis is to provide the basis for developing indices for hydrological drought severity definition that are to be used in the preparation of plans for drought impact mitigation.
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References9
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