[ << Band/volume 13 ] [ Freiburger Schriften zur Hydrologie ] [ >> Band/volume 16 ] Band/volume 15: STAHL K. (2001):Hydrological Drought - a Study across EuropeAiming
at a better understanding of drought causes and processes, the present
study investigated hydrological drought characteristics in space and time
and their large-scale atmospheric driving forces in Europe. On the basis
of daily streamflow data of more than 600 European rivers for 1962-1990,
two types of events were defined: streamflow drought, defined by a seasonally
constant threshold and streamflow deficiency, defined by a new varying
threshold level method. By the means of cluster analysis, the 602 streamflow
deficiency series across Europe were classified into 19 regions. A regional
streamflow deficiency index (RDI) provided a parameter describing how
strong a region is affected by streamflow deficiency. This index allowed
a first assessment of the space-time characteristics of the major dry
spells in Europe in 1962-90. Regions such as Spain, SE-UK, S-Scandinavia
and N-Germany show a tendency to persistent dry spells while the index
fluctuates more strongly in other regions.
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