Climate Variability and Change—Hydrological Impacts (Proceedings of the Fifth FRIEND World Conference held at Havana, Cuba, November 2006), IAHS Publ. 308, 2006, 139–144.

---

Temporal and spatial variability of drought in mountain catchments of the Nysa Klodzka basin

TAMARA TOKARCZYK¹ & WOJCIECH JAKUBOWSKI²

1 Institute of Meteorology and Water Management, Parkowa 30, 51-616 Wroclaw, Poland

tamara.tokarczyk@imgw.pl

2 Agricultural University of Wrocław, CK Norwida 25/27, 50-375 Wroclaw, Poland

Abstract This paper presents drought assessments on the basis of a climatic water balance and with the application of a three-parameter model of hydrological drought. Analysis of the spatial range and temporal variability of drought phenomena was carried out for the Nysa Klodzka River basin for 1951–2003. The crucial information for hydrological drought assessment delivers the probability of low flow extreme. The low flow extreme characterizes the maximum deficit volume and duration. The two dimensional Bivariate Generalized Pareto Distribution (BGPD) was applied to estimate the extreme values of the low flow deficit volumes and duration probabilities.

Key words Nysa Klodzka River, Poland; drought; climatic water balance; low flow extreme; Bivariate Generalized Pareto Distribution

---