Climatological evaluation of drought on the territory of Bohemia and Moravia in the years 1875 - 2002

Petr Blinka Climatological evaluation of drought on the territory of Bohemia and Moravia in the years 1875-2002 thesis Abstract The thesis arose with the support of the project "Long-term changes in the regime of occurrence of extreme drought in Czechia". The drought evaluation was based on 8 weather stations which were chosen according to the length of their measurement. They represent the climate of lower and central positions. Two main aims are followed: quantification of drought severity in calendar units (years, vegetation seasons - months April till September) and determining of most considerable dry spells. Beside two new indices DI and EvaDI the drought severity was also quantified by EDI which is based on the concept of the effective precipitation method proposed by H. R. Buyn a D. A. Wilhite. We paid special attention to the weather station Prague-Klementinum for which we estimated values of daily potential evapotranspiration. We used these estimates together with daily precipitation values for calculation of three other new drought indices EDImod, EDI2 and EvaDI2. We determined the most considerable dry spells by using the effective precipitation method. We also tried to identify dry spells which occurred at the same time at all weather stations. At the weather station Prague-Klementinum we..