Analysis of flood occurrence seasonality on the Czech Republic territory with directional characteristics method

Abstract

Analysis of flood occurrence seasonality represents one of ambitious methodological approaches oriented towards enhancing knowledge on regime of these natural disturbances. Data from 181 gauging stations (out of them 108 in the Labe River Basin, 21 in the Odra River Basin and 52 in the Morava River and the Dyje River Basins) were applied for analysis on the Czech Republic territory. The input data were hood discharges represented by their daily averages within the reference period 1975-2000. Method of directional statistic was used to express spatial dissimilarity of hood occurrence seasonality. Output resulting from application of this method is determination of the flood occurrences mean day (MD) within the year in the examined river basin and furthermore the time dispersion index (r) of hood events. Based on these directional characteristics applied on sets of selected river basins, the Czech Republic territory can be divided into regions according to flood occurrence frequency in particular period of year