Freely available daily hydrometeorological data from Czechia: further insights

Abstract

Abstract. Quite recently, freely available mean daily discharge series representing the territory of Czechia were complemented by ten daily series of nine climate variables, spanning usually from 1961 to the present. Their length thus allows the analyses similar to those conducted approximately a year ago in relation to the long series of discharge. Besides this possibility, the current paper goes further and shows how these long series (including discharge) can be used in order to assess the presence of the so-called Hurst phenomenon. Using a wavelet-based approach, several important differences in the wavelet spectra and values of the Hurst exponent (as well as the uncertainty in their estimation) were found when focusing on discharge, air temperature and precipitation. Furthermore, using the stationarity and unit root tests, it was revealed that, unlike precipitation, air temperature and discharge series may be characterized by long-memory processes in many cases. Finally, as the paper is devoted mainly to students, a short R script is presented in Appendix that makes it easier to work with the online files offered by Czech climatologists.

Long-term persistence in discharge time series of mountainous catchments in the Elbe River basin

“…Furthermore, it was found that many series involving indices related to hydrological drought in Czechia reveal high values of H as well, which was confirmed by unit root tests. On the other hand, precipitation series in Czechia for the period 1961-2012 showed no LTP (Ledvinka, 2015c). The differences between discharge and climate variables from this point of view, using selected stations within the Czech part of the Elbe basin, were highlighted also in Ledvinka and Jedlicka (2018).…”