Naslov
The Impacts of Climate Change on River Regimes in the Croatian Part of the Danube River Basin

Autori
Čanjevac, Ivan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
HydroPredict'2012 Volume of Abstracts / Nachtnebel, Peter i Kovar, Karel - Beč : IWHW, BOKU, 2012, 46-47

Skup
HydroPredict'2012 3rd International Interdisciplinary Conference on Predictions for Hydrology, Ecology and Water Resources Management: Water Resources and Changing Global Environment

Mjesto i datum
Beč, Austrija, 24.09.2012. - 27.09.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
climate change; Danube River basin; discharge; discharge regime; Croatia

Sažetak
Global climate change/variability in the last 30 years has been manifested mainly through average annual temperature rise, resulting in evapotranspiration and precipitation pattern change. Those changes have spatially different impact on river (discharge) regimes. An analyze of changes in discharge and discharge regimes of rivers in the Croatian part of the Danube river basin was made. The research area covers around 60 % of Croatia with around 2/3 of total number of inhabitants. The area has a very well developed surface drainage network with major rivers Danube, Sava, Drava, upper part of Kupa flowing marginal. To assess the change in regimes, comparison of module (Pardé) coefficients between the standard thirty years time period (1961-1990) and the last twenty years period (1990-2009) was done for selected 16 stations with homogeneous data series. In addition, Kendall-Theil (Sen) non-parametric trend test was carried for the yearly and seasonal values of discharge for the 50-year and 20-year period. Results show changes on all analyzed rivers and stations. In the last fifty years all analyzed rivers have a decrease in mean annual runoff (exceptions are Ilova and Bijela river with the moderate increase). There is an evidence of redistribution of discharge throughout the year, increase of spring and winter discharge (especially on rivers dominantly fed by snowmelt) and decrease of summer values of discharge. In addition, we detected the change in the month of the appearance of discharge maxima and minima. This is more evident on smaller lowland rivers. In most cases above mentioned changes can be described through changes in regime of climate elements (temperature, precipitation, evapotranspiration). We also found some signals of intensification of processes in the last 20 years. Further analyzes should focus on the catchment scale in order to assess all relevant natural and antropogenic factors influencing changes in the discharge regime of each river.

Izvorni jezik
Engleski

Znanstvena područja
Geografija

POVEZANOST RADA