1. Climate change impact on mean annual river flows
M. Brilly*1, A. Horvat1,
D. Matthews2 and M. Šraj1
1University of Ljubljana, Faculty of Civil and Geodetic Engineering, Ljubljana, Slovenia
2Hydromet DSS, Silverthorne, US

2. Hydrogeological map

3. Terrain

4. Mean annual precipitation in Slovenia

5. River network

6. Watersheds contour lines

7. LANDSCAPE UNITS IN SLOVENIA
… the Alps
the Pannonian lowlands ...
… the Mediterranean
the Dinaric Karst ...

8. Slovene part of Sava River Basin with WatBal regions

9. Land surface characteristics of the Sava River subwatersheds, CORINE land cover

10. METHODS Discharge ratio calculation q = Q/AVERAGE(Q(1961-1990))
10 years average
Q(i)=AVERAGE (Q(i-9,i)
water balance modeling

11. 10 years average discharges ratio in the upper part of the River Basin

12. Sava River Basin

13. 10 years average discharges ratio in the Danube River Basin

14. RHEIN River

15. Colorado River Basin Allocation
Up Upper Basin: per Basin:
7.5 MAF allocated
51.75 % to Colorado
23.00 % to Utah
14.00 % to Wyoming
11.25 % to New Mexico
50,000 AF to Arizona
Lower Basin:
4.4 MAF to California
2.8 MAF to Arizona
0.3 MAF to Nevada II

16. AMAZON River

17. Long term variability

18. Global discharge variability

19. 10 years average discharges ratio of precipitation in Trieste and Ljubljana

20. Lowest yearly precipitation in Ljubljana

21. Highest yearly precipitation in Ljubljana

22. Discharge and precipitation

23. Forestation in Slovenia

24. Water balance of the Sava River - Šent Jakob

25. Water balance of the Ljubljanica River - Moste

26. Conclusion
There are no clear universal trends in the water regimes of the analyzed rivers in the past century or in past twenty years also. Large differences in trends occur even in nearby watersheds.
Similarity in discharge fluctuation is presented in the discharge regime along the river stream.
Climate change impacts are overloaded by other human impacts on water regime

27. Thank you for your attention!