1. Hydrologidagarna, March 2014
Hydroclimatic change driven by land-water use developments in transboundary Sava River Catchment and across regions
Lea Levi
Hydrologidagarna, March 2014

2. OBJECTIVES
investigate the past-to-present hydroclimatic changes observed within the SRC
relate the observed hydro-climatic changes in the landscape to various possible change drivers, including atmospheric climate change and historic land/water-use developments in the region
compare and assess the possible generality of obtained SRC results for such relations in view of similar results in climatically different parts of the world.

3. Sava River Catchment (SRC)
92,158 km²
SRC

4. AVAILABLE INFORMATION
Temperature: CRU TS 2.1 data (Mitchell and Jones, )
Precipitation: CRU TS 2.1 data (Mitchell and Jones, )
Runoff: Institute for the development of the water resources Jaroslav Černi, Meteorological and Hydrological Institute of Croatia
Landuse: ISLSCP II Historical Land Cover and Land Use,
Hydropower: different sources

5. The total SRC area: 92,158 km², population 8 176 000
elevation: m a.s.l.
20th century averages:
Landuse:
Hydropower: Large dams, 22 hydropowerplants (annual production of 8*106 MWh)
Irrigation: % of the total water use in the catchment used for irrigation; 0.28 % of the SRC area systematically irrigated

6. METHODS Climate models
ΔS≈0, annual change in water storage over the catchment
Budyko, (1974.)
Turc, (1954.)
Langbein, (1949.)

7. Comparison of available R data with a corresponding climate-related change in R (ΔRclim)
R change being driven only by the AET change estimated by the climate-related AETTclim and AETBclim estimates.
Arora et. al., (2002)
β≥0 is a sensitivity factor related to PET/P. For PET/P<1, which applies for all the Sava catchments, β≈ PET/P.

8. SRC

9. a) b) c) d)
Zagreb

10. Slavonski Brod

11. Kozluk

12. SRC
Zagreb
Slavonski Brod
Kozluk

13. SRC
Zagreb
Slavonski Brod
Kozluk

14. SRC
SRC

15. SRC

17. CONCLUSIONS
significant and temporally sustained hydroclimatic shifts in AETwb/P to higher levels and CV(R) to lower levels simultaneous with higher hydropower production
observed atmospheric climate changes in T and P cannot explain these data-given hydroclimatic changes in the landscape
no sustained observed landuse changes

18. Hydropower production development - a proxy for various possible related and/or concurrent changes in land-use and water-use
consistent with previous such results (Destouni et al., (2013)) for hydropower catchments in Sweden and by extrapolation on average for such catchments in different parts of the world.
a possibility for cross-regional generalization of hydroclimatic change effects related to land-water-use

19. The SRC –transboundary, recently undergone political and social instability- less accessible environmental data.
a catchment-wise investigation approach
utilizing the fundamental water balance physics of hydrological catchments
comparing change results and implications across catchments of different scales and for different parts of the world.

20. Thank you!