HIDROENERGIA 2008 Bled, 12-13 June 2008
AN INTERDISCIPLINARY APPROACH FOR EVALUATION OF ENVIRONMENTAL FLOW REQUIREMENTS FOR sHPP IN SLOVENIA Nataša SMOLAR-ŽVANUT, PhD Darko BURJA, Bsc Civ Ing ALIDA REJEC, Msc Civ Ing
1. INTRODUCTION 2. EF ASSESSMENT 3. REVIEW OF EF IN SLOVENIA 4. CASE STUDIES 5. CONCLUSIONS
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1980 s project 100 new SHPP– financial support from goverment
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1995-2006: 1st or 2nd eco-morphological class
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WFD 2000 (2000/60/EC): good ecological status / ecological potential EU Directive (2001/77/EC) on promotion of Electricity from Renewable Energy Sources SHPP: 457 SHPP on streams and rivers
Small effect?
1. INTRODUCTION Inadequate water management practices: WATER ABSTRACTION
HYDROLOGY MORPHOLOGY
PHYSICO-CHEMICAL PARAMETERS BIOLOGY RIPARIAN ECOSYSTEM
AQUATIC ECOSYSTEM
Damming
Sediment transfer Flow regime Phy-Chm parameters Water quality Sediment structure River morphology Phytobenthos Macrophytes
Zoobenthos Fish
Environmental problems
Water abstraction
0,015 m3/s
0,776 m3/s
0,235 m3/s
3,25 m3/s
Rapid
Run
Riffle
Glide
Ponded
0,776 m3/s Run
Pool
0,015 m3/s
Comparison in mesohabitats between 2005 and 2006
Average water width /river width (%)
No. of mesohabitats/km Mean water width (m) Q (m3/s)
2005 B1 43 9.20 0,776
B2 81 3.15 0,015
2006 B1 19 9.30 3,250
B2 38 6.40 0,235
B1
100
B2 80 60 40 20 0 2005
2006
Year
The objective environmental flow EF quantity and quality of water ensuring the preservation the aquatic ecosystem: structure and function water body sections of water body Background: Water Act 2002
- WFD - WFD and hydromorphological pressures, 2006 - WFD and HPP, 2007 - FAO Fisheries Report No.821 ... - Brisbane declaration, 2007
The important part of RBMP and main contribution to
river revitalisation
2. EAF ASSESSMENT Process • definition the objectives: status of the river • definition of starting points, instream values, water abstraction scenarios • evaluation of critical parameters
Result Flow regime which has to be ensure at the river section: Morphology, habitats, aquatic and riparian flora and fauna
EF
EF
EF
Methods for EF determination: 1. Hydrological methods look up tables, indices
2. Hydraulic rating methods fieldwork, rapid desk - top analysis, combination hydrology, hydraulics, ecology
3. Habitat simulation relation flow: habitat
4. Holistic methodologies functional analysis, panels of experts