INTERNATIONAL CONFERENCE ON BIODIVERSITY

AND BUSINESS

- APPROACHES AND SOLUTIONS

October 02, 2014

Bolshaya Gruzinskaya street, Moscow, Russia

IDENTIFICATION OF BIODIVERSITY MITIGATION MEASURES

FOR HYDROPOWER-DEVELOPED RIVERS IN SWEDEN

Stéphanie Nicolin, ÅF Hydropower: Stephanie.nicolin@afconsult.com

OUTLINE

Background

Objective and methodology

Result

Turbine mortality

Evaluated flow scenarios

Other measures

Summary of environmental

mitigation measures

BACKGROUND

The Water Framework Directive

Common terms for water flows

General regulations in Sweden and

internationally

Power station Drop [m]Effect

[MW]

Prod/yr

[GWh]

Granö 18,5 8,8 31,5

Fridafors övre 7,3 1,2 7,5

Fridafors nedre 6 1,8 8,5

Ebbamåla 2 0,06 0,2

Hemsjö Övre 15 3,6 15,5

Hemsjö Nedre 11,5 1,8 10,4

Marieberg 5 0,9 3,2

OBJECTIVETo assess local conditions and effects of implementing environmental mitigation

measures for migratory fish in the River Mörrumsån, South of Sweden.

Example of mitigation measures:

Flow regulation

Measures for fish specifically

Other

METHODOLOGYA combination of tools

Passage mortality for

downstream

migrating smolts

Flow simulation for

dry river beds

Population model for salmon

R

E

S

U

L

T

METHODOLOGYOutput

Carrying capacity for an area in terms

of number of returning salmon

Fish mortality at

downstream

migration

Flow simulation for

dry river beds

Population model for

salmon

Percentage of lost smolts per power

plant

The size [ha] of potential

reproduction area for salmon

RESULTPassage mortality for downstream migrating smolts

Calculated smolts losses [%] for the power stations along the River Mörrumsån

10

21

9

5

25

18

25

0

5

10

15

20

25

30

Granö Fridafors

övre

Fridafors

nedre

Ebbemåla Hemsjö Övre Hemsjö

Nedre

Marieberg

Power stationAccumulated passage

mortality[%]

Granö 10

Fridafors övre 30

Fridafors nedre 36

Ebbemåla 39

Hemsjö övre 54

Hemsjö nedre 63

Marieberg 72

10

21

9

5

25

18

25

0

5

10

15

20

25

30

Granö Fridafors

övre

Fridafors

nedre

Ebbemåla Hemsjö

Övre

Hemsjö

Nedre

Marieberg

RESULTFlow simulations

A potential reproduction area

for salmon that varies in size

depending on the various

flow scenarios

RESULTFlow simulations

Small changes in selection criterion means large changes in result

0,1<depth<0,8

0,2<velocity<0,7

0,25<depth<0,5

0,1<velocity<0,8

RESULTComparing different levels of minimum flow discharges

0

10

20

30

40

50

60

70

80

90

0 2 4 6 8 10 12 14

Nu

mb

er

of

retu

rnin

g f

ish

es/

yr

Minimum flow, m3/s

Number of returning

fishes (average per year)

RESULTNumber of returning fishes as a function of different levels of

minimum flow

0

5

10

15

20

25

0

10

20

30

40

50

60

70

80

90

0 1 2 3 4 5 6 7 8 9 10 11 12 13

Pro

du

cti

on

lo

ssv [

GW

h/y

r]

Nu

mb

er

of

retu

rnin

gfi

shes/

yr

Minimum flow, m3/s

Returning fishes

Production loss

RESULTCost estimations for proposed mitigation measures

Measure Ecological effect Cost (kEUR/yr)

A min. flow at

Granö + fish

passages at

Fridafors power

stations

A low but viable population

could be sustained in the Granö

dry river bed

330-660

Removal of the

Marieberg

power station

A potential duplication of the

salmon population, upstream of

the power station

260

Prioritized mitigation measures:

1. To remove Marieberg power

station.

2. To implement a minimum flow at

Granö power station, given fish

passages will be installed at

Fridafors.

Conclusions

Thank you for listening!

Stéphanie Nicolin, ÅF Hydropower: Stephanie.nicolin@afconsult.com