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Anne-Marie Hagman, Mika Marttunen

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... restoration projects to the Regional Environment Centers ... 1. Minimum criteria (example: activity, use of lake, state of lake, nature protection status) ... – PowerPoint PPT presentation

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Title: Anne-Marie Hagman, Mika Marttunen


1
Multicriteria decision analysis in lake
restoration projects
  • Anne-Marie Hagman, Mika Marttunen Ilkka
    Sammalkorpi

2
Backround
  • C. 1500 lakes need restoration. Hundreds of
    initiatives of restoration projects to the
    Regional Environment Centers
  • The estimated costs exceed the available
    government funding
  • Need for a systematic and transparent method to
    prioritize these initiatives and to identify the
    lakes in which restoration need and opportunities
    for the successful outcome are highest.
  • A multi-criteria decision analysis approach is
    currently being developed in the Finnish
    Environment Institute for the systematic
    comparison of the lakes in the municipality of
    Mäntsälä and in the Uusimaa region in southern
    Finland.

3
Multicriteria method for the priorization
  • 1. Minimum criteria (example activity, use of
    lake, state of lake, nature protection status)
  • 2. Quality of the background information of the
    lake/project (water quality, foodweb, loading,
    activity)
  • 3. Feasibility estimate division into 3
    categories urgent important useful) based
    on use and state of the lake and overall
    feasibility of the project
  • 4. Final ranking by the Web-Hipre model

4
Web-hipre-model
  • 1. Choosing the objectives and attributes for the
    comparison. Two main value trees have been
    developed for that
  • - State of the lake
  • - Recreational and nature values of the lake
  • 2. Assessing the performance of each lake in
    respect to each attribute
  • 3. Defining the relative importance of the
    attributes
  • 4. Calculating priorities for each lake by using
    Web-HIPRE model
  • 5. Analysing the results and drawing diagrams and
    other figures

5
Criteria of the model (state of lake)
  • Water quality Total phosphorus,Chlorophyll-
    a, occurence of oxygen depletion, elevated
    pH values, Secchi depth
  • Fish stock -chl-a/TP ratio (indirect indication
    of high planktivore density)-CPUE and cyprinid
    of Nordic multimesh gillnets
  • Algal blooms frequency and intensity of blooms
    reported from the beaches by health authorities
    or citizens

6
Criteria of the model (use of lake)
  • Current use beaches, cottages, tourism,
  • camp areas, nature trails
  • Potential use attainment (lakes distance to the
    nearest town in this case)

7
The Uusimaa-region
  • Totally 86 lakes compared
  • 58 lakes pass through to the second phase
  • 25 lakes have enough information -gt phase 3
  • 8 lakes conclude to urgent-group -gt
    Prioritization with the Web-HIPRE-model

8
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9
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10
Classification of the restoration need
  • Two priority values for each lake-Recreational
    and nature valuesuse-Ecological status of each
    lakestate
  • Are calculated with the Web-HIPRE-model
  • Plotting these priorities helps to analyse the
    differences in the status and the use of the lakes

11
The priority values for the ecological status of
Uusimaa lakes. The higher the priority value the
poorer is the condition.
12
The priority values for the recreational use of
Uusimaa lakes. The higher the value, the higher
is the use of lake.
13
The result of the analyses
High need for restoration
Advises to local volunteer lake managers
No need for restoration
Regular monitoring
14
Conclusions
  • All eight lakes which restoration needs were
    highest have already restoration projects in the
    Uusimaa region. And all projects have been
    funded.
  • Background information of lakes can be saved and
    easily updated and new priority values can be
    calculated.
  • The method is flexible and characteristics of
    different areas and different background
    information can be taken into account.
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