1. AstrA Case study areas: Cities Kokkola and Raahe 18-20. May 2006
Klaipeda
Satu Putkinen, GTK Finland

2. Case Study areas
Bothnian Bay
City of Kokkola
City of Raahe
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3. Case Kokkola Main interests are the impacts on: 1.Harbours
2.Industrial sewage water plant
4.municipal sewage water plant
5.Rummelö Natura 2000 area
6.Planned Sea Kokkola residential area
7.River Sunti planning
8.Bride Island residential area
9.Trullevi recreational buildings
10.Boat harbours
11.Recreation areas on shoreline
12.Dredgings of boating routes and shores
13.Wind energy building
14.Water quality changes of the seawater
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4. The aims of City of Kokkola
Description of the most probable/worst scenarios (sea level rise, storms, irregular weather events, droughts, precipitation, flow rates of the rivers).
To describe the development alternatives of the Old Harbour Bay and surroundings as well as the Ykspihlaja industry area in different scenarios till year 2100.
How these results can be taken into account in city planning – WP3 – documentation of the planning and related communication processes.
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5. Historical rewiew - future
Shore line changes
Collecting of the data of shore line changes and land use 500 years back (maps and physical changes on environment)
Estimating shore line changes till year 2100 in different scenarios
1800
1700
Kokkola, founded 1620
1600
1500
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6. Kokkola sea level change
DRAFT VERSION
High case
+10 cm
Ensemble average
-41 cm
Low case
-87 cm
Draft version
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The lowest allowed height of building: Kokkola 2.20m, Raahe 1.50m

7. The City of Kokkola Draft version Draft version
In 1980’ies storm surge cause flooding in River Sunti – water level reached Market place 2 kilometers from sea-shore.
Water level changes happen in few hours during the storms
Highest water level in November (1.2 meters above normal) – critical time for storms if no ice cover.
Usually ice cover between December and April
Draft version
Draft version
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8. Ykspihlaja area in Kokkola
Heavy industrial area
Sewage treatment plant near sea
Industrial waste water reservoir 3 m a.s.l.
Natura - protection area
Draft version
Draft version
Draft version
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9. Impacts on leisure time
Summer cottages by the sea shore
Boating – changing routes
Skiing, skating
Icehole fishing
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10. The lowest recommendable height for building
The lowest allowed height of building: Kokkola 2.20m, Raahe 1.50m
* Including the minimum wave action
Source: Kahma et al. 1998
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11. The City of Raahe
Old housing and summer cottage area on low-lying seashore
Boat routes are in danger
There is model of sea-level changes for harbour done before
Effects on coastal nature
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12. How will the the currents in Bothnian Bay change in future?
The City of Raahe
Ideal coast for wind mill park: low coast, small islands to shelter the mills > Problems in future? Storm winds? Advantages? Best locations?
How will the the currents in Bothnian Bay change in future?
Rivers bring sand and other debris with nutrients to shore >> problems with algae in closed bays
Moving underwater sandbanks cause problems in coastal area. Erosion: sandy beaches turn out to stony
Ice cover changes? No ice at the winters? More heap pack ice? Will the ice masses pack into the coasts more often? Can extend 600 m on-shore causing destruction! How to prepare for that?
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13. The City of Raahe Heavy industrial area is near the shore. (metal)
Port of Kokkola is one of the busiest (6)
Open year round
700 ships / year
Route to be dredged (10 meters deep)
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14. Thank you! Satu Putkinen Western Finland Office, GTK
Tel.:
Mobile:
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