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14.Water quality changes of the seawater. 2/4/11. 4. The aims of City of Kokkola ... Erosion: sandy beaches turn out to stony. Ice cover changes? No ice at ...

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

  2. Case Study areas • City of Kokkola • City of Raahe Bothnian Bay

  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

  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.

  5. Historical rewiew - future Shore line changes 1500-1800 • 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

  6. Kokkola sea level change High case +10 cm Ensemble average -41 cm Low case -87 cm DRAFT VERSION Draft version The lowest allowed height of building: Kokkola 2.20m, Raahe 1.50m

  7. The City of Kokkola • 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

  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

  9. Impacts on leisure time • Summer cottages by the sea shore • Boating – changing routes • Skiing, skating • Icehole fishing

  10. The lowest recommendable height for building • * Including the minimum wave action • Source: Kahma et al. 1998

  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

  12. 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?

  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 2007-2008 (10 meters deep)

  14. Thank you! Satu Putkinen Western Finland Office, GTK Tel.: + 358205505221 Mobile: + 358505361151 Email: satu.putkinen@gtk.fi

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