Ecological Stream restoration refers to the activities to restore the ecologically damaged rivers by removing the artificial disturbance from rivers in and around and to maintain the integrity of river ecosystem.
It restores the low water channel and other physical foundations to their close-to-nature state in order to ensure the self-purifying capacity of water, the ecological habitats for animal and plants, and the water-friendly features for the public.
From 1987 to 2013, the government has invested 1.6153 trillion Korean Won (KRW) in 1,510 projects and restored 1,034km of polluted or ecologically damaged rivers. The government will restore 1,667km of priority rivers from 2011 to 2017 according to a “Comprehensive Mid- to Long-term Plan on the Ecological Stream Restoration Project” formulated in 2010
The key aspects of ecological stream restoration consist of improving water quality, and restoring urban rivers, and aquatic life. Following projects are carried out to improve water quality: dredging contaminated sediments, constructing wetlands, and installing riverbed filtration facilities. To restore aquatic ecosystem, the project includes the creation of riffles and polls, the construction of biotopes, and the restoration of the meanders. The ecology observation post and the facility for experiential learning will be constructed, too. Urban rivers will be restored by removing cover structures and restoring disappeared waterways, building ecological water-front spaces, and providing dry and damaged rivers with the environmental flow. Aquatic life will be restored by selecting and restoring flagships species at each river.
Ecological stream restoration has not only resulted in the improvement of water quality and aquatic ecosystem, but also in a variety of public benefits such as provision of ecological spaces, job creation and other economic effects, and adaptation to climate change by decreasing city temperatures. A survey of 53 streams restored between 2007 and 2010 indicated that BOD was reduced by 64.8% (7.1mg/L→ 2.5mg/L) on average, and increased biodiversity was also confirmed. Cheonggyecheon in Seoul showed a temperature reduction of 0.3 to 3.3°C. It is possible to find the significant increases in the number of fish species after river restoration, suggesting the improved health of the aquatic ecosystem.
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Last modified : 2017-12-12 08:38
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