As interest in heat waves and fine dust caused by rapid urbanization has increased, the Korea Forest Service is trying to improve urban environmental problems through the Wind Ventilation Forest Project, which is an urban forest development project. In particular, in the case of Wind-connecting fore...
As interest in heat waves and fine dust caused by rapid urbanization has increased, the Korea Forest Service is trying to improve urban environmental problems through the Wind Ventilation Forest Project, which is an urban forest development project. In particular, in the case of Wind-connecting forests on the side of the road, both heat generated by artificial mulching such as asphalt and fine dust generated by vehicle traffic and road should be able to respond. However, There is a lack of studies and guidelines related to Wind-connecting forests, making it difficult to create Wind-connecting forests. Therefore, in this study, air temperature and fine dust analysis were carried out according to the scenarios of various planting methods for the mitigation of the heat wave and fine dust along the road. Furthermore available strategies of creating Wind-connecting forests were proposed based on the scenario analysis. Scenario analysis was done for two study areas. Pyeongtaek and Daegu which have different characteristics. Envi-met, a model to simulate the microclimate in urban environment was used for analysing changes in air temperature and fine dust by different planting scenarios.
The results of the temperature simulation were similar in Pyeongtaek and Daegu. The more trees and the narrower the spacing between trees, the more effective the air temperature decreased. The effect of shade created by buildings and trees was the greatest, and in the case of trees, the air temperature reduction increased as the width of the crown was wider. Placing various tree species together was effective in reducing temperature. The results of the fine dust simulation showed different results in Pyeongtaek and Daegu. In Pyeongtaek, where the height of the building is relatively low and the wide space of the sidewalk is secured, the higher the wind speed, the lower the concentration of fine dust. Although the fine dust adsorption of plants is the highest, the concentration of fine dust was the highest in Case 3, which has the lowest wind speed. This means that the faster the wind speed, the faster the fine dust diffuses, so a high concentration of fine dust could not be accumulated. For large spaces such as Pyeongtaek, it is effectively judged to create Wind-connecting forests in consideration of air circulation. However, in Daegu, where there are many tall buildings and relatively narrow sidewalk spaces, trees caused a decrease in wind speed and there was turbulence caused by buildings and trees. In addition, the generation of fine dust was more than that of Pyeongtaek, and the fine dust could not spread rapidly into a narrow space. Contrary to Pyeongtaek, the wind speed in Case 3 was the lowest, but the high shrubs blocked fine dust and the fine dust concentration was the lowest. It is believed that blocking fine dust is more effective in narrow spaces such as Daegu. To create a roadside Wind Ventilation Forest, it must be created in consideration of the space around the target site. Considering both heatwave and fine dust, trees should be increased in narrow spaces to reduce temperature and block fine dust. In a large space, a connected forest should be created in consideration of air circulation by utilizing trees with the wide crown. This study analyzed the effects on heat waves and fine dust according to the roadside Wind-connecting forest construction. It is meaningful that the construction of a Wind-connecting forest was proposed considering both heat waves and fine dust. In addition, this study could be used as basic data for guideline development of planning Wind-connecting forests.
As interest in heat waves and fine dust caused by rapid urbanization has increased, the Korea Forest Service is trying to improve urban environmental problems through the Wind Ventilation Forest Project, which is an urban forest development project. In particular, in the case of Wind-connecting forests on the side of the road, both heat generated by artificial mulching such as asphalt and fine dust generated by vehicle traffic and road should be able to respond. However, There is a lack of studies and guidelines related to Wind-connecting forests, making it difficult to create Wind-connecting forests. Therefore, in this study, air temperature and fine dust analysis were carried out according to the scenarios of various planting methods for the mitigation of the heat wave and fine dust along the road. Furthermore available strategies of creating Wind-connecting forests were proposed based on the scenario analysis. Scenario analysis was done for two study areas. Pyeongtaek and Daegu which have different characteristics. Envi-met, a model to simulate the microclimate in urban environment was used for analysing changes in air temperature and fine dust by different planting scenarios.
The results of the temperature simulation were similar in Pyeongtaek and Daegu. The more trees and the narrower the spacing between trees, the more effective the air temperature decreased. The effect of shade created by buildings and trees was the greatest, and in the case of trees, the air temperature reduction increased as the width of the crown was wider. Placing various tree species together was effective in reducing temperature. The results of the fine dust simulation showed different results in Pyeongtaek and Daegu. In Pyeongtaek, where the height of the building is relatively low and the wide space of the sidewalk is secured, the higher the wind speed, the lower the concentration of fine dust. Although the fine dust adsorption of plants is the highest, the concentration of fine dust was the highest in Case 3, which has the lowest wind speed. This means that the faster the wind speed, the faster the fine dust diffuses, so a high concentration of fine dust could not be accumulated. For large spaces such as Pyeongtaek, it is effectively judged to create Wind-connecting forests in consideration of air circulation. However, in Daegu, where there are many tall buildings and relatively narrow sidewalk spaces, trees caused a decrease in wind speed and there was turbulence caused by buildings and trees. In addition, the generation of fine dust was more than that of Pyeongtaek, and the fine dust could not spread rapidly into a narrow space. Contrary to Pyeongtaek, the wind speed in Case 3 was the lowest, but the high shrubs blocked fine dust and the fine dust concentration was the lowest. It is believed that blocking fine dust is more effective in narrow spaces such as Daegu. To create a roadside Wind Ventilation Forest, it must be created in consideration of the space around the target site. Considering both heatwave and fine dust, trees should be increased in narrow spaces to reduce temperature and block fine dust. In a large space, a connected forest should be created in consideration of air circulation by utilizing trees with the wide crown. This study analyzed the effects on heat waves and fine dust according to the roadside Wind-connecting forest construction. It is meaningful that the construction of a Wind-connecting forest was proposed considering both heat waves and fine dust. In addition, this study could be used as basic data for guideline development of planning Wind-connecting forests.
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