Strategies for utilizing Urban Ventilation Corridor considering Local Cold Air in Watershed Areas - A Case Study of Uijeongbu and Gwacheon -

유역의 찬공기 특성을 고려한 도시 바람길 활용 전략 - 경기도 의정부 및 과천 일대를 사례로 -

Abstract

This study aims to analyze cold air characteristics in the watershed areas and to suggest strategies for utilizing them in urban ventilation corridor plans. For this purpose, the Jungnangcheon watershed and Uijeongbu-si in the northern part of Gyeonggi province, and Anyangcheon watershed as well as Yangjaecheon Tancheon watershed and Gwacheon-si in the southern part were selected as study areas. We used KALM (Kaltluftabflussmodell), a cold air simulation model developed in Germany and identified both the cold air flow and the height of cold air layer generated during 6 hours at night. Uijeongbu City is located on the main stream of the Jungnangcheon watershed, and the local cold air from the southern outskirts is an important part of Uijeongbu-si's overall ventilation corridor planning. In addition, the cold air generated in the vicinity of Mt. Sapae flows into the central business district near the city hall and plays a major role in regulating the thermal environment of the city. But, the cold air flows in the eastern part of Uijeongbu-si was not smoothly. The cold air flow generated in the east of Gwanak Mountain and in the west of Cheonggye Mountain was the most active in the northern part of Gwacheon-si. This flow is also a major ventilation corridor in Anyangcheon watershed as well as Yangjaecheon Tancheon watershed. But, the southern part where the cold air flow is not smooth is planed to be developed as 'Gwacheon Knowledge Information Town Public Housing District', so rapid development is expected in the future. Hence, it is suggested that an additional ventilation corridor plan should be established based on the detailed local wind flow analysis.

본 연구는 찬공기 특성을 유역단위로 분석하고, 유역 내 생성되는 찬공기를 도시 바람길 계획에서 활용하는 방안을 제안하는 것을 목적으로 한다. 이를 위해, 경기도 지역의 북쪽에 위치한 중랑천 유역의 의정부시, 남쪽에 위치한 안양천 유역 및 양재천 탄천 유역의 과천시를 연구 대상지로 선정하였다. 찬공기 특성 분석을 위해 독일에서 개발된 모형인 KALM(Kaltluftabflussmodell)을 활용하였으며, 야간 6시간 동안 생성되는 찬공기 흐름 및 찬공기층 높이를 파악하였다. 중랑천 유역의 주요 바람길이 흐르는 곳에 위치해 있는 의정부시는 남쪽 외곽에서부터 유입된 찬공기가 의정부시 전체 바람길 계획의 중요한 부분을 차지하고 있다. 또한, 서쪽의 사패산 일대에서 생성된 찬공기는 시청 인근의 중심상업지구까지 유입되고 있어 도심의 열환경을 조절하는 주요한 역할을 수행하는 것으로 판단된다. 반면, 의정부시 동쪽지역은 바람길 이용이 원활하지 않는 것으로 파악되었다. 동쪽의 관악산과 서쪽의 청계산 등에서 생성된 찬공기 흐름은 과천시의 북쪽 지역에서 가장 활발하였는데, 이 흐름은 안양천 및 양재천 탄천 유역 전체에서도 주요한 바람길이다. 이에 비해, 찬공기 흐름이 원활하지 않은 남쪽지역에 '과천지식정보타운 공공주택지구' 조성이 계획되어 있어 향후 이 지역의 주거환경이 저하될 가능성이 크다. 향후, 이 지역을 개발할 경우 상세한 바람길 분석을 통한 바람길 활용 계획을 추가적으로 수립할 것을 제안하였다.

FIGURE 1. Study area (1): Jungnangcheon watershed and Uijeongbu-si

FIGURE 2. Study area (2): Anyangcheon/Yangjaecheon·Tancheon watersheds and Gwacheon-si

FIGURE 3. Hourly variation in the velocity of local cold air in the vicinity of Jungnangcheon watershed during six hours after sunset from KALM model simulations

FIGURE 5. Hourly variation of the altitude of local cold air layer in the vicinity of Jungnangcheon watershed during six hours after sunset from KALM model simulations

FIGURE 4. The outline of local cold airflows after six hours of cold air generation

FIGURE 6. Hourly variation in the velocity of local cold air in the vicinity of Uijeongbu-si during six hours after sunset from KALM model simulations

FIGURE 7. The outline of local cold airflows after six hours of cold air generation

FIGURE 8. The local cold airflows within Uijeongbu-si in detail

FIGURE 9. Hourly variation of the altitude of local cold air layer in the vicinity of Uijeongbu-si during six hours after sunset from KALM model simulations

FIGURE 10. Hourly variation in the velocity of local cold air in the vicinity of Anyangcheon and Yangjaecheon·Tancheon watersheds during six hours after sunset from KALM model simulations

FIGURE 11. The outline of local cold airflows after six hours of cold air generation

FIGURE 12. Hourly variation of the altitude of local cold air layer in the vicinity of Anyangcheon and Yangjaecheon·Tancheon watersheds during six hours after sunset from KALM model simulations

FIGURE 13. Hourly variation in the velocity of local cold air in the vicinity of Gwacheon-si during six hours after sunset from KALM model simulations

FIGURE 14. The outline of local cold airflows after six hours of cold air generation

FIGURE 15. The local cold airflows within Gwacheon-si in detail

FIGURE 16. Hourly variation of the altitude of local cold air layer in the vicinity of Gwacheon-si during six hours after sunset from KALM model simulations

FIGURE 17. The local cold air flows, land cover classifications, an aerial image and development plans of Uijeongbu-si

FIGURE 18. The local cold air flows, land cover classifications, an aerial image and development plans of Gwacheon-si

TABLE 1. Average and maximum wind speed by administrative areas (m/s)