Impacts of imperious area change on runoff characteristics in Beijing
With the fast economic development, population increase, ongoing urbanization and expansion of the urban area, the paved area within the Beijing watershed increases 9 km2 yearly in average, and the underlying characteristics of the area are also highly affected. Moreover, the hot city island effect over Beijing may cause changes in the local climate so that short duration heavy rainfall occurs more frequently, runoff coefficients increase, and peak runoff discharge rises. Heavy rainfall generates flooding in the city and poses great pressure on the drainage system, which have caused a lot of problems in Beijing such as serious traffic jams and water logging caused by a rainstorm which occurred on 10th of July 2004. The impact on the runoff process by changes in the underlying surface has been clearly apparent. From the 1960s to the 1990s, the percentage of impervious area to the total Beijing urban area changed from 61％to 88％. The runoff coefficient also increased during this period. The similar level storm event such as 19590721 and 19940712 with volumes of 121.3mm and 121.5mm, respectively, produced runoff depths which were different with 50.3mm for 19590721 and 72.9mm for 19940712. Therefore, the drainage system in Beijing needs to be reviewed with high standard under consideration of climate change and increase of impervious area in Beijing.
impervious area precipitation runoff
TIAN Jinghong BAI Guoying LIANG lingjun WANG Wenjia
School of Civil& Environment Engineering, University of Science & Technology Beijing 100083 DHI Chin Beijing Hydrological Monitoring Station, Beijing, 100044 DHI China, Beijing, 100044
国际会议
The 6th International Symposium of Asia Institute of Urban Environment(亚洲城市环境学会第六届国际会议)
长春
英文
42-45
2009-09-20（万方平台首次上网日期，不代表论文的发表时间）