Technical Plan and Benefit Analysis for Urban Overpass Rainwater Resource Utilization
There are more than two-thirds of cities facing water scarcity and urban waterlogging issues in China.Uti-lization of urban rainwater resources can achieve unconventional water resource utilization and reduce the risk of ur-ban waterlogging.Because of the obvious height differences,urban overpasses have significant advantages in the collection of surface runoff.A technical plan for the utilization of rainwater resources in urban overpasses was pro-posed,which is making full use of the height difference of the bridge deck and 3D space of the bridge piers to achieve automatic runoff abandonment and purification before landing.The system includes four modules of rainwa-ter collection,data collection,central processing and rainwater reuse,collected rainwater is used for bridge deck spraying,green space irrigation,car washing,etc.Taking Beijing and Guangzhou as examples,the sizes of rainwa-ter collection tanks are designed for recurrence periods of 5,10,and 20 years,rainwater resource utilization benefit are analyzed under three different scenarios of abundant water period,normal water period,and drought period.The results show that the scheme with a 10-year recurrence period design is optimal for Beijing(The average return on investment(ROI)period is about 7 years),reducing 938 kg of CO2 emissions per set annually;For Guangzhou,the scheme with a 20-year recurrence period design is optimal(The average ROI period is about 3 years),reducing 1 398 kg of CO2 emissions per set annually.The design of rainwater resource utilization in urban overpasses embod-ies the development concept of constructing environmentally friendly,resource-saving,and sustainable cities,and is an important measure for reducing surface runoff,pollution control and resource utilization on urban overpass road surfaces.
国家科技期刊平台
NSTL
万方数据
