The first flush effect of different urban underlying surfaces through artificial simulated rainfall

International Symposium on Resource Exploration and Environmental Science

地球科学;生态环境科学

Wang, Zhao^1,2,3,4 ; Lei, Guangyu^1,2,3,4 ; Niu, Yan^1,2,3,4

Shaanxi Provincial Land Engineering Construction Group Co., Ltd, Xi'an

710075, China^1

Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd, Xi'an

710075, China^2

Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Land and Resources, Xi'an

710075, China^3

Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi'an

710075, China^4

关键词: Artificial simulated rainfall;    Asphalt roads;    First flush;    First flush effect;    Mean values;    Rainfall intensity;    Underlying surface;    Urban underlying surfaces;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/64/1/012077/pdf
DOI  :  10.1088/1755-1315/64/1/012077

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Three kinds of underlying surfaces: asphalt road, impervious tiles and grassland at Chang'an University in south second ring road of Xi'an were chosen as testing sites. Self-made device was used to moderate rainfall with different raining conditions: uniform rainfall intensity of 0.3mm/min, 0.5mm/min, 1.0mm/min; front peak type rainfall and back peak type rainfall. The pollutants in the runoff were measured, that included TN, TP, NO3--N, NO2--N, NH4+-N, PO43--P and PN M(V) curves and MFF30values were analysed to drew these conclusions: under uniform rainfall intensity of 0.3mm/min, 0.5mm/min, 1.0mm/min, the mean values of MFF30from asphalt road runoff were 0.47, 0.42, 0.41, the mean values of MFF30from watertight tiles runoff were 0.40, 0.39, 0.38, the mean values of MFF30from grassland runoff were 0.33, 0.34, 0.32. The first flush magnitude decreased with the increasing of rainfall intensity on asphalt road and watertight tiles, while the first flush intensity first increased and then decreased with the increasing of rainfall intensity on grassland. The mean values of MFF30from the front peak type rainfall were larger than that from the back peak type rainfall on both asphalt road and watertight tile. The mean values of MFF30from the back peak type rainfall were larger than that from the front peak type rainfall on grass. Grassland should be built around asphalt road and watertight tiles to attenuate first flush effect.