ANALYSIS ON RUNOFF COEFFICIENTS OF DIFFERENT IMPERVIOUS UNDERLYING SURFACES BASED ON A NOVEL RUNOFF COLLECTION METHOD FOR CITIES

WU Jun; WANG Yi-yao; MA Yan

doi:10.13205/j.hjgc.202102008

Volume 39 Issue 2

Jul. 2021

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WU Jun, WANG Yi-yao, MA Yan. ANALYSIS ON RUNOFF COEFFICIENTS OF DIFFERENT IMPERVIOUS UNDERLYING SURFACES BASED ON A NOVEL RUNOFF COLLECTION METHOD FOR CITIES[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 47-52. doi: 10.13205/j.hjgc.202102008

Citation:

WU Jun, WANG Yi-yao, MA Yan. ANALYSIS ON RUNOFF COEFFICIENTS OF DIFFERENT IMPERVIOUS UNDERLYING SURFACES BASED ON A NOVEL RUNOFF COLLECTION METHOD FOR CITIES[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 47-52. doi: 10.13205/j.hjgc.202102008

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ANALYSIS ON RUNOFF COEFFICIENTS OF DIFFERENT IMPERVIOUS UNDERLYING SURFACES BASED ON A NOVEL RUNOFF COLLECTION METHOD FOR CITIES

doi: 10.13205/j.hjgc.202102008

WU Jun^{1,2
,
,},
WANG Yi-yao³,
MA Yan¹

1. Shanghai Urban Water Resources Development & Utilization National Engineering Center Co. Ltd., Shanghai 200082, China;
2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
3. Chengdu Environmental Protection Research Institute, Chengdu 610072, China

Received Date: 2020-03-26
Available Online: 2021-07-19

Abstract

Abstract

By constructing the artificial rainfall system and the collection system of underlying surface runoff, the runoff coefficients of different impervious underlying surface in the city was analyzed. The analysis results of runoff coefficients of underlying surface showed that the average runoff coefficient of urban road was 0.82, which was lower than that of other the non permeable underlying surface (0.87~0.89). This was mainly due to the stronger permeability of urban road made of asphalt material and the strong absorption capacity of its coarse pores to water flow. Rainfall duration and intensity were the key factors affecting runoff coefficient of the underlying surface. The influence of rainfall duration on runoff coefficient of six non permeable underlying surfaces was significant, especially in the initial 20 minutes of rainfall, and the runoff coefficient rise rapidly, which was more than 4 times of the initial value at most; the increase of rainfall intensity was bound to shorten the runoff production time, intensify its impact on runoff coefficient, and make its correlation with runoff coefficient significantly higher than rainfall duration.
- urban,
- impervious underlying surface,
- runoff coefficient,
- runoff collection,
- artificial rainfall

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References(17)

References

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