Authors:
Liu Yang
1
;
2
;
Bing Wang
1
;
2
;
Bo Ma
3
;
Shuhong Xue
3
;
Xiao Yang
3
and
Shili Wei
3
Affiliations:
1
Research Center of Eco-hydraulics and Sustainable Development, The New Style Think Tank of Shaanxi Universities, Xi'an, China, China
;
2
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China, China
;
3
Power China Northwest Engineering Corporation Limited, Xi'an, China
Keyword(s):
Sponge transformation quarter, Rainfall-runoff, Control effect, Northwest China
Abstract:
To cope with urban flooding, water pollution, and water shortage, China has proposed and continuously promoted sponge city construction. The quarter-scale site is the main carrier for the centralized deployment of small scattered sponge facilities, which is an important part of the urban stormwater system and an essential link to realize the source reduction of rainfall-runoff. The diversification of sponge facility types and structures and its combined applications have greatly changed the ecological background and hydrological characteristics of a quarter, and the nonlinear relationship of rainfall-runoff has become more complex. It is of great practical and guiding significance to study the role and effect of small community sponge transformation on the control of rainfall-runoff. Therefore, this study takes a sponge transformation quarter in northwest China as an example, based on the storm water management model, constructs a quarter rainfall model before and after spongy transf
ormation, and carries out the process and effect analysis of rainfall-runoff control. The main research results show that: 1) During the monitoring period, after sponge transformation in the study area, the runoff control rate in response to 1.0 mm-45.5 mm rainfall event reached 83.49%-99.07%, with a better reduction effect on the peak flow and its occurrence time. 2) For the heavy rain event on August 3, 2019, the peak reduction rate was 69.7%, and the runoff control rate increased from 50.09% to 85.25% before the sponge transformation, and for the heavy rain event on June 27, 2019, the peak reduction rate was 58.79%, and the runoff control rate improved from 48.89% to 83.49% before the sponge transformation. 3) After the sponge transformation of the study area, the storage facilities played a better role in the storage, and the water depth of the standing water node was lower than before. For the storm event on June 27, 2019, the water depth in the rainwater discharge wells on the east side of the study area decreased by 0.05 m compared with that before the transformation, and the rainwater runoff control effect was apparent.
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