HAIYong-long,YUDa-wei,WEIYuan-song,et al.Effect of Rainfall Evolution Characteristics on Combined Sewer Overflows in the Upstream of North Canal[J].China Water & Wastewater,2024,40(7):123-129.
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Effect of Rainfall Evolution Characteristics on Combined Sewer Overflows in the Upstream of North Canal

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第7期 Page: 123-129 Column: Date of publication: 2024-04-01
Author(s):
HAI　Yong-long1; 2; 3;  YU　Da-wei1; 2;  WEI　Yuan-song1; 2; 3;  XU　Chang-gui4;  WU　Jin-feng5;  LIU　Meng-meng1; 2; 3;  ZHENG　Jia-xi1; 2; 3
（1. State Key Joint Laboratory of Environment Simulation and Pollution Control， Research Center for Eco-Environmental Sciences， Chinese Academy of Sciences， Beijing 100085， China； 2. Laboratory of Water Pollution Control Technology， Research Center for Eco-Environmental Sciences， Chinese Academy of Sciences， Beijing 100085， China； 3. University of Chinese Academy of Sciences， Beijing 100049， China； 4. Management Office of Shahe Dam of Changping District， Beijing 102206， China； 5. Management Office of Nansha River of Changping District， Beijing 102206， China）
Keywords:
North Canal;  rainfall characteristics;  temporal distribution;  combined sewer overflows
Abstract:
This paper analyzed the evolution characteristics of rainfall in the upstream of North Canal in Beijing from 1975 to 2018, and investigated the effect of two typical rainfall on the combined sewer overflows in August 2018, so as to clarify the influence of rainfall characteristics on combined sewer overflows under the background of climate change. 80% of the rainfall in the upstream of North Canal was in the flood season from June to September. The rainfall events mainly distributed around 21:00, and most of the rainfall intervals were less than 10 days to 15 days. In recent years, the annual rainfall showed a downward trend, and the average rainfall intensity decreased, indicating that the combined sewer overflows mainly occurred in summer nights. The peak intensity of extreme rainfall from July 16 to August 15 in the main flood season increased, and the double peak heavy rainfall with annual occurrence of 1.7 times scoured the sediments in the pipeline, making the combined sewer overflows became the prominent instantaneous pollution source in the upstream of the North Canal. The redundancy analysis results showed that the overflows were mainly affected by the cumulative rainfall and rainfall duration. To sum up, the rainfall characteristics were particularly important for the control of combined sewer overflows in the upstream of North Canal, and the control of sediment in the pipeline and total overflows in the main flood season should be paid more attention to. Therefore, weather forecasting has a particularly important guiding significance for the control of combined sewer overflows.
Last Update: 2024-04-01