YANG Zongzheng1, GONG Hongjun1, CAO Jingguo1, CHANG Suyun2
（1. Tianjin University of Science and Technology, Tianjin 300222, China;
2. Tianjin Hydraulic Research Institute, Tianjin 300222, China）
Abstract: There are different regional characteristics of rain runoffs due to different production structure and lifestyle in areas of different living standards. Aiming at pollution characteristics of rain runoffs in Tianjin, rainfalls collected from downtown Tianjin were taken as the research object to investigate pollution characteristics of rain runoffs in five regions of different living levels in downtown Tianjin. According to analyses on 5 rainfall processes at 9 monitoring points in test areas, it was found that the event mean concentration (EMC) of solid suspended matter (SS), chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen (NH3-N) and total phosphorus (TP) in the path flow of downtown Tianjin were 159.5~386.1 mg/L, 74.6~157.6 mg/L, 6.5~10.2 mg/L, 1.9~5.4 mg/L and 0.38~1.07 mg/L, respectively, and EMC values of SS, COD, TN, NH3-N and TP in roof runoffs were 107.7~135.1 mg/L, 70.5~102.3 mg/L, 8.3~9.1 mg/L, 3.1~4.1 mg/L and 0.24~0.69 mg/L, respectively. For the path flow, the slopes of fitted lines of SS, COD and TP concentrations with the living standard were -104.7, -44.8 and -0.28, respectively, indicating that SS and COD were affected significantly by regional living levels in negative correlations. A strong correlation was found between SS and COD in runoffs with a correlation coefficient of 0.86, the lower was the living level, the greater was the impact of rainfall to the runoff pollution in the region. For the roof runoff, pollution concentrations were less correlated with regional living levels, the impact of rainfall on roof runoffs was small, while the main influencing factor was the strength of the initial effect. When the regional pollution source is the life source and the living level of the region is high, the Sartor-Boyd scouring model can be used in the simulation.
Key words: roof; road; correlation; standard of living; Sartor-Boyd wash-off model
EARTH AND ENVIRONMENT Vol.48, No.5, Tot No.337, 2020, Page 593-601
