| With the rapid development of China’s economic construction,the problem of runoff pollution in many industrialized areas is becoming more and more serious,and the extremely high impermeability rate accompanying the large-area highly hardened road inside makes the rainwater unable to infiltrate in time,and always faces the risk of regional stagnation.At present,domestic and foreign scholars have relatively little research on the pollution characteristics of rainwater runoff in industrial areas.The problem of rainwater runoff pollution caused by the complex environment inside industrial areas has seriously hindered the improvement of surrounding water ecological environment and has a lagging impact on sustainable economic development.This paper takes Qingdao Licang Industrial Zone as the research area,selects regional typical rainfall to monitor and sample the rainwater runoff quality of industrial zone,analyzes and monitors the variation law of water sample pollutant concentration,summarizes the distribution characteristics of runoff pollutants and the regional initial runoff erosion effect.The characteristics of rainfall runoff,combined with SWMM,model the rainwater system in the industrial area,compare and analyze the effect of regional drainage load and runoff pollutant impact reduction before and after adding LID measures.Select monitoring points at appropriate locations in the upper and lower reaches of the industrial zone,and analyze the regional surface runoff water quality of 4 typical rainfalls.The monitoring indicators are SS,COD,TN,TP,heavy metals(Cu,Zn,Pb),focusing on different time intervals.The results show that the peak concentration of pollutants occurs in the early stage of rainfall,and the concentration of pollutants fluctuates serrated with the duration of rainfall,showing obvious initial scouring effect.Most of the peak concentration of pollutants in runoff exceeds the concentration limit of Class V water body in surface water environmental quality standards,and runoff pollution is serious.Statistical calculation of EMC values of runoff pollutants shows that there is no single synergy between EMC values and rainfall or rainfall intensity.Atthe same time,pollutant cumulative erosion curve M(V)and erosion intensity(PWI)are used to explore the output characteristics of runoff pollutants and their runoff scouring effects in industrial areas.Compared with pollutant concentration curve,M(V)curve and PWI value are more effective in identifying initial scouring.Based on SWMM,the rainwater system model of industrial area is built.The simulation results show that the waterlogging nodes and overloaded pipelines change with different recurrence periods P=1a,2a,3a,5a and 10 a.The results show that the maximum annual increase of waterlogging nodes is 34%,the maximum increase of overloaded pipelines is 23%,and the pollution load impact of discharge runoff becomes more serious with the increase of recurrence period.In order to alleviate the load pressure of runoff and water pollution in industrial areas,the effect of runoff control and water quality control under the LID measures was explored.The results showed that the overflow of LID nodes and the overloading of pipe and canal were greatly reduced through the infiltration,interception,stormwater and lagging emission characteristics of the LID measures.The discharge load of the outlet was also alleviated effectively,and the runoff coefficient and total runoff reduction rate were all 26% above all,the peak time was delayed for more than 10 minutes,and the total pollutant load of the discharge outlet was reduced by more than 59%.The effective deployment of LID measures reduced the risk of regional waterlogging and runoff pollution,and had significant water quality and quantity control effect. |
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