Research And Development Of Point Source Pollutant Identification Method And Mobile Online Monitoring Platform For Inland River

With the vigorous development of China’s industrialization,promoting the improvement of the national economy,at the same time,the hidden trouble behind the development can not be ignored.In recent years,water pollution incidents have occurred from time to time all over the country,mainly due to factory leakage,chemical pollution of pesticides,human water pollution and so on.As one of the countries with the poorest fresh water resources per capita,the issue of water security has become urgent.After the occurrence of water pollution events,it is of great significance to quickly and accurately identify and obtain the pollution source information of the target waters,find the emission location,time and concentration of the pollution source,and provide reference and basis for relevant departments to formulate relevant strategies in time after the occurrence of pollution.Aiming at the problem that there is no fixed safe shelter in the chemical park after the transient gas leakage accident,a decision method for the escape route of the nonfixed target of poison gas leakage is proposed.In the calculation of the gas spatial concentration field,the method of determining the horizontal diffusion coefficient and the vertical diffusion coefficient of the gas determined by the PG diffusion curve is corrected by the ground roughness,so that the improved Gaussian diffusion model is suitable for the gas concentration of complex terrain in the chemical park.Calculation.Then according to the gas space concentration field,a discretization method for toxic gas damage to human body is proposed and combined with gas concentration to determine the safe shelter and the optimal escape route.The problem of the gas leak escape route planning without fixed safety refuge is solved,and the gas concentration calculation accuracy rate is effectively improved,and the algorithm time complexity of the personnel path planning is reduced,and the deviations of the identification indicators(emission concentration,emission coordinates,and emission time)in the results are all within 6%.In order to meet the flexibility and real-time of pollutant source tracing in target waters,this paper developed a mobile online monitoring platform based on cloud platform,including ground control center,cloud server and unmanned ship.The user can open the ground control center and establish a connection with the unmanned ship.It can support the remote control of the unmanned ship through the map setting route.The unmanned ship and the ground control center use the MAVLINK protocol as the communication protocol,and the unmanned ship uses the GPS to obtain the operation.The self-latitude and longitude,using the water quality sensor to monitor the water quality data is uploaded to the cloud server,and the cloud server forwards the data to the control center for processing and display.The ground control center adopts the B/S architecture design,and combines Baidu map to dynamically display the unmanned ship trajectory,which can perform fixed-point cruise and remote identification operations.At the end of the paper,the identification algorithm proposed in this paper is combined with the mobile online monitoring platform to verify the actual water environment.Several auxiliary monitoring points are set on the shore.The experiment uses Na Cl as the pollutant reagent,and the monitoring point sends the monitored conductivity value to the ground periodically.In the control center,the control center converts the conductivity into the corresponding Na Cl concentration,and carries it into the algorithm for iterative calculation.The next coordinate point is sent to the unmanned ship,and the unmanned ship sails to the target position,and finally the pollutant discharge point is iterated.Emission concentration,The deviations of the identification indicators(emission concentration,emission coordinates,and emission time)in the results are all within 30%.Finally,the experimental results are analyzed and subsequent experimental recommendations are given.Finally,the experimental results are analyzed and Suggestions for the follow-up experiments are given.The research content of this paper provides help for relevant departments to grasp water quality information and formulate relevant strategies after the occurrence of pollution.