| In order to solve the uneven distribution of water resources in China,the current situation of insufficient per capita possession,so that water resources are reasonably distributed,China has built a large number of water diversion projects,and due to the long lines of water diversion projects,many horizontal and vertical buildings,part of the water open,water transmission line industrial enterprises dense,resulting in rivers and canals and other water transmission facilities prone to sudden water pollution events,and water pollution events often cause serious social impact and The water pollution incidents often result in serious social impacts and economic losses.Therefore,in order to establish a set of rapid traceability methods that can be applied to the actual emergency response of water pollution incidents,a one-dimensional river and canal water pollution incident as the research object,the hydrodynamic model and pollutant migration transformation model of the river and canal were studied and the traceability model was constructed,aiming to provide some technical reference and data support for the development of emergency response after the sudden water pollution.The main research content and results of the thesis are as follows:In this paper,we summarize the characteristics of sudden water pollution events in rivers and canals,construct a mathematical model of pollution source information based on the migration and transformation mechanism of pollutants in one-dimensional rivers and canals,water quality coupling model and coupling probability density function,and use BAS(Beetle Antennae Search)intelligent optimization algorithm to realize traceability calculation of sudden water pollution events in a section of the channel leading to Qin,and carry out Laboratory tests were conducted to validate the traceability model,and finally an integrated monitoring and traceability emergency response method was proposed for the emergency response phase of water pollution emergencies.The main research results are as follows:(1)Overview of the problem of traceability of sudden water pollution and assumptions of research conditions.The characteristics of sudden water pollution events are summarised,and the migration and transformation modes,dispersion stages and water pollution traceability problems of pollutants in sudden water pollution events in rivers and canals are categorised and summarised.By making assumptions on water pollution traceability problems and pollutant transport models,the research object is determined to be a one-dimensional river and canal,and the pollutant discharge conditions are transient fixed point source discharge.(2)One-dimensional river and canal water quality coupling model construction.By simplifying the research model,the water flow dynamics and pollutant migration transformation were analysed from two aspects of the water flow in the micro-metal water body due to precipitation,evaporation,seepage,pollutant discharge and other factors,combined with the initial boundary conditions to construct a one-dimensional river canal water flow and water quality coupling model.(3)A one-dimensional river and canal outbreak water pollution traceability model was constructed based on the BAS(Beetle Antennae Search)algorithm.The coupled probability density function is established by combining the relationship between the Forward concentration probability density(FC-PDF)and the Backward location probability density(BL-PDF).The coupled probability density function is proposed to be combined with the BAS algorithm to build a traceability model for sudden water pollution in rivers and canals,considering the influence of the BAS algorithm’s own step update mechanism on the traceability results and introducing a chaotic disturbance mechanism to optimize the algorithm.The results show that the BAS algorithm is suitable for solving the traceability problem of sudden water pollution,and the traceability results tend to be closer to the real values.(4)Experimental validation of the river and canal traceability model for sudden water pollution and improvement of emergency response methods for sudden water pollution events.In order to further verify the applicability and calculation accuracy of the constructed water pollution traceability model in actual water pollution events,the one-dimensional river canal instantaneous point source pollutant discharge conditions were simulated in the laboratory under real environmental conditions,and the water pollution traceability model constructed based on the traditional BAS algorithm and the improved BAS algorithm was used for experimental data calculation.The results show that the improved BAS algorithm has significantly improved the accuracy of the traceability model calculation,and the water pollution traceability model constructed based on the BAS algorithm is also suitable for solving the traceability problem of sudden water pollution. |
