Back Analysis Of Water Pollution Sources From Guangyuan To Nanchong In Jialing River

The current water pollution accident is still difficult to predict and control,Therefore,in order to ensure the water quality and drinking water safety in Jialing River,Established the migration and diffusion model of sudden water pollution accidents in the Guangyuan-Nanchong section of the Jialing River and the reversed analysis model of pollution sources of the sudden water pollution accident in the Jialing River.Integrate forward simulation of water pollution accidents and inversion of pollution sources to provide emergency decision-making and technical support for water quality protection and drinking water safety in Jialing River.The main research of this article is as follows:1)Data collection and organization.Collected hydrological and water quality data from Jialing River Guangyuan to Nanchong,Including flow and water level data and concentration of water quality parameters at each major site.The underwater topographic data of Jialing River from Guangyuan to Nanchong was collected.Collected data of 38 key sewage outlets along the coast from the Guangyuan to Nanchong section of the Jialing River.Preparing for the establishment of a follow-up model.2)One-dimensional hydrodynamic water quality model for the Jialing River has been established through MIKE11.The results show that this model can accurately reflect the water dynamics and water quality in the Jialing River Basin.The model can simulate the transmission and degradation of pollutants.Using the measured water level,flow,and water quality data to rate and verify the model.The bed roughness is 0.039,COD,ammonia nitrogen diffusion coefficient is 10m2/s,COD attenuation coefficient is 0.2/d,and ammonia nitrogen attenuation coefficient is 0.1/d.And set different conditions.Simulate the migration and diffusion of pollutants downstream when a sudden water pollution accident occurs.Therefore,this model can be used to study the accidental water pollution accident in the Guangyuan-Nanchong section of the Jialing River.3)Genetic algorithm-based back analysis model of pollution source was established.The position of the pollution source and the total amount of pollutants were inverted when there was a sudden water pollution accident from a single point source and a sudden water pollution accident from a double point source.reached a conclusion,Whether it is a single point source single variable or a single point source multivariate,When the population size is 10,satisfactory results can be obtained.For a dual-point source,because the inverse problem is ill-posed,Whether it is the single-variable inversion of two-point source or the multi-variable inversion of two-point source,there is a big error!...