Water quality simulation and analysis in Gansu section of Bailong River Basin based on InfoWorks ICM model
Aiming at the problems of river water quality affected by the development of agricultural planting,livestock and poultry breeding and other industries along Bailong River,the Bailong River basin in southern Gansu Province was taken as the research object.The improved output coefficient model was used to calculate the pollution load of industrial,rural domestic waste,rural domestic sewage,livestock and poultry breeding,urban domestic sewage,urban runoff and farmland runoff in the basin under typical hydrological scenarios such as abundant,flat and dry years.Based on InfoWorks ICM,the dynamic water quality model of the Bailong River was constructed.The distribution characteristics of COD,TN,NH4+-N,TP and other pollution loads were simulated and analyzed,and the risk of water pollution in the Bailong River under the most unfavorable hydrological conditions was assessed,and the applicability of the model in the simulation and assessment of water pollution in the basin was verified.The results showed that the main sources of pollutant load into the river were different under different hydrological scenarios.For example,farmland runoff was the main source of COD pollution in wet and normal years,and the pollution load reached 1 382.56 t and 1 058.98 t respectively,while the pollution source in dry years was mainly urban runoff.There were obvious spatial differences in pollutant loads,and the spatial distribution of pollution loads in sub-basins in the study area was not uniform,and high pollution loads mainly appeared in the middle and lower sub-basins.The water quality of Bailong River was different in flood season and non-flood season,and the water quality in non-flood season was worse.Through the simulation of the most unfavorable hydrological scenario(non-flood season in dry year),it was found that the maximum concentration of NH4+-N in the Bailong River in the study area appeared in the middle reaches,reaching up to 1.43 mg/L,while the TP concentration was higher in the middle and lower reaches,reaching the highest value of 0.35 mg/L,which was difficult to meet the water quality requirements of Class Ⅲwater bodies,and there was a risk of water pollution.The improved output coefficient model had good reliability in the assessment of pollutant load,and the hydrodynamic water quality model based on InfoWorks ICM had strong applicability in the assessment of spatial and temporal distribution of pollutants,which provided demonstration reference and decision-making basis for river water quality simulation and watershed water environment management in China.
water quality simulationcoupling modelpollution loadspatial-temporal featurewater environment treatment
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