This paper presents an inverse modelling procedure to estimate the location and release rate of atmospheric pollution. The input to this model requires measured pollution concentration at a minimum of three observation sites on the ground and meteorological conditions such as wind speed and cloud cover. The inverse model is formulated as a least squares minimisation problem coupled with the sol...

Abstract The cross joint is one of the standard connection types for urban water supply pipelines. A pipeline containing joints was taken as research object using NaCl tracer. turbulent mixing characteristics and pollutants at pollutant migration diffusion were studied analysed by numerical analysis experimental measurement. primary purpose to check comprehensive influence six factors pipe diam...

The goal is to build up an inverse model capable of finding the release history of atmospheric pollution by using measured gas concentration data at just one location on the ground and identify the factors which affects the accuracy of the model predictions. The problem involves a non-steady point source of pollution at a known location in the atmosphere. This problem of finding the release rat...

Understanding the spatial and temporal variation of nutrient concentrations, loads, and their distribution from upstream tributaries is important for the management of large lakes and reservoirs. The Three Gorges Dam was built on the Yangtze River in China, the world's third longest river, and impounded the famous Three Gorges Reservoir (TGR). In this study, we analyzed total nitrogen (TN) conc...

Currently, the treatment of point source pollution has been basically com-pleted, and development non-point pollution(NPP) become a new threat to natural water. Unlike pollution, NPP is much more complex than in terms difficulty measures. Therefore, gradually focus researchers’ attention. This paper mainly reviews current research status on governance NPP, precisely urban agricultural governanc...

Urban waterways degradation due to runoff from residential areas can be reduced by adopting best management practices (BMPs) for irrigation, fertilizer, and pesticide use. Although stormwater urban has been studied extensively, we focus on single-family land use specifically. Outreach individual households may have a measurable impact since decisions are being made here. We surveyed evaluate th...