Thesis On River Water Pollution

One of the very important factors is the presence of the transient storage (dead zones), that deform...

more One year long study was executed from August 2016 to July 2017 to identify the present status of fish species diversity of Surma River at Sylhet Sadar, Northeast Bangladesh.

A total of 51 fish species belonging to 16 taxonomic families has been identified.

The time horizon for this study is from 2000 to 2030, yearly, and the spatial boundary is considered to be Hanumante River, Bhaktapur, Nepal.

The stakeholder, function, and scenario analyses are employed as three tools for study.

In 20 large, unregulated rivers the median NSE for water discharge was 0.84, and the corresponding number for 76 partly-regulated river basins was 0.52. These major achievements relative to previous similar experiments were ascribed to the step-wise calibration process using representative gauged basins and the use of a modelling concept, whereby coefficients are linked to physiographic variables rather than to specific sites.

This paper presents a new tool, developed with the aim of assessing the environmental impact from industrial effluents and sewage systems in Hanumante River and to recommend the finest procedures to control water pollution so as to...Different alternative themes have corresponding effects on the selected criteria.The choice is in the hands of the decision makers of Bhaktapur City.Statistical evaluation confirms that the proposed method approximates the measured concentrations significantly better than methods based upon the Gaussian distribution.The results achieved by this novel method are also comparable with the solution of the 1D advection-diffusion equation (ADE), whereas the proposed method is faster and easier to apply and thus suitable for iterative (inverse) tasks.Based on the interests of the stakeholders and their priorities, two alternatives resulting in four scenarios are identified and ranked against four selected criteria.A combination of improved industrial technology and efficient municipal waste management gives the best solution to the pollution problem in Hanumante River.The proposed approximate method is based on the asymmetric probability distribution (Gumbel’s distribution) and was verified on three streams in southern Slovakia.Tracer experiments on these streams confirmed the presence of dead zones to various extents, depending mainly on the vegetation extent in each stream.The catch per unit effort ranged from 0.15 to 0.48 with an average value of 0.34±0.11.Analytical solutions describing the 1D substance transport in streams have many limitations and factors, which determine their accuracy.