Analytical solution for the stationary model of pollutant propagation in an aquatic medium

This work presents a new analytical approach for solving pollutant dispersion problems along irregular-shaped water bodies. In this approach, the advection-diffusion equation is expressed in terms of orthogonal curvilinear coordinates, defined by the velocity potential and the corresponding stream function for inviscid flows. The boundary condition rewritten in terms of these new coordinates is reduced to a classical third kind one, i.e., the derivative of the concentration distribution with respect to the stream function is proportional to the numerical value of the local pollutant concentration. The solution obtained from the proposed formulation was employed to simulate pollutant dispersion (thermotolerant coliforms) along the Pampa Creek, a tributary of the Sinos River at the outskirts of Novo Hamburgo city, South Region of Brazil. The results obtained reproduce the qualitative behavior of the expected concentration distribution.

GIS-based Surface Water Monitoring System and Modelling for Conservative and Reactive Pollutants, Applied on the Upper Basin of Olt River

This paper presents the problem of pollutant propagation monitoring and modeling on the upper zone of a river. The first model of the pollutant propagation is based on the averaging mass balance, without computing chemical and biochemical transformations. The second model was developed using the Streeter Phelps oxygen balance, including the kinetic terms of re-aeration and oxygen consuming. Experimental data set was obtained on the upper zone of the Olt River; using this data set, the proposed model was calibrated. The development of the model is like a part of a GIS-based environmental information system. Calculated results are depicted by diagrams and thematic maps of the upper Basin of Olt River, representing the water-quality parameters.

Hydrological information system based on on-line monitoring - from strategy to implementation in the Brantas River Basin, East Java, Indonesia

The worsening environmental situation of the Brantas River, East Java, is addressed by a comprehensive basin management strategy which relies on accurate water quantity and quality data retrieved from a newly installed online monitoring network. Integrated into a Hydrological Information System, the continuously measured indicative parameters allow early warning, control and polluter identification. Additionally, long-term analyses have been initiated for improving modelling applications like flood forecasting, water resource management and pollutant propagation. Preliminary results illustrate the efficiency of the installed system.