Quality Simulation Along Rivers

PC-QUASAR is a river network water quality and flow model for river networks. It is designed to be used by river regulatory authorities and water/sewerage utility companies to help manage river water quality. PC-QUASAR allows easy comparison between the existing state of the river and that which would exist after a planned change or an unplanned event had occurred in the river network. The model describes the changes in water quality over time and allows tracking of pollution pulses downstream. PC-QUASAR has been designed to be easy to use with no requirement to understand the computer operating system or the structure of data files. Output is in the form of color graphics on the screen or plotter, and in tabular form on printers. Parameters modeled are flow, nitrate, dissolved oxygen, ammonia, temperature, E. Coli, pH, Biochemical Oxygen Demand and a conservative pollutant or tracer.

Example of a reach profile plot
Example of a planning mode plot

PC-QUASAR models a river as a series of reaches, usually defined by the locations of tributary confluences, weirs, public water supply intakes or effluent discharges. During their passage through the reach, the concentrations of the water quality determinands are modified according to instream physical, biochemical and chemical processes. In the case of dissolved oxygen, for example, additions are made through re-aeration and photosynthetic oxygen production. Losses occur due to the decay of biochemical oxygen demand (BOD), the nitrification of ammonia and the respiration of algae and river mud. These water quality determinands may be edited by the user or imported from an ASCII file, for some or all segments of the river to be modeled. Modeling may then be undertaken using any combination of observed and edited parameters to predict the effects of real or potential changes to the river's use.

The QUASAR model is composed of a set of equations describing the changes in water quality and flow over time. In its dynamic mode, time series data are input to the model and flow and quality estimates are generated at each reach boundary over a period of time. Travel times are incorporated so that pollution pulses can be tracked downstream. In the planning mode, a Monte Carlo simulation approach is used to provide distributions of flow and quality at key sites of interest. Effluent consent levels can be designed to meet River Quality Objectives.


QUASAR models a river as a series of reaches usually defined by the locations of tributary confluences, weirs, public water supply intakes or effluent discharges. Each reach is subdivided into a number of subreaches, each modeled as a stirred tank reactor. At the input to a reach, a mass balance is performed on all the inputs or abstractions and the resulting river quality is routed down the reach. During their passage through the reach, the concentrations of the water quality parameters are modified according to instream physical and chemical processes.


In dynamic mode, the simulated water quality and flow can be viewed either as a profile along the river system or against time at any reach of interest (e.g., river abstraction site). In the planning mode, cumulative frequency and distribution curves are generated at any point. These can be exported to a spreadsheet or statistical package.


PC 486/Pentium with 8 MB RAM and Microsoft Windows. Supports all Windows printers. Call for DEC information.

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Incredible NetworksΤελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27, 2004
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