Development of numerical model for the simulation of water-quality at rivers, using the software Vensim PLE® / Desenvolvimento de modelo numérico para a simulação da qualidade da água em rios utilizando o software Vensim PLE

AUTOR(ES)

Julio Cesar de Souza Inácio Gonçalves

DATA DE PUBLICAÇÃO

2009

RESUMO

The water-quality modeling is an indispensable tool for the water resource planning and management. However, the current available models for the simulation of water-quality, as the QUAL2K, present structural and functional limitations. With the purpose of offering a tool that facing those deficiencies, a model for time-variable simulation of the rivers water quality, using the software Vensim PLE® was developed. The model developed simulates eighteen water-quality variables (oxygen dissolved, carbonaceous BOD, organic nitrogen, ammonia, nitrite, nitrate, organic and inorganic phosphorus, inorganic solids, phytoplankton, zooplankton, bottom algae, coliforms, alkalinity, total inorganic carbon, pH and temperature),in addition to methane and the nitrogen and phosphorus forms existing in the aerobic and anaerobic layer of the sediment. Several scenarios were built to accomplish computational simulation using the model developed in this work, the program QUAL2E, the QUA2K, and when possible, analytical solutions. The results obtained, with this model, adjusted well to the results generated by the QUAL family models, at steady-state. The simulations at unsteady state presented good results since the numerical solutions followed the general tendency of the analytic solution.

ASSUNTO(S)

qualidade da água software vensim ple® water-quality modelagem software vensim ple® mathematical modeling

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