<b>Prediction of the longitudinal dispersion coefficient for small watercourses

Authors

  • Vanessa Vaz de Oliveira Universidade de São Paulo
  • Marcos Viní­cius Mateus Universidade Federal do Triângulo Mineiro
  • Julio Cesar de Souza Inácio Gonçalves Universidade Federal do Triângulo Mineiro
  • Alex Garcez Utsumi Universidade Federal do Triângulo Mineiro
  • Marcius Fantozzi Giorgetti Universidade de São Paulo

DOI:

https://doi.org/10.4025/actascitechnol.v39i3.29397

Keywords:

longitudinal dispersion coefficient, small watercourses, sodium chloride tracer.

Abstract

 Longitudinal dispersion coefficient (DL) is considered an essential physical parameter to water quality modeling in rivers. Therefore, the estimation of this parameter with high accuracy guarantees the reliability of the results of a water quality model. In this study, the observed values of longitudinal dispersion coefficient are determined for natural streams (with discharge less than 2.84 m3s-1), based on sets of measured data from stimulus-response tests using sodium chloride as a tracer. Additionally, a semi-empirical equation for prediction of DL is derived using dimensional analysis and multiple linear regression technique. The performance of the produced equation was compared to five empirical prediction equations of DL selected from literature. It presented correlation coefficient r2 = 0.87, suggesting that this equation is suitable for the estimation of DL in streams. It also presented better results for predicting the DL than the five equations from literature, showing an accuracy of 71%.

 

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Author Biographies

Vanessa Vaz de Oliveira, Universidade de São Paulo

Mestre em Ciências: Engenharia Hidráulica e Saneamento

Marcos Viní­cius Mateus, Universidade Federal do Triângulo Mineiro

Graduando em Engenharia Ambiental

Julio Cesar de Souza Inácio Gonçalves, Universidade Federal do Triângulo Mineiro

Doutor em Ciências: Engenharia Hidráulica e Saneamento; Professor da Universidade Federal do Triângulo Mineiro

Alex Garcez Utsumi, Universidade Federal do Triângulo Mineiro

Mestre em Ciências Cartográficas; Professor da Universidade Federal do Triângulo Mineiro

Marcius Fantozzi Giorgetti, Universidade de São Paulo

Doutor em Hidráulica e Saneamento

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Published

2017-07-06

How to Cite

Oliveira, V. V. de, Mateus, M. V., Gonçalves, J. C. de S. I., Utsumi, A. G., & Giorgetti, M. F. (2017). <b>Prediction of the longitudinal dispersion coefficient for small watercourses. Acta Scientiarum. Technology, 39(3), 291–299. https://doi.org/10.4025/actascitechnol.v39i3.29397

Issue

Vol. 39 No. 3 (2017)

Section

Civil Engineering

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