Estimation of longitudinal dispersion coefficient in rivers

Estimation of longitudinal dispersion coefficient in rivers

The longitudinal dispersion coefficient is a crucial parameter for 1D water quality analyzing in natural rivers, and different types of empirical equations have been presented in the literature. To evaluate the precision of those commonly used equations, 116 sets of measured data for rivers in U.S....

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Veröffentlicht in:Journal of hydro-environment research 2014-03, Vol.8 (1), p.2-8
Hauptverfasser: Zeng, Yuhong, Huai, Wenxin
Format: Artikel
Sprache:eng
Schlagworte:
Channels
Coefficients
Discrepancy ratio
Dispersions
Empirical equation
Empirical equations
Freshwater
Longitudinal dispersion
Mathematical analysis
Mathematical models
Regression analysis
Rivers
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Beschreibung
Zusammenfassung:The longitudinal dispersion coefficient is a crucial parameter for 1D water quality analyzing in natural rivers, and different types of empirical equations have been presented in the literature. To evaluate the precision of those commonly used equations, 116 sets of measured data for rivers in U.S. and UK have been collected for comparison. Firstly, the precisions of selected ten empirical equations under different aspect ratio (water surface width B/water depth H) have been compared, and calculation shows that most of the equations have underestimated the longitudinal dispersion when 20 
ISSN:1570-6443
1876-4444
DOI:10.1016/j.jher.2013.02.005