NDLI: Determinação do coeficiente de dispersão longitudinal em rios

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Determinação do coeficiente de dispersão longitudinal em rios

Content Provider	Semantic Scholar
Author	Soares, Pétrick Anderson Pinheiro, Adilson Zucco, Evelyn
Copyright Year	2013
Abstract	RESUmO: O coeficiente de dispersão longitudinal é um elemento importante em modelagem de qualidade de águas em cursos de água naturais. A sua estimativa tem sido real‐ izada por métodos indiretos. Este trabalho tem por objetivo determinar coeficientes de dispersão longitudinal em rios, com diferentes características hidráulicas. Foram realizados ensaios com o traçador conservativo rodamina‐WT em seis rios diferentes. O coeficiente de dispersão longitudinal foi calculado a partir de dois métodos diretos: i) propagação ou routing e ii) método da coroa de concentração ‐ MCC. Os resultados demonstram que o valor de coeficiente pode ser influenciado diretamente pelo método utilizado. Para os cursos de água com vazão até 0,227 m3s‐1, os coeficientes de dispersão longitudinal variaram de 0,10 a 1,21 m2s‐1, enquanto que os cursos de águas maiores apresentaram coeficientes superiores a 4,64 m2s‐1, chegando a 17,04 m2s‐1. Resultados obtidos através de cinco equações empíricas foram comparados com os dados obtidos em campo. A equação proposta por Devens et al. (2010) apresentou maior aderência ao valores medidos nos ensaios de campo. Um modelo matemático, estabelecido por análise de regressão múltipla das características hidráulicas, foi desenvolvido, com coeficiente de determinação de Pearson igual a 0,973. PAlAVRAS‐ChAVE: Coeficiente de dispersão longitudi‐ nal, traçadores, poluição hídrica. AbSTRACT: The longitudinal dispersion coefficient is an important element in quality water modelling in natural river. His estimate has been made by indirect methods. This study aims to determine the longitudinal dispersion coefficient in rivers with different hydraulic characteristics. Assays were performed with the tracer ‐ conservative rhodamine WT in six different streams. The longitudinal dispersion coefficient was calculated from two direct methods i) routing and ii) method of crown concentration ‐ MCC . The results demonstrate that the value of coefficient may be directly influenced by the method used. For streams with flow up to 0.227 m3s‐1, the longitudinal dispersion coefficients ranged from 0.10 to 1.21 m2s‐1, while the larger water courses had coefficients greater than 4.64 m2s‐1, reaching to 17.04 m2s‐1. Results from five empirical equations were compared with the data obtained in the field. The equation proposed by Devens et al. (2010 ) showed greater adherence to the values measured in field trials A mathematical model established by multiple regression analysis of hydraulic characteristics was developed, with Pearson determination coefficient equal to 0.973.
Starting Page	27
Ending Page	36
Page Count	10
File Format	PDF HTM / HTML
DOI	10.21168/rega.v10n2.p27-36
Volume Number	10
Alternate Webpage(s)	https://abrh.s3.sa-east-1.amazonaws.com/Sumarios/163/c23257ea95eae139ec040dec168fb1f0_85f93a715a49bcf9aa5490c9fa9621f1.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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