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Longitudinal dispersion coefficient in single-channel streams

Deng, ZQ; Bengtsson, Lars LU ; Singh, VP and Adrian, DD (2002) In Journal of Hydraulic Engineering 128(10). p.901-916
Abstract
Using a new channel shape equation for straight channels and a more versatile channel shape or local flow depth equation for natural streams a method is developed for prediction of the longitudinal dispersion coefficient in single-channel natural streams, including straight and meandering ones. The method involves derivation of a new triple integral expression for the longitudinal dispersion coefficient and development of an analytical method for prediction of this coefficient in natural streams. The proposed method is verified using 70 sets of field data collected from 30 streams in the United States ranging from straight manmade canals to sinuous natural rivers. The new method predicts the longitudinal dispersion coefficient, where more... (More)
Using a new channel shape equation for straight channels and a more versatile channel shape or local flow depth equation for natural streams a method is developed for prediction of the longitudinal dispersion coefficient in single-channel natural streams, including straight and meandering ones. The method involves derivation of a new triple integral expression for the longitudinal dispersion coefficient and development of an analytical method for prediction of this coefficient in natural streams. The proposed method is verified using 70 sets of field data collected from 30 streams in the United States ranging from straight manmade canals to sinuous natural rivers. The new method predicts the longitudinal dispersion coefficient, where more than 90% calculated values range from 0.5 to 2 times the observed values. The advantage of the new method is that it is capable of accurately predicting the longitudinal dispersion coefficient in single-channel natural streams without using detailed dye concentration test data. A comparison between the new method and the existing methods shows that the new method significantly improves the prediction of the longitudinal dispersion coefficient. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coefficients, channel flow, wave dispersion, streams
in
Journal of Hydraulic Engineering
volume
128
issue
10
pages
901 - 916
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000178295600003
  • scopus:0036800976
ISSN
1943-7900
DOI
10.1061/(ASCE)0733-9429(2002)128:10(901)
language
English
LU publication?
yes
id
c78c5cf5-1016-432d-8d4f-ecf3267d0c58 (old id 326408)
date added to LUP
2007-08-16 08:35:13
date last changed
2017-06-18 04:33:36
@article{c78c5cf5-1016-432d-8d4f-ecf3267d0c58,
  abstract     = {Using a new channel shape equation for straight channels and a more versatile channel shape or local flow depth equation for natural streams a method is developed for prediction of the longitudinal dispersion coefficient in single-channel natural streams, including straight and meandering ones. The method involves derivation of a new triple integral expression for the longitudinal dispersion coefficient and development of an analytical method for prediction of this coefficient in natural streams. The proposed method is verified using 70 sets of field data collected from 30 streams in the United States ranging from straight manmade canals to sinuous natural rivers. The new method predicts the longitudinal dispersion coefficient, where more than 90% calculated values range from 0.5 to 2 times the observed values. The advantage of the new method is that it is capable of accurately predicting the longitudinal dispersion coefficient in single-channel natural streams without using detailed dye concentration test data. A comparison between the new method and the existing methods shows that the new method significantly improves the prediction of the longitudinal dispersion coefficient.},
  author       = {Deng, ZQ and Bengtsson, Lars and Singh, VP and Adrian, DD},
  issn         = {1943-7900},
  keyword      = {coefficients,channel flow,wave dispersion,streams},
  language     = {eng},
  number       = {10},
  pages        = {901--916},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Hydraulic Engineering},
  title        = {Longitudinal dispersion coefficient in single-channel streams},
  url          = {http://dx.doi.org/10.1061/(ASCE)0733-9429(2002)128:10(901)},
  volume       = {128},
  year         = {2002},
}