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Sökning: WFRF:(Deng ZQ)

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  • Deng, ZQ, et al. (författare)
  • Longitudinal dispersion coefficient in single-channel streams
  • 2002
  • Ingår i: Journal of Hydraulic Engineering. - 1943-7900. ; 128:10, s. 901-916
  • Tidskriftsartikel (refereegranskat)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.
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3.
  • Deng, ZQ, et al. (författare)
  • Numerical solution of fractional advection-dispersion equation
  • 2004
  • Ingår i: Journal of Hydraulic Engineering. - 1943-7900. ; 130:5, s. 422-431
  • Tidskriftsartikel (refereegranskat)abstract
    • Numerical schemes and stability criteria are developed for solution of the one-dimensional fractional advection-dispersion equation (FRADE) derived by revising Fick's first law. Employing 74 sets of dye test data measured on natural streams, it is found that the fractional order F of the partial differential operator acting on the dispersion term varies around the most frequently occurring value of F = 1.65 in the range of 1.4 to 2.0. Two series expansions are proposed for approximation of the limit definitions of fractional derivatives. On this ground, two three-term finite-difference schemes-"1.3 Backward Scheme" having the first-order accuracy and "F.3 Central Scheme" possessing the F-th order accuracy-are presented for fractional order derivatives. The F.3 scheme is found to perform better than does the 1.3 scheme in terms of error and stability analyses and is thus recommended for numerical solution of FRADE. The fractional dispersion model characterized by the FRADE and the F.3 scheme can accurately simulate the long-tailed dispersion processes in natural rivers.
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  • Resultat 1-6 av 6

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