Semi-analytical study on environmental dispersion of settling particles in a width-independent wetland flow

Nanda Poddar, Susmita Das, Subham Dhar, Kajal Kumar Mondal

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Predicting the evolution of environmental dispersion of settling particles in wetland flows has a wide range of applications in ecological engineering. In the current research work, the dispersion phenomena in a two dimensional width-independent concentration field of settling pollutants is studied using a semi-analytical approach based on the method of integral moments. A finite difference implicit scheme is used to solve the time dependent advection-diffusion equation. The influence of different physical parameters such as settling velocity, Peclet number, vegetation parameter and dispersion time on the spreading of instantaneous and uniform release of tracers in a homogeneous fully vegetated wetland channel flow is analyzed. Hermite polynomial representation is employed to determine the longitudinal distribution of mean concentration. It is seen that with the increment of vegetation parameter, the Taylor dispersivity decreases because vegetation parameter resists the flow velocity. Also, with the enhancement of dispersion time, mean concentration of settling pollutants decreases and it expanded more along longitudinally. It is remarkable that the peak of the mean concentration of the pollutants reduce as settling velocity increases.

Original languageEnglish
Pages (from-to)1069-1090
Number of pages22
JournalEnvironmental Fluid Mechanics
Volume21
Issue number5
DOIs
StatePublished - 1 Oct 2021
Externally publishedYes

Keywords

  • 2D width-independent wetland
  • Dispersion
  • Method of moments
  • Semi analytical method
  • Settling velocity

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology

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