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Dispersion in Rivers, Estuaries and Costal Zones
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Dispersion in Rivers, Estuaries and Costal Zones

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydraulics and Hydrodynamics".

Deadline for manuscript submissions: 25 May 2025 | Viewed by 897

Special Issue Editor

Dr. Piotr Zima

E-Mail Website
Guest Editor
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland
Interests: hydraulics; hydrology; fluid mechanics; migration of pollutants; numerical mod-eling and simulation; water management
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Dispersion is one of the processes that occurs during the transport of pollutants in flowing waters. The mass of the added substance, its momentum, and its energy are subject to dispersion. The phenomenon of the dispersion of mass, momentum, and energy is of great importance in transport processes in flowing waters, and, in particular, in the transport of pollutants. This process can be described by the transport equation referring to the gradient of the dispersing quantity, and its intensity depends on its determined or assumed coefficients. The commonly used methods for determining dispersion coefficients refer to the gradient velocity profile, typical for rivers. In the coastal zone, on the other hand, the velocity profile changes from gradient to drift, when shear stresses on the surface, caused by wind or the difference in density of fresh and salt water, begin to dominate. Articles on theoretical, physical, and numerical studies on the phenomenon of dispersion occurring in rivers, estuaries, and coastal waters are welcome.

Dr. Piotr Zima
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • dispersion
  • parameters of dispersion
  • rivers
  • estuaries
  • costal zones

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Published Papers (1 paper)

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Research

13 pages, 8622 KiB  
Article
Numerical Analysis of the Influence of 2D Dispersion Parameters on the Spread of Pollutants in the Coastal Zone
by Piotr Zima and Jerzy Sawicki
Water 2024, 16(24), 3637; https://doi.org/10.3390/w16243637 - 17 Dec 2024
Viewed by 712
Abstract
The transport of pollutants with flowing waters is one of the most common processes in the natural environment. In general, this process is described by a system of differential equations, including the continuity equation, dynamic equations, pollutant transport equations and equations of state. [...] Read more.
The transport of pollutants with flowing waters is one of the most common processes in the natural environment. In general, this process is described by a system of differential equations, including the continuity equation, dynamic equations, pollutant transport equations and equations of state. For the analyzed problem of pollutant migration in wide rivers and the coastal zone, a two-dimensional model is particularly useful because the velocity and mass concentration profile is vertically averaged. In this model, taking into account the dispersion flux leads to appropriate equations, and the dispersion process is described by the dispersion tensor. Due to the transverse isotropy of the dispersion process, the coordinates of this tensor are expressed in terms of local dispersion coefficients along the direction of the velocity and in the direction perpendicular to it. Commonly used methods for determining mass dispersion coefficients refer to a gradient velocity profile, typical for rivers. However, in the coastal zone, the velocity profile changes from gradient to drift when shear stresses on the surface caused by the wind begin to dominate. The drift profile also occurs in estuaries, where there is a difference in the density of fresh and salt water. This paper analyzes the numerical solution of the two-dimensional dispersion equations in the coastal zone for the dispersion coefficients adopted for the gradient and drift velocity profiles and then assesses how this affects the final result. Four typical scenarios of pollutant migration in the coastal zone of the Bay of Puck are presented. The calculated dispersion coefficients differ significantly depending on the adopted velocity profile: for the gradient, DLG = 0.17 [m2/s], and for the drift, DLD = 89.94 [m2/s]. Full article
(This article belongs to the Special Issue Dispersion in Rivers, Estuaries and Costal Zones)
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