AI Article Synopsis
- - The study explores how vertical mass exchange and turbulent vortex interactions affect solute distribution and the purification efficiency of wetlands dealing with nutrient-rich (eutrophic) waters.
- - Key findings indicate that vegetation density and height slow down solute diffusion, while there's a critical threshold for bed absorption that influences near-bed concentration.
- - It is essential to understand the dual effects of submerged vegetation, as they enhance vertical mass exchange but hinder solute absorption, which informs better management practices for wetland ecosystems.
Article Abstract
Vertical mass exchange hugely changes the solute distribution with the effects of shear layers and multiple-scale turbulent vortices, and then impacts the effectiveness of wetlands in purifying eutrophic water bodies. This study aims to investigate vertical mass exchange mechanisms in wetland systems and to provide theoretical guidance for optimizing the purification efficiency of wetland water quality. We simulate solute diffusion behaviors originating from a continuous point source with vegetated shear layers and bed absorptions through the adopted numerical simulation method, random walk method. The simulated results mainly contributed to three findings: (1) Vegetation features (density and height) inhibit solute diffusion, resulting in a prolonged steady time required for the cross-sectional concentration to reach equilibrium. (2) There is a threshold for the bed absorption probabilities to impact near-bed concentration distribution, that is the 10% absorption probability, over which the variation of bed absorption has few effects on the solute concentration. (3) The shear layer at the top of vegetation promotes vertical mass exchange while preventing solutes above the wake zone from being absorbed by the bed. In practice, the dual effects of submerged vegetation on vertical mass exchange should be comprehensively considered to ensure the effective functioning of wetland ecosystems.
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| http://dx.doi.org/10.1016/j.jenvman.2024.123511 | DOI Listing |
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