Effects of submerged vegetation and bed absorption boundary on pollutant transport in wetland

被引：0
|
作者：
Fang H. [1 ]
Yang Z. [1 ]
机构：
[1] State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan
来源：
Shuikexue Jinzhan/Advances in Water Science | 2023年 / 34卷 / 01期
基金：
中国国家自然科学基金;
关键词：
absorption boundary; pollutants transport; random displacement model; submerged vegetation; wetland;
D O I：
10.14042/j.cnki.32.1309.2023.01.012
中图分类号：
O211 [概率论（几率论、或然率论）];
学科分类号：
摘要：
Wetland is an important part of the ecosystem, and the investigation of wetland pollutant migration under the combined effect of submerged vegetation and bed absorption boundary can provide a reference for wetland design and maintenance. The random displacement model based on the Lagrangian method is adopted to simulate the transport process of instantaneously released pollutants in wetlands with dense rigid submerged vegetation and bed absorption boundary by setting different vegetation densities and bed absorption probabilities for the pollutants. Results indicate that the increase of the bed absorption probability accelerates the average migration velocity of the pollutant particle cloud and weakens its longitudinal dispersion, while the increase of vegetation density inhibits the bed absorption, extending the stay and greatly dispersing the distribution of the pollutants in the wetland, thereby giving full play to the comprehensive purification function of the wetland. When the absorption probability exceeds 10%, the absorption boundary of the bed can be regarded as a completely absorptive boundary. Conseqently, the use of a substrate with high absorption probability in wetland design is unnecessary. © 2023 China Water Power Press. All rights reserved.
引用
收藏
页码：126 / 133
页数：7
相关论文
共 26 条
  • [1] CHENG F Y, van METER K J, BYRNES D K, Et al., Maximizing US nitrate removal through wetland protection and restoration, Nature, 588, 7839, pp. 625-630, (2020)
  • [2] TEMMINK R J M, LAMERS L P M, ANGELINI C, Et al., Recovering wetland biogeomorphic feedbacks to restore the world′s biotic carbon hotspots, Science, 376, 6593, (2022)
  • [3] SARKAR D J, DAS SARKAR S, DAS B K, Et al., Occurrence, fate and removal of microplastics as heavy metal vector in natural wastewater treatment wetland system, Water Research, 192, (2021)
  • [4] WANG H L, LI S L, ZHU Z T, Et al., Analyzing solute transport in modeled wetland flows under surface wind and bed absorption conditions, International Journal of Heat and Mass Transfer, 150, (2020)
  • [5] ZHANG Y H, LAI X J, ZHANG L, Et al., Influence of aquatic vegetation on flow structure under wind-driven waves: a case study in Lake Taihu (China) with two typical submerged vegetations, Advances in Water Science, 31, 3, pp. 441-449, (2020)
  • [6] ZHAO H Q, TANG H W, YAN J, Et al., Interactions between bedforms and open channel flows through submerged vegetation, Advances in Water Science, 32, 2, pp. 250-258, (2021)
  • [7] LU Y, WANG W X, LU Y J, Et al., Theoretical and experimental study on resistance characteristics of shrub vegetation distribution area, Advances in Water Science, 31, 4, pp. 556-564, (2020)
  • [8] ZHANG J, HUAI W X, SHI H R, Et al., Estimation of the longitudinal dispersion coefficient using a two-zone model in a channel partially covered with artificial emergent vegetation, Environmental Fluid Mechanics, 21, 1, pp. 155-175, (2021)
  • [9] ZHOU W Z, DONG B, YANG J Z, Et al., Correction of residence time distributions and hydraulic indexes affected by tracer release duration in surface flow constructed wetlands, Journal of Hydrology, 603, (2021)
  • [10] LOU S, LIU H Z, LIU S G, Et al., Longitudinal and lateral diffusion of solute transport in flow with rigid vegetation, Environmental Sciences Europe, 32, (2020)
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