Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR030776 |
From Substrate to Surface: A Turbulence-based Model for Gas Transfer across Sediment-water-air Interfaces in Vegetated Streams | |
Chien-Yung Tseng; Rafael O. Tinoco | |
2021-12-08 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Dissolved Oxygen (DO) fluxes across the air-water and sediment-water interface (AWI and SWI) are two major processes that govern the amount of oxygen available to living organisms in aquatic ecosystems. Aquatic vegetation generates different scales of turbulence that change the flow structure and affect gas transfer mechanisms at AWI and SWI. A series of laboratory experiments with rigid cylinder arrays to mimic vegetation was conducted in a recirculating race-track flume with a lightweight sediment bed. 2D Planar Particle Image Velocimetry was used to characterize the flow field under different submergence ratios and array densities to access the effect of vegetation-generated turbulence on gas transfer. Gas transfer rate across AWI was determined by DO re-aeration curves. The effective diffusion coefficient for gas transfer flux across SWI was estimated by the difference between near-bed and near-surface DO concentrations. When sediment begins to mobilize, near-bed suspended sediment provides a negative buoyancy term that increases the critical Reynolds number for the surface gas transfer process according to a modified Surface Renewal model for vegetated flows. A new Reynolds number dependence model using near-bed turbulent kinetic energy as an indicator is proposed to provide a universal prediction for the interfacial flux across SWI in flows with aquatic vegetation. This study provides critical information and useful models for future studies on water quality management and ecosystem restoration in natural water environments such as lakes, rivers, and wetlands. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/343020 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Chien-Yung Tseng,Rafael O. Tinoco. From Substrate to Surface: A Turbulence-based Model for Gas Transfer across Sediment-water-air Interfaces in Vegetated Streams[J]. Water Resources Research,2021. |
APA | Chien-Yung Tseng,&Rafael O. Tinoco.(2021).From Substrate to Surface: A Turbulence-based Model for Gas Transfer across Sediment-water-air Interfaces in Vegetated Streams.Water Resources Research. |
MLA | Chien-Yung Tseng,et al."From Substrate to Surface: A Turbulence-based Model for Gas Transfer across Sediment-water-air Interfaces in Vegetated Streams".Water Resources Research (2021). |
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