Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020628 |
Modeling sediment transport with an integrated view of the biofilm effects | |
Fang, H. W.; Lai, H. J.; Cheng, W.; Huang, L.; He, G. J. | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Most natural sediment is invariably covered by biofilms in reservoirs and lakes, which have significant influence on bed form dynamics and sediment transport, and also play a crucial role in natural river evolution, pollutant transport, and habitat changes. However, most models for sediment transport are based on experiments using clean sediments without biological materials. In this study, a three-dimensional mathematical model of hydrodynamics and sediment transport is presented with a comprehensive consideration of the biofilm effects. The changes of the bed resistance mainly due to the different bed form dynamics of the biofilm-coated sediment (biosediment), which affect the hydrodynamic characteristics, are considered. Moreover, the variations of parameters related to sediment transport after the biofilm growth are integrated, including the significant changes of the incipient velocity, settling velocity, reference concentration, and equilibrium bed load transport rate. The proposed model is applied to evaluate the effects of biofilms on the hydrodynamic characteristics and sediment transport in laboratory experiments. Results indicate that the mean velocity increases after the biofilm growth, and the turbulence intensity near the river bed decreases under the same flow condition. Meanwhile, biofilm inhibits sediment from moving independently. Thus, the moderate erosion is observed for biosediment resulting in smaller suspended sediment concentrations. The proposed model can reasonably reflect these sediment transport characteristics with biofilms, and the approach to integration of the biological impact could also be used in other modeling of sediment transport, which can be further applied to provide references for the integrated management of natural aqueous systems. |
英文关键词 | biofilm hydrodynamics bed form dynamics sediment transport three-dimensional model |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200003 |
WOS关键词 | EXTRACELLULAR POLYMERIC SUBSTANCES ; FRESH-WATER SEDIMENTS ; OPEN-CHANNEL FLOW ; SUSPENDED-SEDIMENT ; EXOPOLYMERIC SUBSTANCES ; INTERTIDAL SEDIMENTS ; LITTORAL SEDIMENTS ; COHESIVE SEDIMENTS ; EROSION RATES ; BIOFLOCCULATION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/21865 |
专题 | 资源环境科学 |
作者单位 | Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Fang, H. W.,Lai, H. J.,Cheng, W.,et al. Modeling sediment transport with an integrated view of the biofilm effects[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Fang, H. W.,Lai, H. J.,Cheng, W.,Huang, L.,&He, G. J..(2017).Modeling sediment transport with an integrated view of the biofilm effects.WATER RESOURCES RESEARCH,53(9). |
MLA | Fang, H. W.,et al."Modeling sediment transport with an integrated view of the biofilm effects".WATER RESOURCES RESEARCH 53.9(2017). |
条目包含的文件 | 条目无相关文件。 |
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