Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024335 |
Impact of Vegetation-Generated Turbulence on the Critical, Near-Bed, Wave-velocity for Sediment Resuspension | |
Tang, Caihong1,2; Lei, Jiarui1; Nepf, Heidi M.1 | |
2019-07-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:7页码:5904-5917 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Laboratory experiments examined the impact of model vegetation on wave-driven resuspension. Model canopies were constructed from cylinders with three diameters (d = 0.32, 0.64, and 1.26 cm) and 12 densities (cylinders/m(2)) up to a solid volume fraction (phi) of 10%. The sediment bed consisted of spherical grains with d(50) = 85 mu m. For each experiment, the wave velocity was gradually adjusted by increasing the amplitude of 2-s waves in a stepwise fashion. A Nortek Vectrino sampled the velocity at z = 1.3 cm above the bed. The critical wave orbital velocity for resuspension was inferred from records of suspended sediment concentration (measured with optical backscatter) as a function of wave velocity. The critical wave velocity decreased with increasing solid volume fraction. The reduction in critical wave velocity was linked to stem-generated turbulence, which, for the same wave velocity, increased with increasing solid volume fraction. The measured turbulence was consistent with a wave-modified version of a stem-turbulence model. The measurements suggested that a critical value of turbulent kinetic energy was needed to initiate resuspension, and this was used to define the critical wave velocity as a function of solid volume fraction. The model predicted the measured critical wave velocity for stem diameters d = 0.64 to 2 cm. Combining the critical wave velocity with an existing model for wave damping defined the meadow size for which wave damping would be sufficient to suppress wave-induced sediment suspension within the interior of the meadow. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000481444700041 |
WOS关键词 | SUBMERGED MODEL CANOPIES ; ZOSTERA-MARINA ; KINETIC-ENERGY ; FLOW ; TRANSPORT ; FIELD ; HYDRODYNAMICS ; ACCUMULATION ; SEAGRASSES ; DISPERSION |
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/184862 |
专题 | 资源环境科学 |
作者单位 | 1.MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 2.Beijing Normal Univ, Sch Environm, Key Lab Water & Sediment Sci, Minist Educ, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Tang, Caihong,Lei, Jiarui,Nepf, Heidi M.. Impact of Vegetation-Generated Turbulence on the Critical, Near-Bed, Wave-velocity for Sediment Resuspension[J]. WATER RESOURCES RESEARCH,2019,55(7):5904-5917. |
APA | Tang, Caihong,Lei, Jiarui,&Nepf, Heidi M..(2019).Impact of Vegetation-Generated Turbulence on the Critical, Near-Bed, Wave-velocity for Sediment Resuspension.WATER RESOURCES RESEARCH,55(7),5904-5917. |
MLA | Tang, Caihong,et al."Impact of Vegetation-Generated Turbulence on the Critical, Near-Bed, Wave-velocity for Sediment Resuspension".WATER RESOURCES RESEARCH 55.7(2019):5904-5917. |
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