气候变化领域集成服务门户(CCPortal): Multiscale Superposition and Decomposition of Field-Measured Suspended Sediment Concentrations: Implications for Extending 1DV Models to Coastal Oceans With Advected Fine Sediments

CCPortal

DOI	10.1029/2020JC016474
	Multiscale Superposition and Decomposition of Field-Measured Suspended Sediment Concentrations: Implications for Extending 1DV Models to Coastal Oceans With Advected Fine Sediments
	Zhang S.; Nielsen P.; Perrochet P.; Jia Y.
发表日期	2021
ISSN	21699275
卷号	126 期号:3
英文摘要	One-dimensional vertical (1DV) diffusion-settling models are practical tools for sediment transport analysis of sands, which is mostly a local process. However, for fine sediments, the observed concentrations C(t) can be mixed via horizontal advection (HA) due to the lower settling velocity, which makes the C(t) not necessarily a local process, thus making 1DV models invalid. It is important to determine the qualitative significance of HA or quantitatively separate HA signals when applying 1DV models to environments with advected fine sediments. Here, novel methods are combined to (1) qualitatively identify the physical mechanisms underlying C(t) variations and determine whether HA is significant via multiscale frequency superposition and (2) quantitatively decompose C(t) components according to their physical mechanisms via spectral filter decomposition. In situ observational data of C(t) and concurrent hydrodynamics in the subaqueous Yellow River Delta is employed to analyze the methods' performance. The decomposed signals are reasonable because they can be interpreted in light of other observed physical processes. The results indicated that M2 tidal advection contributed 8.30% by carrying sediments from 1.6 km upstream of the flood tides, M4 and M6 + M8 tidal resuspension contributed 4.16% and 3.96%, respectively, by periodically resuspending a “fluffy layer.” Waves resuspended sediments from an erosion center 5 km upstream of the flood tides and contributed to 76.49% of the elevated C(t). The proposed methods can exclude HA signals from the measured C(t) to increase the applicability of 1DV models to environments with advected fines when C(t) and hydrodynamics are measured. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	frequency superposition; horizontal advection; in situ observations; local resuspension; spectral analysis; the Yellow River Delta
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186415
作者单位	Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, College of Environmental Science and Engineering, Ocean University of China, Qingdao, China; School of Civil Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, Australia; Center for Hydrogeology and Geothermics, University of Neuchâtel, Neuchâtel, Switzerland
推荐引用方式 GB/T 7714	Zhang S.,Nielsen P.,Perrochet P.,et al. Multiscale Superposition and Decomposition of Field-Measured Suspended Sediment Concentrations: Implications for Extending 1DV Models to Coastal Oceans With Advected Fine Sediments[J],2021,126(3).
APA	Zhang S.,Nielsen P.,Perrochet P.,&Jia Y..(2021).Multiscale Superposition and Decomposition of Field-Measured Suspended Sediment Concentrations: Implications for Extending 1DV Models to Coastal Oceans With Advected Fine Sediments.Journal of Geophysical Research: Oceans,126(3).
MLA	Zhang S.,et al."Multiscale Superposition and Decomposition of Field-Measured Suspended Sediment Concentrations: Implications for Extending 1DV Models to Coastal Oceans With Advected Fine Sediments".Journal of Geophysical Research: Oceans 126.3(2021).