Fractal characterization of sediment particle-size distribution in the water-level fluctuation zone of the Three Gorges Reservoir, China

A - Papers appearing in refereed journals

Li, J-L, Bao, Y-H, Wei, J., He, X-B, Tang, Q. and Namajimana, J. de Dieu 2019. Fractal characterization of sediment particle-size distribution in the water-level fluctuation zone of the Three Gorges Reservoir, China. Journal of Mountain Science. 16 (9), pp. 2020-2038.

AuthorsLi, J-L, Bao, Y-H, Wei, J., He, X-B, Tang, Q. and Namajimana, J. de Dieu
Abstract

The combined effect of periodic water impoundment and seasonal natural flood events has created a 30 m high water-level fluctuation zone (WLFZ) around the Three Gorges Reservoir (TGR), China, forming a unique eco-landscape. Siltation, eutrophication, enrichment of heavy metals, and methane emissions in the WLFZ have been widely associated with sediment and soil particles generated from the upstream catchment or upland slopes. However, little attention has been paid to the complexity of sediment particle-size distributions in the WLFZ. In the present study, core samples (from a 345 cm thick sediment core from the base of the WLFZ), slope transect surface samples (across/up a WLFZ slope), and along-river/longitudinal surface samples (from the reservoir reaches) were collected. Laser granulometry and a volume-based fractal model were used to reveal the characteristics of sediment particle-size distributions. Results indicate that the alternation of coarse and fine particles in the sedimentary core profile is represented as a fluctuation of low and high values of fractal dimension (D), ranging from 2.59 to 2.77. On the WLFZ slope transect, surface sediment particles coarsen with increasing elevation, sand content increases from 3.3% to 78.5%, and D decreases from 2.76 to 2.53. Longitudinally, surface sediments demonstrate a downstream-fining trend, and D increases gradually downstream. D is significantly positively correlated with the fine particle content. We conclude that D is a useful measure for evaluating sediment particle-size distribution.

KeywordsSpatial differentiation ; Sediment particle; Fractal dimension ; Water level fluctuation zone; Three Gorges Reservoir
Year of Publication2019
JournalJournal of Mountain Science
Journal citation16 (9), pp. 2020-2038
Digital Object Identifier (DOI)doi:110.1007/s11629-019-5456-1
Web address (URL)https://link.springer.com/article/10.1007%2Fs11629-019-5456-1
Open accessPublished as non-open access
FunderNational Natural Science Foundation of China
Output statusPublished
Publication dates
Online18 Jul 2019
Publication process dates
Accepted18 Jun 2019
PublisherScience Press
ISSN1672-6316

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