土壤团聚体对泥沙沉降速度的影响

doi:10.16843/j.sswc.2019.06.010

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Abstract [Background] Sediment eroded by water consists largely of soil aggregates. The settling velocity of such aggregates and soil primary particles is of fundamental importance to the processes of sediment transport and deposition in water. However, most currently available process-based soil erosion models are using soil texture or mineral particle distribution, and little consideration is given to aggregates, therefore which cannot fully reflect the transport behavior of sediment.[Methods] Five typical soils including loess soil, cinnamon soil, purple soil, black soil and red soil were used to compare the settling velocity of sediment. The settling velocity of sediment for the undispersed particles (soil particles and aggregates) and dispersed particles(soil particles) were measured using a modified bottom withdrawal tube method. By comparing the results of dispersion and indispersion, the impact of soil aggregates on settling velocity of sediment was analyzed. The data analysis process of this study was completed by Excel 2016. The significance difference test and correlation analysis were carried out by SPSS 23. Origin 2016 was used to complete the fitting of the model and the drawing of the graphs.[Results] Aggregates had a significant effect on settling velocity of sediment. For the tested soils, the aggregates resulted in the increase in settling velocity. Aggregates had more obvious effect on the settling velocity of small particles than that of the large particles. Among the different soil types, the effect of aggregates on the increasing rate in settling velocity of purple soil, black soil, red soil, loess soil and cinnamon soil decreased in turn, and the main reason was that the characteristics of soil particles (including soil primary particles and aggregates)were different. Among the soil characteristic parameters, the mean weight diameter of aggregates and aggregation degree had more important effect on sediment settling velocity. The increasing rate in settling velocity was significantly correlated to the mean weight diameter of aggregates and aggregation degree.[Conclusions] The results indicate that there is a great difference between the settling velocity of sediment containing aggregates and only soil particles. The mean weight diameter of aggregates or aggregation degree may be a proper parameter for reflecting the effects of aggregates on settling velocity of sediment. It is of great significance for considering the influence of aggregates in the process of sediment settling to understand the law of sediment movement, study the mechanism of erosion process and even develop the process-based soil erosion models.

Key words： settling velocity aggregates soil characteristics settling tube

Received: 29 October 2018

PACS:

S157.1

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	WU Sinan
	FU Suhua

Cite this article:

WU Sinan,FU Suhua. Effects of soil aggregates on settling velocity of sediment[J]. SSWC, 2019, 17(6): 78-84.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.06.010 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I6/78

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