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Article

The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface

1
College of Urban and Environmental Sciences, Northwest University, Xi’an 710127, China
2
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China
3
Institute of Qinling Mountains, Northwest University, Xi’an 710127, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3467; https://doi.org/10.3390/w12123467
Received: 28 September 2020 / Revised: 1 December 2020 / Accepted: 8 December 2020 / Published: 10 December 2020
(This article belongs to the Special Issue Advances in Environmental Hydraulics)
The bioturbation activity of macroinvertebrates can affect the level of water exchange across the sediment–water interface. The impact of tubificid worm with different densities on the vertical water exchange at the sediment–water interface was investigated based on laboratory flume experiments. Vertical water fluxes, as well as physiochemical parameters, were measured at seven-day intervals, and the maximum penetration depths were obtained by dye injection before and after the tubificid bioturbation experiment, respectively. The bioturbation effects can be summarized in two aspects: (1) when the density was less than (or equal to) 20 individual/10 cm2, the volume of vertical water exchange positively correlated with the tubificid bioturbation. Once the density exceeded (or equaled) 25 individual/10 cm2, the vertical water flux decreased with increasing tubificid bioturbation. After 14 to 21 days, a negative correlation was identified between the bioturbation and the vertical water flux under all biological densities. (2) The maximum depth that the surface water can penetrate the sediment increased with increasing tubificid density. These results revealed that the vertical water was closely related to the biological density. The study has certain reference significance to understanding the spatiotemporal heterogeneity of hyporheic water exchange on a local scale. View Full-Text
Keywords: tubificid bioturbation; vertical water exchange; sediment–water interface; tubificid density; experiment duration tubificid bioturbation; vertical water exchange; sediment–water interface; tubificid density; experiment duration
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MDPI and ACS Style

Mao, R.; Wu, J.; Qin, X.; Ma, C.; Song, J.; Cheng, D.; Sun, H.; Li, M. The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface. Water 2020, 12, 3467. https://doi.org/10.3390/w12123467

AMA Style

Mao R, Wu J, Qin X, Ma C, Song J, Cheng D, Sun H, Li M. The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface. Water. 2020; 12(12):3467. https://doi.org/10.3390/w12123467

Chicago/Turabian Style

Mao, Ruichen, Jintao Wu, Xin Qin, Chi Ma, Jinxi Song, Dandong Cheng, Haotian Sun, and Mingyue Li. 2020. "The Effect of Tubificid Bioturbation on Vertical Water Exchange across the Sediment–Water Interface" Water 12, no. 12: 3467. https://doi.org/10.3390/w12123467

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