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Article

Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach

1
Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
2
College of Water Conservancy Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Bommanna Krishnappan
Water 2021, 13(10), 1402; https://doi.org/10.3390/w13101402
Received: 13 April 2021 / Revised: 7 May 2021 / Accepted: 9 May 2021 / Published: 18 May 2021
(This article belongs to the Section Water Erosion and Sediment Transport)
Flooding in a sediment-laden floodplain is affected by riverine beach vegetation and the shape of a meandering compound channel. The laws of water and sediment exchange and the deposition distribution in beach troughs are very complex. These factors play a significant role in the formation and development of secondary suspended rivers, in the adjustment of the beach horizontal gradient, and even in the evolution of the flood control situation. In this study, we used a combination of experimental simulation and theoretical research to carry out a generalized model test of floodplain flooding evolution, analyzed the lateral distribution characteristics of sediment-laden flow and sediment factors in a meandering compound channel under the conditions of beach vegetation, and revealed the pros and cons of beach vegetation on the adjustment of the beach and channel siltation. The model test results of the flooding in the floodplain in the compound channel with meandering vegetation showed that the main stream was not only concentrated in the main channel but also appeared near the foot of the left and right bank levees and formed flood discharges along the embankment. As the riverine beach siltation was mainly concentrated at the riverine beach lip, the vegetation on the riverine beach had a significant effect on slowing down the flow velocity. Whether it was a row or full vegetation on both sides of the bank, this played an important role in the stability of the main channel. When there was no vegetation on the riverine beach, the main channel was easy to move. The arrangement of full vegetation on the riverine beach had a uniform effect on the velocity distribution of the riverine beach, which reduced the phenomenon of excessive velocity at the foot of the riverine beach and increased the velocity effect in the main channel. These results will provide a theoretical basis for the utilization of riverine beach areas and river management in the lower Yellow River and have a great significance for enriching the basic theory of water and sediment movement and promoting the integration of hydraulics, river dynamics, and ecology. View Full-Text
Keywords: curve riverine beach vegetation; floodplain flood; law of water and sediment; riverine beach groove deposition; model experiment curve riverine beach vegetation; floodplain flood; law of water and sediment; riverine beach groove deposition; model experiment
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MDPI and ACS Style

Li, J.; Zhang, M.; Jiang, E.; Pan, L.; Wang, A.; Wang, Y.; Jian, S. Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach. Water 2021, 13, 1402. https://doi.org/10.3390/w13101402

AMA Style

Li J, Zhang M, Jiang E, Pan L, Wang A, Wang Y, Jian S. Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach. Water. 2021; 13(10):1402. https://doi.org/10.3390/w13101402

Chicago/Turabian Style

Li, Junhua, Mingwu Zhang, Enhui Jiang, Li Pan, Aoxue Wang, Yafei Wang, and Shengqi Jian. 2021. "Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach" Water 13, no. 10: 1402. https://doi.org/10.3390/w13101402

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