Study of the transverse distribution of suspended sediment concentration in compound channel with emergent vegetation on floodplain

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-05-04 DOI:10.1016/j.jhydrol.2025.133444

Da Li , Zhonghua Yang , Song Zhang , Man Guo

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引用次数: 0

Abstract

Vegetation which widely exists in natural river ecosystem plays a significant role in water purification, river evolution and soil conservation. Understanding how the vegetation on floodplain influences the transport and distribution of suspended sediment is the prerequisite for studying the erosion and deposition of riverbed and the changes of water quality. Therefore, this paper adopted flume experiments and theoretical analysis to investigate the influence of floodplain with emergent vegetation on the transport of suspended sediment in compound channel. It was found that the depth-averaged suspended sediment concentration (SSC) decreases from the main channel to the floodplain as a whole. And the averaged SSC of the whole cross section decreases from 0.34 kg/m³ to 0.04 kg/m³ with the vegetation density increasing from 0 to 1.56 m⁻¹ in the experiments, which leads to more deposited sediment. At the same time, it was observed that the deposited sediment was transferred from the main channel to the vegetated floodplain. Then, this study established the transverse distribution model of the depth-averaged SSC under the influence of emergent vegetation on floodplain with the bottom turbulence and large coherent structure being considered. The validation results indicated the model has good accuracy and correlation. It provides the theoretical foundation for quantifying the sediment transport capacity in the compound channel with vegetated floodplain, which is helpful for the restoration and protection of ecological river.

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洪泛平原突发性植被复合河道悬沙浓度横向分布研究

植被广泛存在于天然河流生态系统中，在水体净化、河流演变和土壤保持等方面发挥着重要作用。了解河漫滩植被对悬沙运移和分布的影响，是研究河床侵蚀沉积和水质变化的前提。因此，本文采用水槽试验和理论分析相结合的方法，研究了含突发性植被的漫滩对复合河道悬沙输运的影响。研究发现，从主河道到河漫滩，深度平均悬沙浓度总体呈下降趋势。随着植被密度从0增加到1.56 m−1，整个剖面的平均SSC从0.34 kg/m3减少到0.04 kg/m3，导致泥沙淤积增多。同时，还观察到泥沙从主河道向植被覆盖的漫滩转移。在此基础上，建立了考虑底层湍流和大相干结构的洪泛平原突发性植被影响下深度平均SSC横向分布模型。验证结果表明，该模型具有良好的准确性和相关性。这为植被泛滥平原复合河道输沙量的量化提供了理论依据，有助于生态河流的恢复与保护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.