Flow depth, velocity, and sediment motions in a straight widened channel with vegetated floodplains
Flow depth, velocity, and sediment motions in a straight widened channel with vegetated floodplains
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具有植被泛滥平原的直加宽河道中的水流深度、速度和沉积物运动
DOI：
10.1007/s10652-021-09783-9
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发表时间：
2021-03
影响因子：
2.2
通讯作者：
Liu Xingnian
中科院分区：
文献类型：
--
作者：
Li Fujian;Shan Yuqi;Huang Sheng;Liu Chao;Liu Xingnian
以我国某山区真实的相似形状的航道为基础，在由单一航道拓宽为复合航道的平直航道中进行了试验研究。水流先进入单一河道，然后进入有植被漫滩的复合河道。通道在单通道和复合通道之间的界面处加宽，导致单通道和复合通道之间的不同流动深度。提出了一个计算公式来估算水流深度从单通道到复合通道的减少百分比。植被增加了漫滩阻力，导致更多的水在主渠道流动，并产生更大的平均流速在主渠道相对于nonvegetated的情况下。在复合河道中，流速达到最大值后逐渐减小，直至达到一个常数。泥沙运动（推移质与淤积）由局部床面切力和临界床面切力决定。当局部床面切力小于临界床面切力时，泥沙在复式河槽中沉积。当漫滩植被，增加主河道流速增强当地的床面剪切，超过了临界床面剪切，因此，沉积的泥沙重新启动，并向下游移动，没有沉积观察。
Experiments were conducted in a straight channel that widens from a single channel to a compound channel based on a real navigation channel with a similar shape in a mountainous region of China. Flow entered the single channel and then the compound channel with vegetated floodplains. The channel widened at the interface between the single and compound channels, resulting in different flow depths between the single and compound channels. An equation was proposed to estimate the percentage that the flow depth decreased from the single channel to the compound channel. Vegetation increased the floodplain resistance, causing more water to flow in the main channel and yielding a greater mean velocity in the main channel relative to the nonvegetated case. The velocity reached a maximum and gradually decreased until reaching a constant in the compound channel. Sediment motion (bedload vs. deposition) was determined by the local bed shear and the critical bed shear. Sediment was deposited in the compound channel at the position where the local bed shear was smaller than the critical bed shear. When the floodplains were vegetated, the increase in the main channel velocity enhanced the local bed shear, which surpassed the critical bed shear; thus, deposited sediment was reinitiated and moved downstream, and no deposition was observed.
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影响因子：
--
作者：
Chao Liu;Xing-nian Liu;Kejun Yang
通讯作者：
Chao Liu;Xing-nian Liu;Kejun Yang
用于预测具有模型植被斑块的通道中速度纵向剖面的分析模型
影响因子：
6.4
作者：
Liu Chao;Shan Yuqi
通讯作者：
Shan Yuqi
DOI：
10.1017/cbo9780511806049.003
发表时间：
1995-01
期刊：
--
影响因子：
--
作者：
P. Julien
通讯作者：
P. Julien
DOI：
--
发表时间：
2010
期刊：
--
影响因子：
--
作者：
J. Chlebek;D. Bousmar;D. Knight;M. Sterling
通讯作者：
J. Chlebek;D. Bousmar;D. Knight;M. Sterling
影响因子：
2.4
作者：
Kejun Yang;S. Cao;D. Knight
通讯作者：
Kejun Yang;S. Cao;D. Knight