Floating seed dispersal in open channel flow with emergent vegetation
Floating seed dispersal in open channel flow with emergent vegetation
复制标题
带有挺水植被的明渠流中的漂浮种子传播
DOI：
10.1002/eco.2038
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发表时间：
2018-09
期刊：
影响因子：
2.6
通讯作者：
Huai Wenxin
中科院分区：
文献类型：
--
作者：
Liu Xiaoguang;Zeng Yuhong;Huai Wenxin
本文研究了在明渠水流中，树干密度和水流速度对两种漂浮颗粒与刚性植被相互作用过程的影响。提出并验证了漂浮粒子与茎相互作用概率的新定义，进一步探讨了粒子与茎相互作用的过程(包括碰撞和捕获机制)，包括提出并验证了一个碰撞模型，以预测带有修正参数的碰撞概率。我们还建立了一个合适的长度尺度来分析颗粒-茎机制(针对本研究中使用的植被特征和排列)。提出了一种更准确的基于Gamma函数的统计模型来描述非植被区到植被区的漂浮粒子扩散，并与指数模型进行了比较验证，并提出了两个伽玛分布在自然系统中粒子扩散的经验公式。在分析悬浮颗粒所受作用力的基础上，提出了一个无量纲参数来评价附着在茎上的悬浮颗粒的吸引能力。在这些实验中观察到的现象被提出，以供未来的分析和研究。
In this paper, we investigate the effects of stem density and flow velocity on interaction processes between two types of floating particles and rigid emergent vegetation in open channel flow. A new definition of the probability that a floating particle interacts with a stem is proposed and validated, and particle–stem interaction processes (including collision and capture mechanisms) are further explored, including a collision model proposed and validated to predict the probability of collision with a correction parameter. We also establish an appropriate length scale to analyse the particle–stem mechanism (for the vegetation characteristics and arrangement used in this study). A more accurate statistical model based on Gamma function is proposed to describe floating particle dispersal from unvegetated section to vegetated section, which is verified compared with exponential model, and two empirical formulas are proposed to apply the Gamma distribution to the particle dispersal in natural systems. We also propose a dimensionless parameter to evaluate the attraction capacity of the floating particle attached to the stem based on analysing forces acting on the particle. Phenomena observed in these experiments are presented for future analysis and research.
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