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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Numerical study on the effects of floodplain vegetation on river planform style
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Numerical study on the effects of floodplain vegetation on river planform style

机译：洪泛区植被对河流塑造方式影响的数值研究

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The effects of floodplain vegetation on river planform have been investigated for a medium-sized river using a 2D morphodynamic model with submodels for flow resistance and plant colonization. The flow resistance was divided into a resistance exerted by the soil and a resistance exerted by the plants. In this way it was possible to reproduce both the decrease in bed shear stress, reducing the sediment transport capacity of the flow within the plants, and the increase in hydraulic resistance, reducing the flow velocities. Colonization by plants was obtained by instantaneously assigning vegetation to the areas that became dry at low water stages. This colonization presents a step forward in the modelling of bank accretion. Bank erosion was related to bed degradation at adjacent wet cells. Bank advance and retreat were reproduced as drying and wetting of the computational cells at the channel margins. The model was applied to a hypothetical case with the same characteristics as the Allier River (France). The river was allowed to develop its own geometry starting from a straight, uniform, channel. Different vegetation densities produced different planforms. With bare floodplains, the river always developed a braided planform, even if the discharge was constant and below bankfull. With the highest vegetation density (grass) the flow concentrated in a single channel and formed incipient meanders. Lower vegetation density (pioneer vegetation) led to a transitional planform, with a low degree of braiding and distinguishable incipient meanders. The results comply with flume experiments and field observations reported in the literature.
机译：利用2D形态学模型研究了使用子模型进行流动性和植物殖民化的中型河流对河流植被对河流植被的影响。流动阻力分为土壤施加的电阻和植物施加的电阻。以这种方式，可以再现床剪切应力的减小，降低植物内流量的沉积物输送能力，以及液压阻力的增加，降低流速。通过将植物瞬间将植被分配给低水平变得干燥的区域来获得植物的定植。这种殖民化在银行增量的建模中提出了一步。银行侵蚀与邻近湿细胞的床降解有关。银行进程和退缩被复制为通道边距计算电池的干燥和润湿。该模型应用于具有与Allier River（法国）相同特征的假设案例。允许从直线，统一，通道开始开发自己的几何形状。不同的植被密度产生不同的平面形状。随着裸露的洪泛平坦，河流总是开发了一种编织的平面形变，即使放电是恒定的，下面的银行。具有最高的植被密度（草）流量集中在单个通道中并形成初期蜿蜒。较低的植被密度（先驱植被）导致过渡平面型，具有低程度的编织和可区分的初期蜿蜒。结果符合在文献中报告的水槽实验和现场观察。

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