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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Simulation of individual particle movement in a gravel streambed
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Simulation of individual particle movement in a gravel streambed

机译：模拟砾石流化床中单个粒子的运动

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摘要

A two-dimensional simulation model of travel distances of individual particles in a gravel-bed river is presented. The model is based on a number of rules, which include particle size, entrainment, trajectory, distance of movement and entrapment. Particle interactions are controlled by resistance fields defined about each obstacle and critical elevation defined in the model. Resistance fields, particle dropping and critical elevation rules control particle interactions. The interaction rules cause the particles to develop pebble clusters, stone cells and transverse structures (transverse ribs). The simulated travel distances of individual particles are consistent with reported field results. Individual particle travel distances were simulated using two different models; one without interactions, between the individual particles and the stationary bed and one with interactions. The case without interactions demonstrates the random nature of sediment transport, and narrow ranges of travel distances. Wider ranges of travel distances, similar to those for natural situations, were obtained for the cases with interactions. The more intense the interaction between the mobile stones and the stationary ones, the wider the range of distances of travel for a given particle size. Modelling the mean travel distance yielded a result similar to that published previously, which was based on empirical data. Well developed bed-surface structures were obtained for relatively poorly sorted sediment with intense interactions between particles. Transverse structures developed when relatively large particles were allowed to move.
机译：提出了砾石河道中单个颗粒传播距离的二维模拟模型。该模型基于许多规则，包括粒径，夹带，轨迹，移动距离和截留。粒子相互作用由围绕每个障碍定义的阻力场和模型中定义的临界高度控制。阻力场，粒子掉落和临界高程规则控制粒子之间的相互作用。相互作用规则使颗粒形成卵石簇，石细胞和横向结构（横向肋骨）。单个粒子的模拟行进距离与报告的现场结果一致。使用两个不同的模型模拟了单个粒子的行进距离;一种没有相互作用，在各个颗粒和固定床之间，另一种没有相互作用。没有相互作用的情况表明了泥沙输送的随机性，并且行进距离范围狭窄。对于具有交互作用的情况，获得了与自然情况类似的更宽的行进距离范围。在给定的粒度下，活动石与固定石之间的相互作用越强烈，行进距离的范围就越广。对平均行进距离进行建模得出的结果与先前基于经验数据发布的结果相似。对于相对较差分类的沉积物，粒子之间存在强烈的相互作用，获得了发育良好的床表面结构。当允许较大的粒子运动时，就会形成横向结构。

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