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首页> 外文期刊>Journal of Agricultural Engineering >A 2D hydrodynamic-sedimentological model for gravel-bed rivers. Part I: theory and validation
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A 2D hydrodynamic-sedimentological model for gravel-bed rivers. Part I: theory and validation

机译：砾石床河流的二维水动力-沉积学模型。第一部分：理论与验证

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This paper presents a novel 2D-depth average model especially developed for gravel-bed rivers, named Lican-Leufú (Lican=pebble and Leufu=river, in Mapuche’s language, the native inhabitants of Central Patagonia, Argentina). The model consists of three components: a hydrodynamic, a sedimentological, and a morphological model. The flow of water is described by the depth-averaged Reynolds equations for unsteady, free-surface, shallow water flows. It includes the standard k-e model for turbulence closure. Sediment transport can be divided in different size classes (sand-gravel mixture) and the equilibrium approach is used for Exner’s equation. The amour layer is also included in the structure of the model and the surface grain size distribution is also allowed to evolve. The model simulates bank slides that enable channel widening. Models predictions were tested against a flume experiment where a static armour layer was developed under conditions of sediment starvations and general good agreements were found: the model predicted adequately the sediment transport, grain size of transported material, final armour grain size distribution and bed elevation.
机译：本文介绍了一种特别为砾石床河流开发的新颖的二维深度平均模型，名为Lican-Leufú（以马普切的语言命名为Lican = Pebble和Leufu = river，阿根廷中巴塔哥尼亚的原住民）。该模型由三个部分组成：流体动力学模型，沉积模型和形态模型。水的流动由非稳态自由表面浅水流动的深度平均雷诺方程式描述。它包括用于湍流闭合的标准k-e模型。泥沙的输送可以分为不同的大小等级（砂砾混合料），并且Exner方程采用平衡法。在模型的结构中还包含了恋情层，并且还允许演化了表面晶粒尺寸分布。该模型模拟了可扩大通道的堤坝滑梯。模型预测是针对水槽实验进行测试的，该实验在沉积物匮乏的条件下形成了静态装甲层，并且发现了良好的一致性：该模型充分预测了沉积物的运输，所运输物料的粒度，最终装甲粒度分布和床高。

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