Modeling anisotropy in free-surface overland and shallow inundation flows.
Modeling anisotropy in free-surface overland and shallow inundation flows.
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DOI：
10.1016/j.advwatres.2017.03.007
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发表时间：
2017-06
影响因子：
4.7
通讯作者：
D. P. Viero;M. Valipour
中科院分区：
文献类型：
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作者：
D. P. Viero;M. Valipour
在自然和人为改变的环境中都可以发现的规则模式，与自由表面流动紧密交织在一起。例如山脊和泥泞的地貌，带有沟渠和沟渠的耕作地形，以及城市地区，其中许多地区的特点是明显的各向异性。在这些情况下，模拟陆上和浅水淹没水流是复杂和苛刻的，特别是当涉及非常不同的空间尺度时。引入各向异性效应来处理二维浅水模型，特别是次网格建模技术。算例表明，各向异性在浅层流动中起着关键作用，其次，各向异性可以通过低计算量和保持网格无关性被子网格模型有效地捕捉到。用原始计算单元的五分之一在较粗的网格上准确地再现了高分辨率的模型结果，速度提高了20多倍。次网格方法可用于基于物理的、大规模的洪泛区淹没过程模拟、灌溉科学以及流域尺度的高分辨率水动力-水文模拟。
Regular patterns, which are found in both natural and man-modified environments, are strongly interwoven with free-surface flows. Examples are ridge and slough landscapes, cultivated terrains with ditches and furrows, and urban areas, with many of them characterized by a marked anisotropy. Simulation of overland and shallow inundation flows in these contexts is complex and demanding, especially if very different spatial scales are involved. Anisotropic effects are introduced to cope with two-dimensional shallow water models and, particularly, with the subgrid modeling technique. Application to schematic test cases shows the key role played by anisotropy in shallow flows, and second, that anisotropy can be effectively captured by the subgrid model with low computational effort and preserving mesh-independentness. High-resolution model results are accurately reproduced on coarser meshes using one fiftieth of the original computational elements, with a speed-up of more than 20. The subgrid approach could serve in view of physically based, large-scale modeling of floodplain inundation processes, in irrigation science, and in high-resolution hydrodynamic-hydrological simulations at the basin scale.