A new approach for simulating the redistribution of soil particles by water erosion: A marker-in-cell model
A new approach for simulating the redistribution of soil particles by water erosion: A marker-in-cell model
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DOI：
10.1029/2012jf002499
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发表时间：
2012-12
影响因子：
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通讯作者：
J. Cooper;J. Wainwright;A. Parsons;Y. Onda;Tomomi Fukuwara;E. Obana;Ben G B Kitchener;E. Long;Graham H. Hargrave
中科院分区：
文献类型：
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作者：
J. Cooper;J. Wainwright;A. Parsons;Y. Onda;Tomomi Fukuwara;E. Obana;Ben G B Kitchener;E. Long;Graham H. Hargrave
[1]目前还没有基于过程的方法，可以在空间尺度上对山坡土壤再分布的详细空间信息进行建模，从而适合于研究斜坡过程。为此，我们建立了一种新的土壤侵蚀模型——细胞内标记模型，该模型模拟了降雨期间土壤的再分配。该模型是基于细胞和粒子的混合技术。一个基于细胞的模型被用来确定在细胞尺度上发生在山坡上的水文和水力。代表沉积物的标记，然后根据这些属性在网格中移动。侵蚀的空间格局直接由标记物的性质决定。该模型允许在一个计算效率高的框架内模拟单个粒子在山坡上运动的二维空间模式。我们使用从图尺度的降雨模拟实验中收集的数据对该模型进行了测试。我们测量了富含137cs的示踪土壤的再分布，以解决单一高强度降雨事件造成的侵蚀的空间格局。该模型能够重现地块上发生的水文和水力学的关键时空方面，以及富含137cs的示踪土壤的空间再分布。该模型的发展用于探索我们对如何研究土壤侵蚀过程的理解。由于缺乏不同模型组成部分的经验基础，因此需要在粒度尺度上理解土壤侵蚀过程的时空动态，以便更好地理解分离和运输过程。
[1] There are currently no process-based approaches that allow detailed spatial information on soil redistribution on hillslopes to be modeled at spatial scales that are appropriate for studying slope processes. In response, we developed a new type of soil-erosion model, a marker-in-cell model, which simulates the redistribution of soil during rainfall events. The model is a hybrid of cell- and particle-based techniques. A cell-based model is used to determine the hydrology and hydraulics occurring at the cellular scale on the hillslope. Markers, representing sediment, are then moved through the grid according to these properties. The spatial pattern of erosion is determined directly by the properties of the markers. The model allows two-dimensional spatial patterns of individual particle movement on a hillslope to be simulated within a computationally efficient framework. We have tested the model using data collected from a plot-scale, rainfall-simulation experiment. We measured the redistribution of137Cs-rich tracer soil to resolve the spatial patterns of erosion caused by a single, high-intensity, rainfall event. The model was able to recreate the key temporal and spatial aspects of the hydrology and hydraulics occurring on the plot, as well as the spatial redistribution of137Cs-rich tracer soil. The development of the model was used to probe our understanding of how to investigate soil-erosion processes. The lack of empirical underpinnings of the different model components highlighted the need to understand the spatiotemporal dynamics of soil erosion processes at the grain-scale so to provide a better process-based understanding of detachment and transport can be sought.