Scaling land surface parameters for global‐scale soil erosion estimation

Scaling land surface parameters for global‐scale soil erosion estimation
复制标题

缩放地表参数以进行全球范围的土壤侵蚀估算

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
J. Wainwright
J. Wainwright
中科院分区:
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文献类型:
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作者:
Xiaoyang Zhang;N. Drake;J. Wainwright

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许多环境模型在不同规模下应用时会提供不同的结果。开发了一种检测和克服这些结垢问题的方法,并将其应用于全球范围的土壤侵蚀模型。该方法涉及对土壤侵蚀模型进行尺度敏感性分析,以确定尺度问题的原因。为了克服这些问题,模型参数的多尺度数据集被用来开发统计和分形技术,以解释不同尺度下模型参数的空间变异性。这些缩放方法允许我们明确地使用缩放作为模型方程中的参数。当使用这些技术在全球范围内计算土壤侵蚀并使用现有数据进行验证时,通常会得到很好的一致性。
Many environmental models provide different results when applied at different scales. A methodology for detecting and overcoming these scaling problems is developed and applied to a global‐scale soil erosion model. The method involves applying a sensitivity analysis of the soil erosion model to scale in order to determine the causes of the scaling problems. To overcome these problems, multiple scale data sets of model parameters are used to develop statistical and fractal techniques that explain the spatial variability of model parameters at different scales. These scaling methods allow us to employ scale explicitly as a parameter in the model equations. When soil erosion is calculated at the global scale using these techniques and validated using available data, there is generally a good agreement.