Representation of space–time variability of soil moisture
Representation of space–time variability of soil moisture
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DOI：
10.1098/rspa.2005.1568
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
V. Isham;D. Cox;I. Rodríguez‐Iturbe;A. Porporato;S. Manfreda
中科院分区：
文献类型：
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作者：
V. Isham;D. Cox;I. Rodríguez‐Iturbe;A. Porporato;S. Manfreda
提出了一种基于随机降雨驱动的简化时空土壤湿度模型。该模型在数学上易于处理，并允许对降雨时空变异性和植被空间变异性引起的土壤水分场的时空结构进行分析探索。研究了反映雨细胞空间尺度、土壤储存量、降雨截留和土壤失水速率（代表蒸发和深入渗）的主要模型参数的影响。导出了土壤水分过程的空间平均变异性和时间和空间平均变异性。目前的分析侧重于空间均匀的植被条件；后续论文将纳入随机异质性植被。
A simplified spatial-temporal soil moisture model driven by stochastic spatial rainfall forcing is proposed. The model is mathematically tractable, and allows the spatial and temporal structure of soil moisture fields, induced by the spatial-temporal variability of rainfall and the spatial variability of vegetation, to be explored analytically. The influence of the main model parameters, reflecting the spatial scale of rain cells, the soil storage capacity, the rainfall interception and the soil water loss rate (representing evaporation and deep infiltration) is investigated. The variabilities of the spatially averaged soil moisture process, and that averaged in both space and time, are derived. The present analysis focuses on spatially uniform vegetation conditions; a follow-up paper will incorporate stochastically heterogeneous vegetation.