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On the spatial and temporal sampling of soil moisture fields
Author(s) -
Manfreda Salvatore,
RodríguezIturbe Ignacio
Publication year - 2006
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2005wr004548
Subject(s) - water content , sampling (signal processing) , environmental science , soil science , vegetation (pathology) , spatial variability , moisture , soil water , spatial heterogeneity , hydrology (agriculture) , spatial ecology , sampling design , mathematics , statistics , geology , geography , ecology , meteorology , computer science , geotechnical engineering , filter (signal processing) , computer vision , medicine , population , demography , pathology , sociology , biology
Recent work by Isham et al. and Rodrìguez‐Iturbe et al. has characterized the space‐time variability of soil moisture through its analytically derived covariance function which depends on soil properties, vegetation structure, and rainfall patterns typical of a region. This paper uses such characterization to address the strategies and methodologies for the sampling of soil moisture fields. The focus is on the estimation of the long‐term mean soil moisture and the daily soil moisture averaged over a given area as a function of the network geometry, number of stations, number of sampling days and landscape heterogeneity. It is found that the spatial geometry of the network has a significant impact on the sampling of the average soil moisture over an area in any particular day, while it is much less relevant for the sampling of the long‐term mean daily soil moisture over the region. In the latter case, the length of the record is a commanding factor in what concerns the variance of estimation, specially for soils with shallow rooted vegetation. Spatial vegetation heterogeneity plays an important role on the variance of estimation of the soil moisture, being particularly critical for the sampling of the average soil moisture over an area for a given day.