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Spatiotemporal modeling and prediction of soil heavy metals based on spatiotemporal cokriging.

Abstract：

:Soil heavy metals exhibit significant spatiotemporal variability and are strongly correlated with other soil heavy metals. Thus, other heavy metals can be used to improve the accuracy of predictions when performing spatiotemporal predictions of soil heavy metals within a given area. In this study, we propose the spatiotemporal cokriging (STCK) method to enable the use of historical sampling points and co-variables in the spatial prediction of soil heavy metals. Moreover, experimental spatiotemporal (ST) semivariogram and ST cross-semivariogram computational methods, a fitting strategy to the ST semivariogram and ST cross-semivariogram models based on the Bilonick model, and the STCK interpolation algorithm are introduced; these methods are based on spatiotemporal kriging (STK) and cokriging (CK). The data used in this study consist of measurements of soil heavy metals from 2010 to 2014 in Wuhan City, China. The results show that the behavior of predictions of the concentrations of heavy metals in soils is physically more realistic, and the prediction uncertainties are slightly smaller, when STCK is used with greater numbers of co-variables and neighboring points.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhang B,Yang Y

doi

10.1038/s41598-017-17018-5

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

16750

issue

1

issn

2045-2322

pii

10.1038/s41598-017-17018-5

journal_volume

7

pub_type

杂志文章

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