Open AccessGEOSTATISTICAL MODELING OF THE TEN-DAY RAINFALL IN MATO GROSSO STATE
Author(s) -
Vanessa Rakel de Moraes Dias,
Fernando da Silva Sallo,
Luciana Sanches,
Rivanildo Dallacort
Publication year - 2018
Publication title -
geografia
Language(s) - English
Resource type - Journals
eISSN - 1983-8700
pISSN - 0100-7912
DOI - 10.5016/geografia.v42i3.13092
Subject(s) - kriging , standard deviation , spatial variability , percentile , geostatistics , scale (ratio) , environmental science , statistics , variogram , gaussian , spatial dependence , mathematics , geography , cartography , physics , quantum mechanics
Mapping the spatial-temporal distribution of rainfall allows the analysis of tendencies and changes on local and regional scale, which is crucial for the development of environmental and agricultural projects. The objective of this paper is to adjust and choose semivariographic mathematical models to analyze the spatial variability of the 75 percentile rainfall in Mato Grosso State, covering October to March, to subsequently represent it on maps using Kriging techniques. Data from 155 weather stations in Mato Grosso S and around were used, with data for over ten years provided by the National Water Agency. The semivariograms were adjusted using the least squares method and chosen among spherical, exponential, and Gaussian models. The exponential model adjusted best to the experimental semivariograms using the criterion of standard deviation in reduced errors obtained from cross validation and level of dependence. The spatial variability of the rainfall was then mapped using Kriging techniques