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A combined geostatistical approach of data fusion and stochastic simulation for probabilistic assessment of shallow water table depth risk

Texto completo
Manzione, Rodrigo Lilla [1] ; Ferreira Silva, Cesar de Oliveira ; Castrignano, Annamaria
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] UNESP FCE, Tupa - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Science of The Total Environment; v. 765, APR 15 2021.
Citações Web of Science: 0

In general, water table depth risks are estimated from monitoring networks that mostly provide scarce and irregular data. When jointly analysed, environmental, agricultural and geotechnical variables, treated as stochastic spatial variables, can better describe and interpret the states of a certain system subject to estimation uncertainty. Risk assessment consists essentially in calculating the frequency (probability) with which specified criteria are exceeded or fail to be met by creating multiple stochastic realizations. The aim of this paper is to propose a novel geostatistical methodology, based on the integration into one approach of multi-source data fusion and stochastic simulation, to estimate the risk of extreme(shallow) water table depth, and illustrate a demonstrative example of application of the approach to a case study in a Cerrado conservation area in Brazil. The risk of shallow water table depth was determined by using critical thresholds for water table level and a binary transformation into an indicator variable depending on whether the conditions expressed by the threshold values are met or not. Firstly, auxiliary variables were jointly, analysed to provide a delineation of the study area into homogeneous zones. Secondly, sequential indicator simulation provided a-posteriori probabilities taking into account spatial proximity. The final maps show the most probable risk category for the whole area and spatial entropy as a measure of local uncertainty. Areas nearby watershed divisors and in the north part of the region have a high risk of shallow groundwater. Informed decision-making supported by probabilistic maps and uncertainty evaluation is essential for the success of the projects of Cerrado restoration. (C) 2020 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/04524-7 - Monitoramento de níveis freáticos no Sistema Aquífero Bauru em área de conservação em Águas de Santa Bárbara, SP
Beneficiário:Rodrigo Lilla Manzione
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 16/09737-4 - Modelagem da variabilidade espaço-temporal em águas subterrâneas a partir de dados de monitoramento de níveis freáticos utilizando funções de covariância
Beneficiário:Rodrigo Lilla Manzione
Modalidade de apoio: Auxílio à Pesquisa - Regular