Prediction of hydrological drought using the GRI index and linear random time series models (Study area: Ardabil Plain aquifer)

Document Type : Research paper

Authors

1 Former MSc student, University of Tehran, Tehran, Iran.

2 Professor of Water Engineering Department, University of Tabriz, Tabriz, Iran.

3 Post Doctral student of Water Engineering Department, University of Tabriz, Tabriz, Iran.

10.22034/hydro.2025.64314.1321

Abstract

The study investigated hydrological droughts in the Ardabil plain aquifer. The monthly groundwater level observations in 48 wells in the statistical period of 2004–2021 were used for this aim. The Thiessen polygon approach was applied here to transform point data to the regional form. GRI indexes were computed in different time scales, which are 1, 3, 6, 9, and 12 months for regional groundwater level data. Then the GRI time series were modeled. Model performances were evaluated using the Nash-Sutcliffe (NS) and Akaike Information Criteria (AIC) to find the appropriate model. Based on observational data, the parameters of the models were evaluated. Drought was analyzed for each of the time series separately. To predict drought, the fitted model for each of the time series was used. Results showed that the longest drought period length in the three-month timeframe belonged to the period 2004 to 2007; however, it was in the period 2015 to 2021 using the 6-month time span. Using the GRI1 and GRI9 scales, the largest severity of wetness and drought spells were calculated to be about 1.87 and -3.21, respectively. Modeling of GRI time series showed that all-time series have a seasonal trend, and therefore, they were fitted using the SARIMA (p, d, q) (P, D, Q) model. Results revealed that SARIMA (5,1,0) (0,2,2) is the most appropriate model for the GRI3 series. Values of model performances of the mentioned model using the observed data were about NS=0.53 and AIC=-96.6. Therefore, it can be concluded that time series models have relatively suitable precision in predicting GRI series with different time windows in the Ardabil plain.

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Main Subjects


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