Spatio-temporal analysis of trends in annual maximum rainfall in the North-West of Algeria: Comparative analysis of recent and old non-parametric methods

Benali Benzater,Abdelkader Elouissi, Sahnoun Fellah, Anouar Hachemaoui

WATER AND ENVIRONMENT JOURNAL(2024)

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摘要
This article examines the spatial variability of extreme precipitation trends in northwestern Algeria (Macta) and compares the results obtained from the four recent and old non-parametric methods. A dataset of annual maximum precipitation consisting of 41 observation years (1970-2010) and 41 rain gauges was used. The results of the four old and new methods used to detect trends, Mann-Kendall (MK), Bravais-Pearson (BP), Spearman (SR) and innovative trend analysis (ITA), show good agreement. They revealed that a decrease in the trend of annual maximum precipitation was detected during the first period (1970-1992) with -44% (MK), -61% (BP), -68% (SR) and -76% (ITA). On the other hand, in the second period (1993-2010), a total shift occurred in which a significant increase in annual maximum precipitation trends was observed with +63% (BP), +34% (MK and SR) and +93% (ITA). These results show the ability of ITA to detect partial trends that the other three tests do not allow. Our results allow decision-makers to properly design adaptation strategies in the face of the intensification of these extreme events.
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关键词
annual maximum rainfall,Bravais-Pearson,ITA,Macta (Algeria),Mann-Kendall,Spearman
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