none 10.1190/INT-2024-0107.1 Society of Exploration Geophysicists Society of Exploration Geophysicists 186 168747434 226307 2025120914143679300 10.1190 2025-12-09T19:14:48Z 2024-12-12T08:06:33Z 2 Interpretation 2324-8858 2324-8866 01 08 2025 13 3 M. A. Benabdelkrim Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. mohammedelamin.benabdelkrim@univ-tlemcen.dz (corresponding author) Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. mohammedelamin.benabdelkrim@univ-tlemcen.dz (corresponding author) http://orcid.org/0009-0006-1553-8112 A. N. Ghenim Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. anghenim61@gmail.com Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. anghenim61@gmail.com http://orcid.org/0009-0004-7259-4159 A. Megnounif Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. megno-unif_aslam@yahoo.fr Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. megno-unif_aslam@yahoo.fr http://orcid.org/0000-0003-3386-5708 H. Abida University of Sfax 2 , GEOMODELE Laboratory, Faculty of Sciences, Sfax, Tunisia. habibabida62@gmail.com C. Abdelbaki Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. abdelbakicherifa@yahoo.fr Tlemcen University 1 , Department of Hydraulics, Faculty of Technology, Tlemcen, Algeria and , EOLE Laboratory, Tlemcen, Algeria. abdelbakicherifa@yahoo.fr http://orcid.org/0000-0002-7100-7467 O. Ghenim Mascara University 3 , Faculty of Science and Technology, Mascara, Algeria. omarghenim29@gmail.com http://orcid.org/0000-0002-0611-1786 S. Kantoush Kyoto University 4 , Disaster Prevention Research Institute (DPRI), Kyoto, Japan. kantoush.samehahmed.2n@kyoto-u.ac.jp http://orcid.org/0000-0003-0919-5097 M. Saber Kyoto University 4 , Disaster Prevention Research Institute (DPRI), Kyoto, Japan. mohamedmd.saber.3u@kyoto-u.ac.jp http://orcid.org/0000-0003-2420-8132 T. Sumi Kyoto University 4 , Disaster Prevention Research Institute (DPRI), Kyoto, Japan. sumi.tetsuya.2s@kyoto-u.ac.jp http://orcid.org/0000-0002-1423-7477 Abstract In semiarid climates, precipitation is the most important hydrometeorological event, as it remains the main source of water. In the context of climate change, the analysis of its spatio-temporal trends provides useful information for effective planning and management of water resources. Daily rainfall data collected from 12 meteorological stations in the downstream Mekkera Basin, Northwest Algeria, between 1975 and 2011 were analyzed using the innovative polygon trend analysis method. The analysis focused on trends in average monthly rainfall, average number of rainy days, average daily intensity, maximum daily rainfall, and maximum number of dry days per month. The results reveal a contrasting trend in monthly precipitation averages between dry and wet season months. Precipitation drops by 55 times during the spring months, with a significant decrease in February and March. In winter, there was a less noticeable decrease, though the intensity of maximum daily events increased. August and September show a significant increase in maximum daily precipitation across all stations, consistent with the overall 52 detected cases of increasing rainfall in the dry season. In addition, 70% of time series show that an increase in rainy days led to a decrease in the maximum number of dry days, whereas 52% of time series with fewer rainy days experienced more dry days. These findings offer crucial insights that can assist water managers in developing adaptive strategies to tackle the changing precipitation patterns in the region. 03 06 2025 01 08 2025 SB13 SB28 1 10.1190/crossmark-policy library.seg.org true 2024-07-07 2024-10-16 2024-11-04 2025-03-06 10.1190/INT-2024-0107.1 https://pubs.geoscienceworld.org/interpretation/article/13/3/SB13/653110/Innovative-polygon-trend-analysis-application-for https://pubs.geoscienceworld.org/seg/interpretation/article-pdf/13/3/SB13/7146745/int-2024-0107.1.pdf https://pubs.geoscienceworld.org/seg/interpretation/article-pdf/13/3/SB13/7146745/int-2024-0107.1.pdf https://pubs.geoscienceworld.org/interpretation/article/13/3/sb13/653110/innovative-polygon-trend-analysis-application-for Arabian Journal of Geosciences Achite 14 2021 10.1007/s12517-021-08221-w Analysis of temporal and spatial rainfall variability over the Wadi Sly basin, Algeria Sustainability Achite 13 2021 10.3390/su132212674 The innovative polygon trend 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