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Monthly and Annual Precipitation in Arid Environment of the Daoura Watershed (South-Eastern Morocco) – Homogenization and Trend Analysis

Chanyour Yassine, El Achari Ouafaa, Hanchane Mohamed, Obda Khalid, Kessabi Ridouane

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 4

125--142

The high variability of the sub-desert climate, especially in the south-eastern region of Morocco, has severe socio-economic impacts on the inhabitant’s way of life, as is the case in the Daoura watershed, where this variability is associated with droughts or exceptional rainfall. The data collected from the Guir-Ziz-Rheriss hydraulic agency were processed, corrected and analyzed using the Climatol package (version 4.0.0) developed in R software to homogenize rainfall data. Through this work, the significance and amplitudes of annual and monthly rainfall trends were defined using the Mann-Kendall test and Sens’s slope estimator, while comparing the results of raw and homogenized data. The Daoura watershed has a sub-desert climate, and the homogenization process revealed a few rainfall stations with significant positive trends at confidence levels ranging from 90% to 95%. According to the raw and homogenized data, the majority of these stations are located in the High Atlas (CR1) and Anti-Atlasic (CR2) zones, where there is considerable spatiotemporal variability in rainfall from one year to the next. The essential objective of this scientific paper was to analyze the spatiotemporal variability of monthly and annual precipitation and to study their trends through rainfall data homogenized by the climatol package (version 4.0.0) from 13 stations over a period (1957–2018). The contribution of this study to science is the rainfall data it offers, which is useful for managing natural resources in sub-desert areas.