Published Paper Details:

The spatial and temporal study of periodic rainfall (month, quarter, semester and agricultural year) at the Tadla perimeter, a semi-arid climate zone in central Morocco, was based on data from 27 rainfall stations at 1958-2018 period, using Mann-Kendall test coupled with Sen's test and completed by Principal Component Analysis (PCA) method. The keys results of the study are that monthly rainfall varies in wide range from 4 to 44 mm/month, with a significant trend in nine out of twelve months of the agricultural year: The agricultural year ends in July and August with a stable monthly rainfall; impacting other periodicities given the significant downward trend in rainfall in the last three quarters of the agricultural year that are: December-January-February follow-up with March-April-May and June-July-August; in both wet semester (September-February) and dry (March-August) semester and also in the annual period.PCA method identifies seven variables of periodicity intra-annual with significant rainfall trends, distributed between two homogeneous geographical delimitations, defined by a grouping at the 13 sites of rainfall stations for variables following: monthly in December and April, quarterly in March-April-May and both semesters wet and dry and by versus other grouping at the 14 sites of stations for monthly variables months at September and at June.