Study of the spatial and temporal variability of rainfall in the Middle and Lower Cheliff (Algeria)
2020
Abstract. The purpose of this study is to identify homogeneous
rainfall regions and to study the spatial and temporal variability of
rainfall in the Cheliff basin using the regional vector method and the
statistical approach (Pettitt test, Lee Heghinian test and Hubert
segmentation) and the geostatistic approach (inverse distance weighting
method). In terms of results, the regional vector method highlighted six
(6) homogeneous rainfall regions. The downward trend occurred in the study
area in 1972, affecting a few coastal stations. In 1976, this decline
extended to the South West and throughout the coastal region. In 1980, the
drop covered the entire basin. This decline has resulted in an estimated
deficit of 30 % on average in the eastern region, the coastal region and
the Mina. However, the central part of the basin experienced a 20 %
decrease compared to the period before the break (1968–1980). The same
spatial irregularity in rainfall was observed during the pre-break and
post-break periods (1981–2010). On the other hand, throughout the basin, the
areas corresponding to the rainfall ranges identified during the 1968–1980
period experienced an average decrease of 100 mm during the post-break
period, except in the eastern region, where the decrease exceeded 200 mm.
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